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ultralytics.data.augment.BaseTransform

Classe de base pour les transformations d'images.

Il s'agit d'une classe de transformation générique qui peut être étendue pour répondre à des besoins spécifiques en matière de traitement d'images. La classe est conçue pour être compatible avec les tâches de classification et de segmentation sémantique.

MĂ©thodes :

Nom Description
__init__

Initialise l'objet BaseTransform.

apply_image

Applique la transformation de l'image aux Ă©tiquettes.

apply_instances

Applique des transformations aux instances d'objets dans les Ă©tiquettes.

apply_semantic

Applique la segmentation sémantique à une image.

__call__

Applique toutes les transformations d'étiquettes à une image, aux instances et aux masques sémantiques.

Code source dans ultralytics/data/augment.py
class BaseTransform:
    """
    Base class for image transformations.

    This is a generic transformation class that can be extended for specific image processing needs.
    The class is designed to be compatible with both classification and semantic segmentation tasks.

    Methods:
        __init__: Initializes the BaseTransform object.
        apply_image: Applies image transformation to labels.
        apply_instances: Applies transformations to object instances in labels.
        apply_semantic: Applies semantic segmentation to an image.
        __call__: Applies all label transformations to an image, instances, and semantic masks.
    """

    def __init__(self) -> None:
        """Initializes the BaseTransform object."""
        pass

    def apply_image(self, labels):
        """Applies image transformations to labels."""
        pass

    def apply_instances(self, labels):
        """Applies transformations to object instances in labels."""
        pass

    def apply_semantic(self, labels):
        """Applies semantic segmentation to an image."""
        pass

    def __call__(self, labels):
        """Applies all label transformations to an image, instances, and semantic masks."""
        self.apply_image(labels)
        self.apply_instances(labels)
        self.apply_semantic(labels)

__call__(labels)

Applique toutes les transformations d'étiquettes à une image, aux instances et aux masques sémantiques.

Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """Applies all label transformations to an image, instances, and semantic masks."""
    self.apply_image(labels)
    self.apply_instances(labels)
    self.apply_semantic(labels)

__init__()

Initialise l'objet BaseTransform.

Code source dans ultralytics/data/augment.py
def __init__(self) -> None:
    """Initializes the BaseTransform object."""
    pass

apply_image(labels)

Applique des transformations d'image aux Ă©tiquettes.

Code source dans ultralytics/data/augment.py
def apply_image(self, labels):
    """Applies image transformations to labels."""
    pass

apply_instances(labels)

Applique des transformations aux instances d'objets dans les Ă©tiquettes.

Code source dans ultralytics/data/augment.py
def apply_instances(self, labels):
    """Applies transformations to object instances in labels."""
    pass

apply_semantic(labels)

Applique la segmentation sémantique à une image.

Code source dans ultralytics/data/augment.py
def apply_semantic(self, labels):
    """Applies semantic segmentation to an image."""
    pass



ultralytics.data.augment.Compose

Classe permettant de composer plusieurs transformations d'images.

Code source dans ultralytics/data/augment.py
class Compose:
    """Class for composing multiple image transformations."""

    def __init__(self, transforms):
        """Initializes the Compose object with a list of transforms."""
        self.transforms = transforms if isinstance(transforms, list) else [transforms]

    def __call__(self, data):
        """Applies a series of transformations to input data."""
        for t in self.transforms:
            data = t(data)
        return data

    def append(self, transform):
        """Appends a new transform to the existing list of transforms."""
        self.transforms.append(transform)

    def insert(self, index, transform):
        """Inserts a new transform to the existing list of transforms."""
        self.transforms.insert(index, transform)

    def __getitem__(self, index: Union[list, int]) -> "Compose":
        """Retrieve a specific transform or a set of transforms using indexing."""
        assert isinstance(index, (int, list)), f"The indices should be either list or int type but got {type(index)}"
        index = [index] if isinstance(index, int) else index
        return Compose([self.transforms[i] for i in index])

    def __setitem__(self, index: Union[list, int], value: Union[list, int]) -> None:
        """Retrieve a specific transform or a set of transforms using indexing."""
        assert isinstance(index, (int, list)), f"The indices should be either list or int type but got {type(index)}"
        if isinstance(index, list):
            assert isinstance(
                value, list
            ), f"The indices should be the same type as values, but got {type(index)} and {type(value)}"
        if isinstance(index, int):
            index, value = [index], [value]
        for i, v in zip(index, value):
            assert i < len(self.transforms), f"list index {i} out of range {len(self.transforms)}."
            self.transforms[i] = v

    def tolist(self):
        """Converts the list of transforms to a standard Python list."""
        return self.transforms

    def __repr__(self):
        """Returns a string representation of the object."""
        return f"{self.__class__.__name__}({', '.join([f'{t}' for t in self.transforms])})"

__call__(data)

Applique une série de transformations aux données d'entrée.

Code source dans ultralytics/data/augment.py
def __call__(self, data):
    """Applies a series of transformations to input data."""
    for t in self.transforms:
        data = t(data)
    return data

__getitem__(index)

Récupère une transformation spécifique ou un ensemble de transformations en utilisant l'indexation.

Code source dans ultralytics/data/augment.py
def __getitem__(self, index: Union[list, int]) -> "Compose":
    """Retrieve a specific transform or a set of transforms using indexing."""
    assert isinstance(index, (int, list)), f"The indices should be either list or int type but got {type(index)}"
    index = [index] if isinstance(index, int) else index
    return Compose([self.transforms[i] for i in index])

__init__(transforms)

Initialise l'objet Compose avec une liste de transformations.

Code source dans ultralytics/data/augment.py
def __init__(self, transforms):
    """Initializes the Compose object with a list of transforms."""
    self.transforms = transforms if isinstance(transforms, list) else [transforms]

__repr__()

Renvoie une représentation sous forme de chaîne de caractères de l'objet.

Code source dans ultralytics/data/augment.py
def __repr__(self):
    """Returns a string representation of the object."""
    return f"{self.__class__.__name__}({', '.join([f'{t}' for t in self.transforms])})"

__setitem__(index, value)

Récupère une transformation spécifique ou un ensemble de transformations en utilisant l'indexation.

Code source dans ultralytics/data/augment.py
def __setitem__(self, index: Union[list, int], value: Union[list, int]) -> None:
    """Retrieve a specific transform or a set of transforms using indexing."""
    assert isinstance(index, (int, list)), f"The indices should be either list or int type but got {type(index)}"
    if isinstance(index, list):
        assert isinstance(
            value, list
        ), f"The indices should be the same type as values, but got {type(index)} and {type(value)}"
    if isinstance(index, int):
        index, value = [index], [value]
    for i, v in zip(index, value):
        assert i < len(self.transforms), f"list index {i} out of range {len(self.transforms)}."
        self.transforms[i] = v

append(transform)

Ajoute une nouvelle transformation Ă  la liste existante des transformations.

Code source dans ultralytics/data/augment.py
def append(self, transform):
    """Appends a new transform to the existing list of transforms."""
    self.transforms.append(transform)

insert(index, transform)

Insère une nouvelle transformation dans la liste existante des transformations.

Code source dans ultralytics/data/augment.py
def insert(self, index, transform):
    """Inserts a new transform to the existing list of transforms."""
    self.transforms.insert(index, transform)

tolist()

Convertit la liste des transformations en une liste standard Python .

Code source dans ultralytics/data/augment.py
def tolist(self):
    """Converts the list of transforms to a standard Python list."""
    return self.transforms



ultralytics.data.augment.BaseMixTransform

Classe pour les transformations de mélange de base (MixUp/Mosaic).

Cette mise en Ĺ“uvre provient de mmyolo.

Code source dans ultralytics/data/augment.py
class BaseMixTransform:
    """
    Class for base mix (MixUp/Mosaic) transformations.

    This implementation is from mmyolo.
    """

    def __init__(self, dataset, pre_transform=None, p=0.0) -> None:
        """Initializes the BaseMixTransform object with dataset, pre_transform, and probability."""
        self.dataset = dataset
        self.pre_transform = pre_transform
        self.p = p

    def __call__(self, labels):
        """Applies pre-processing transforms and mixup/mosaic transforms to labels data."""
        if random.uniform(0, 1) > self.p:
            return labels

        # Get index of one or three other images
        indexes = self.get_indexes()
        if isinstance(indexes, int):
            indexes = [indexes]

        # Get images information will be used for Mosaic or MixUp
        mix_labels = [self.dataset.get_image_and_label(i) for i in indexes]

        if self.pre_transform is not None:
            for i, data in enumerate(mix_labels):
                mix_labels[i] = self.pre_transform(data)
        labels["mix_labels"] = mix_labels

        # Update cls and texts
        labels = self._update_label_text(labels)
        # Mosaic or MixUp
        labels = self._mix_transform(labels)
        labels.pop("mix_labels", None)
        return labels

    def _mix_transform(self, labels):
        """Applies MixUp or Mosaic augmentation to the label dictionary."""
        raise NotImplementedError

    def get_indexes(self):
        """Gets a list of shuffled indexes for mosaic augmentation."""
        raise NotImplementedError

    def _update_label_text(self, labels):
        """Update label text."""
        if "texts" not in labels:
            return labels

        mix_texts = sum([labels["texts"]] + [x["texts"] for x in labels["mix_labels"]], [])
        mix_texts = list({tuple(x) for x in mix_texts})
        text2id = {text: i for i, text in enumerate(mix_texts)}

        for label in [labels] + labels["mix_labels"]:
            for i, cls in enumerate(label["cls"].squeeze(-1).tolist()):
                text = label["texts"][int(cls)]
                label["cls"][i] = text2id[tuple(text)]
            label["texts"] = mix_texts
        return labels

__call__(labels)

Applique les transformations de prétraitement et les transformations de mélange/mosaïque aux données des étiquettes.

Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """Applies pre-processing transforms and mixup/mosaic transforms to labels data."""
    if random.uniform(0, 1) > self.p:
        return labels

    # Get index of one or three other images
    indexes = self.get_indexes()
    if isinstance(indexes, int):
        indexes = [indexes]

    # Get images information will be used for Mosaic or MixUp
    mix_labels = [self.dataset.get_image_and_label(i) for i in indexes]

    if self.pre_transform is not None:
        for i, data in enumerate(mix_labels):
            mix_labels[i] = self.pre_transform(data)
    labels["mix_labels"] = mix_labels

    # Update cls and texts
    labels = self._update_label_text(labels)
    # Mosaic or MixUp
    labels = self._mix_transform(labels)
    labels.pop("mix_labels", None)
    return labels

__init__(dataset, pre_transform=None, p=0.0)

Initialise l'objet BaseMixTransform avec le jeu de données, la pré_transformation et la probabilité.

Code source dans ultralytics/data/augment.py
def __init__(self, dataset, pre_transform=None, p=0.0) -> None:
    """Initializes the BaseMixTransform object with dataset, pre_transform, and probability."""
    self.dataset = dataset
    self.pre_transform = pre_transform
    self.p = p

get_indexes()

Obtient une liste d'index mélangés pour l'augmentation de la mosaïque.

Code source dans ultralytics/data/augment.py
def get_indexes(self):
    """Gets a list of shuffled indexes for mosaic augmentation."""
    raise NotImplementedError



ultralytics.data.augment.Mosaic

Bases : BaseMixTransform

Augmentation de la mosaĂŻque.

Cette classe effectue une augmentation de mosaïque en combinant plusieurs (4 ou 9) images en une seule image mosaïque. L'augmentation est appliquée à un ensemble de données avec une probabilité donnée.

Attributs :

Nom Type Description
dataset

L'ensemble de données sur lequel l'augmentation de la mosaïque est appliquée.

imgsz int

Taille de l'image (hauteur et largeur) après le pipeline de mosaïque d'une seule image. La valeur par défaut est 640.

p float

Probabilité d'appliquer l'augmentation de la mosaïque. Doit être compris entre 0 et 1. La valeur par défaut est 1,0.

n int

La taille de la grille, soit 4 (pour 2x2) ou 9 (pour 3x3).

Code source dans ultralytics/data/augment.py
class Mosaic(BaseMixTransform):
    """
    Mosaic augmentation.

    This class performs mosaic augmentation by combining multiple (4 or 9) images into a single mosaic image.
    The augmentation is applied to a dataset with a given probability.

    Attributes:
        dataset: The dataset on which the mosaic augmentation is applied.
        imgsz (int, optional): Image size (height and width) after mosaic pipeline of a single image. Default to 640.
        p (float, optional): Probability of applying the mosaic augmentation. Must be in the range 0-1. Default to 1.0.
        n (int, optional): The grid size, either 4 (for 2x2) or 9 (for 3x3).
    """

    def __init__(self, dataset, imgsz=640, p=1.0, n=4):
        """Initializes the object with a dataset, image size, probability, and border."""
        assert 0 <= p <= 1.0, f"The probability should be in range [0, 1], but got {p}."
        assert n in {4, 9}, "grid must be equal to 4 or 9."
        super().__init__(dataset=dataset, p=p)
        self.dataset = dataset
        self.imgsz = imgsz
        self.border = (-imgsz // 2, -imgsz // 2)  # width, height
        self.n = n

    def get_indexes(self, buffer=True):
        """Return a list of random indexes from the dataset."""
        if buffer:  # select images from buffer
            return random.choices(list(self.dataset.buffer), k=self.n - 1)
        else:  # select any images
            return [random.randint(0, len(self.dataset) - 1) for _ in range(self.n - 1)]

    def _mix_transform(self, labels):
        """Apply mixup transformation to the input image and labels."""
        assert labels.get("rect_shape", None) is None, "rect and mosaic are mutually exclusive."
        assert len(labels.get("mix_labels", [])), "There are no other images for mosaic augment."
        return (
            self._mosaic3(labels) if self.n == 3 else self._mosaic4(labels) if self.n == 4 else self._mosaic9(labels)
        )  # This code is modified for mosaic3 method.

    def _mosaic3(self, labels):
        """Create a 1x3 image mosaic."""
        mosaic_labels = []
        s = self.imgsz
        for i in range(3):
            labels_patch = labels if i == 0 else labels["mix_labels"][i - 1]
            # Load image
            img = labels_patch["img"]
            h, w = labels_patch.pop("resized_shape")

            # Place img in img3
            if i == 0:  # center
                img3 = np.full((s * 3, s * 3, img.shape[2]), 114, dtype=np.uint8)  # base image with 3 tiles
                h0, w0 = h, w
                c = s, s, s + w, s + h  # xmin, ymin, xmax, ymax (base) coordinates
            elif i == 1:  # right
                c = s + w0, s, s + w0 + w, s + h
            elif i == 2:  # left
                c = s - w, s + h0 - h, s, s + h0

            padw, padh = c[:2]
            x1, y1, x2, y2 = (max(x, 0) for x in c)  # allocate coords

            img3[y1:y2, x1:x2] = img[y1 - padh :, x1 - padw :]  # img3[ymin:ymax, xmin:xmax]
            # hp, wp = h, w  # height, width previous for next iteration

            # Labels assuming imgsz*2 mosaic size
            labels_patch = self._update_labels(labels_patch, padw + self.border[0], padh + self.border[1])
            mosaic_labels.append(labels_patch)
        final_labels = self._cat_labels(mosaic_labels)

        final_labels["img"] = img3[-self.border[0] : self.border[0], -self.border[1] : self.border[1]]
        return final_labels

    def _mosaic4(self, labels):
        """Create a 2x2 image mosaic."""
        mosaic_labels = []
        s = self.imgsz
        yc, xc = (int(random.uniform(-x, 2 * s + x)) for x in self.border)  # mosaic center x, y
        for i in range(4):
            labels_patch = labels if i == 0 else labels["mix_labels"][i - 1]
            # Load image
            img = labels_patch["img"]
            h, w = labels_patch.pop("resized_shape")

            # Place img in img4
            if i == 0:  # top left
                img4 = np.full((s * 2, s * 2, img.shape[2]), 114, dtype=np.uint8)  # base image with 4 tiles
                x1a, y1a, x2a, y2a = max(xc - w, 0), max(yc - h, 0), xc, yc  # xmin, ymin, xmax, ymax (large image)
                x1b, y1b, x2b, y2b = w - (x2a - x1a), h - (y2a - y1a), w, h  # xmin, ymin, xmax, ymax (small image)
            elif i == 1:  # top right
                x1a, y1a, x2a, y2a = xc, max(yc - h, 0), min(xc + w, s * 2), yc
                x1b, y1b, x2b, y2b = 0, h - (y2a - y1a), min(w, x2a - x1a), h
            elif i == 2:  # bottom left
                x1a, y1a, x2a, y2a = max(xc - w, 0), yc, xc, min(s * 2, yc + h)
                x1b, y1b, x2b, y2b = w - (x2a - x1a), 0, w, min(y2a - y1a, h)
            elif i == 3:  # bottom right
                x1a, y1a, x2a, y2a = xc, yc, min(xc + w, s * 2), min(s * 2, yc + h)
                x1b, y1b, x2b, y2b = 0, 0, min(w, x2a - x1a), min(y2a - y1a, h)

            img4[y1a:y2a, x1a:x2a] = img[y1b:y2b, x1b:x2b]  # img4[ymin:ymax, xmin:xmax]
            padw = x1a - x1b
            padh = y1a - y1b

            labels_patch = self._update_labels(labels_patch, padw, padh)
            mosaic_labels.append(labels_patch)
        final_labels = self._cat_labels(mosaic_labels)
        final_labels["img"] = img4
        return final_labels

    def _mosaic9(self, labels):
        """Create a 3x3 image mosaic."""
        mosaic_labels = []
        s = self.imgsz
        hp, wp = -1, -1  # height, width previous
        for i in range(9):
            labels_patch = labels if i == 0 else labels["mix_labels"][i - 1]
            # Load image
            img = labels_patch["img"]
            h, w = labels_patch.pop("resized_shape")

            # Place img in img9
            if i == 0:  # center
                img9 = np.full((s * 3, s * 3, img.shape[2]), 114, dtype=np.uint8)  # base image with 4 tiles
                h0, w0 = h, w
                c = s, s, s + w, s + h  # xmin, ymin, xmax, ymax (base) coordinates
            elif i == 1:  # top
                c = s, s - h, s + w, s
            elif i == 2:  # top right
                c = s + wp, s - h, s + wp + w, s
            elif i == 3:  # right
                c = s + w0, s, s + w0 + w, s + h
            elif i == 4:  # bottom right
                c = s + w0, s + hp, s + w0 + w, s + hp + h
            elif i == 5:  # bottom
                c = s + w0 - w, s + h0, s + w0, s + h0 + h
            elif i == 6:  # bottom left
                c = s + w0 - wp - w, s + h0, s + w0 - wp, s + h0 + h
            elif i == 7:  # left
                c = s - w, s + h0 - h, s, s + h0
            elif i == 8:  # top left
                c = s - w, s + h0 - hp - h, s, s + h0 - hp

            padw, padh = c[:2]
            x1, y1, x2, y2 = (max(x, 0) for x in c)  # allocate coords

            # Image
            img9[y1:y2, x1:x2] = img[y1 - padh :, x1 - padw :]  # img9[ymin:ymax, xmin:xmax]
            hp, wp = h, w  # height, width previous for next iteration

            # Labels assuming imgsz*2 mosaic size
            labels_patch = self._update_labels(labels_patch, padw + self.border[0], padh + self.border[1])
            mosaic_labels.append(labels_patch)
        final_labels = self._cat_labels(mosaic_labels)

        final_labels["img"] = img9[-self.border[0] : self.border[0], -self.border[1] : self.border[1]]
        return final_labels

    @staticmethod
    def _update_labels(labels, padw, padh):
        """Update labels."""
        nh, nw = labels["img"].shape[:2]
        labels["instances"].convert_bbox(format="xyxy")
        labels["instances"].denormalize(nw, nh)
        labels["instances"].add_padding(padw, padh)
        return labels

    def _cat_labels(self, mosaic_labels):
        """Return labels with mosaic border instances clipped."""
        if len(mosaic_labels) == 0:
            return {}
        cls = []
        instances = []
        imgsz = self.imgsz * 2  # mosaic imgsz
        for labels in mosaic_labels:
            cls.append(labels["cls"])
            instances.append(labels["instances"])
        # Final labels
        final_labels = {
            "im_file": mosaic_labels[0]["im_file"],
            "ori_shape": mosaic_labels[0]["ori_shape"],
            "resized_shape": (imgsz, imgsz),
            "cls": np.concatenate(cls, 0),
            "instances": Instances.concatenate(instances, axis=0),
            "mosaic_border": self.border,
        }
        final_labels["instances"].clip(imgsz, imgsz)
        good = final_labels["instances"].remove_zero_area_boxes()
        final_labels["cls"] = final_labels["cls"][good]
        if "texts" in mosaic_labels[0]:
            final_labels["texts"] = mosaic_labels[0]["texts"]
        return final_labels

__init__(dataset, imgsz=640, p=1.0, n=4)

Initialise l'objet avec un jeu de données, la taille de l'image, la probabilité et la bordure.

Code source dans ultralytics/data/augment.py
def __init__(self, dataset, imgsz=640, p=1.0, n=4):
    """Initializes the object with a dataset, image size, probability, and border."""
    assert 0 <= p <= 1.0, f"The probability should be in range [0, 1], but got {p}."
    assert n in {4, 9}, "grid must be equal to 4 or 9."
    super().__init__(dataset=dataset, p=p)
    self.dataset = dataset
    self.imgsz = imgsz
    self.border = (-imgsz // 2, -imgsz // 2)  # width, height
    self.n = n

get_indexes(buffer=True)

Renvoie une liste d'index aléatoires de l'ensemble de données.

Code source dans ultralytics/data/augment.py
def get_indexes(self, buffer=True):
    """Return a list of random indexes from the dataset."""
    if buffer:  # select images from buffer
        return random.choices(list(self.dataset.buffer), k=self.n - 1)
    else:  # select any images
        return [random.randint(0, len(self.dataset) - 1) for _ in range(self.n - 1)]



ultralytics.data.augment.MixUp

Bases : BaseMixTransform

Classe permettant d'appliquer l'augmentation MixUp à l'ensemble de données.

Code source dans ultralytics/data/augment.py
class MixUp(BaseMixTransform):
    """Class for applying MixUp augmentation to the dataset."""

    def __init__(self, dataset, pre_transform=None, p=0.0) -> None:
        """Initializes MixUp object with dataset, pre_transform, and probability of applying MixUp."""
        super().__init__(dataset=dataset, pre_transform=pre_transform, p=p)

    def get_indexes(self):
        """Get a random index from the dataset."""
        return random.randint(0, len(self.dataset) - 1)

    def _mix_transform(self, labels):
        """Applies MixUp augmentation as per https://arxiv.org/pdf/1710.09412.pdf."""
        r = np.random.beta(32.0, 32.0)  # mixup ratio, alpha=beta=32.0
        labels2 = labels["mix_labels"][0]
        labels["img"] = (labels["img"] * r + labels2["img"] * (1 - r)).astype(np.uint8)
        labels["instances"] = Instances.concatenate([labels["instances"], labels2["instances"]], axis=0)
        labels["cls"] = np.concatenate([labels["cls"], labels2["cls"]], 0)
        return labels

__init__(dataset, pre_transform=None, p=0.0)

Initialise l'objet MixUp avec le jeu de données, la pré_transformation et la probabilité d'application du MixUp.

Code source dans ultralytics/data/augment.py
def __init__(self, dataset, pre_transform=None, p=0.0) -> None:
    """Initializes MixUp object with dataset, pre_transform, and probability of applying MixUp."""
    super().__init__(dataset=dataset, pre_transform=pre_transform, p=p)

get_indexes()

Obtiens un index aléatoire de l'ensemble de données.

Code source dans ultralytics/data/augment.py
def get_indexes(self):
    """Get a random index from the dataset."""
    return random.randint(0, len(self.dataset) - 1)



ultralytics.data.augment.RandomPerspective

Implémente des transformations aléatoires de perspective et d'affinité sur les images et les boîtes de délimitation, les segments et les points clés correspondants. points clés. Ces transformations comprennent la rotation, la translation, la mise à l'échelle et le cisaillement. La classe offre également la possibilité l'option d'appliquer ces transformations de façon conditionnelle avec une probabilité spécifiée.

Attributs :

Nom Type Description
degrees float

Plage de degrés pour les rotations aléatoires.

translate float

Fraction de la largeur et de la hauteur totales pour une traduction aléatoire.

scale float

Intervalle de facteur d'Ă©chelle, par exemple, un facteur d'Ă©chelle de 0,1 permet un redimensionnement entre 90 % et 110 %.

shear float

Intensité du cisaillement (angle en degrés).

perspective float

Facteur de distorsion de la perspective.

border tuple

Tuple spécifiant la bordure de la mosaïque.

pre_transform callable

Une fonction/transformation à appliquer à l'image avant de commencer la transformation aléatoire.

MĂ©thodes :

Nom Description
affine_transform

Applique une série de transformations affines à l'image.

apply_bboxes

Transforme les boîtes de délimitation à l'aide de la matrice affine calculée.

apply_segments

Transforme les segments et génère de nouvelles boîtes de délimitation.

apply_keypoints

Transforme les points clés.

__call__

MĂ©thode principale pour appliquer des transformations Ă  la fois aux images et aux annotations correspondantes.

box_candidates

Filtre les boîtes de délimitation qui ne répondent pas à certains critères après la transformation.

Code source dans ultralytics/data/augment.py
class RandomPerspective:
    """
    Implements random perspective and affine transformations on images and corresponding bounding boxes, segments, and
    keypoints. These transformations include rotation, translation, scaling, and shearing. The class also offers the
    option to apply these transformations conditionally with a specified probability.

    Attributes:
        degrees (float): Degree range for random rotations.
        translate (float): Fraction of total width and height for random translation.
        scale (float): Scaling factor interval, e.g., a scale factor of 0.1 allows a resize between 90%-110%.
        shear (float): Shear intensity (angle in degrees).
        perspective (float): Perspective distortion factor.
        border (tuple): Tuple specifying mosaic border.
        pre_transform (callable): A function/transform to apply to the image before starting the random transformation.

    Methods:
        affine_transform(img, border): Applies a series of affine transformations to the image.
        apply_bboxes(bboxes, M): Transforms bounding boxes using the calculated affine matrix.
        apply_segments(segments, M): Transforms segments and generates new bounding boxes.
        apply_keypoints(keypoints, M): Transforms keypoints.
        __call__(labels): Main method to apply transformations to both images and their corresponding annotations.
        box_candidates(box1, box2): Filters out bounding boxes that don't meet certain criteria post-transformation.
    """

    def __init__(
        self, degrees=0.0, translate=0.1, scale=0.5, shear=0.0, perspective=0.0, border=(0, 0), pre_transform=None
    ):
        """Initializes RandomPerspective object with transformation parameters."""

        self.degrees = degrees
        self.translate = translate
        self.scale = scale
        self.shear = shear
        self.perspective = perspective
        self.border = border  # mosaic border
        self.pre_transform = pre_transform

    def affine_transform(self, img, border):
        """
        Applies a sequence of affine transformations centered around the image center.

        Args:
            img (ndarray): Input image.
            border (tuple): Border dimensions.

        Returns:
            img (ndarray): Transformed image.
            M (ndarray): Transformation matrix.
            s (float): Scale factor.
        """

        # Center
        C = np.eye(3, dtype=np.float32)

        C[0, 2] = -img.shape[1] / 2  # x translation (pixels)
        C[1, 2] = -img.shape[0] / 2  # y translation (pixels)

        # Perspective
        P = np.eye(3, dtype=np.float32)
        P[2, 0] = random.uniform(-self.perspective, self.perspective)  # x perspective (about y)
        P[2, 1] = random.uniform(-self.perspective, self.perspective)  # y perspective (about x)

        # Rotation and Scale
        R = np.eye(3, dtype=np.float32)
        a = random.uniform(-self.degrees, self.degrees)
        # a += random.choice([-180, -90, 0, 90])  # add 90deg rotations to small rotations
        s = random.uniform(1 - self.scale, 1 + self.scale)
        # s = 2 ** random.uniform(-scale, scale)
        R[:2] = cv2.getRotationMatrix2D(angle=a, center=(0, 0), scale=s)

        # Shear
        S = np.eye(3, dtype=np.float32)
        S[0, 1] = math.tan(random.uniform(-self.shear, self.shear) * math.pi / 180)  # x shear (deg)
        S[1, 0] = math.tan(random.uniform(-self.shear, self.shear) * math.pi / 180)  # y shear (deg)

        # Translation
        T = np.eye(3, dtype=np.float32)
        T[0, 2] = random.uniform(0.5 - self.translate, 0.5 + self.translate) * self.size[0]  # x translation (pixels)
        T[1, 2] = random.uniform(0.5 - self.translate, 0.5 + self.translate) * self.size[1]  # y translation (pixels)

        # Combined rotation matrix
        M = T @ S @ R @ P @ C  # order of operations (right to left) is IMPORTANT
        # Affine image
        if (border[0] != 0) or (border[1] != 0) or (M != np.eye(3)).any():  # image changed
            if self.perspective:
                img = cv2.warpPerspective(img, M, dsize=self.size, borderValue=(114, 114, 114))
            else:  # affine
                img = cv2.warpAffine(img, M[:2], dsize=self.size, borderValue=(114, 114, 114))
        return img, M, s

    def apply_bboxes(self, bboxes, M):
        """
        Apply affine to bboxes only.

        Args:
            bboxes (ndarray): list of bboxes, xyxy format, with shape (num_bboxes, 4).
            M (ndarray): affine matrix.

        Returns:
            new_bboxes (ndarray): bboxes after affine, [num_bboxes, 4].
        """
        n = len(bboxes)
        if n == 0:
            return bboxes

        xy = np.ones((n * 4, 3), dtype=bboxes.dtype)
        xy[:, :2] = bboxes[:, [0, 1, 2, 3, 0, 3, 2, 1]].reshape(n * 4, 2)  # x1y1, x2y2, x1y2, x2y1
        xy = xy @ M.T  # transform
        xy = (xy[:, :2] / xy[:, 2:3] if self.perspective else xy[:, :2]).reshape(n, 8)  # perspective rescale or affine

        # Create new boxes
        x = xy[:, [0, 2, 4, 6]]
        y = xy[:, [1, 3, 5, 7]]
        return np.concatenate((x.min(1), y.min(1), x.max(1), y.max(1)), dtype=bboxes.dtype).reshape(4, n).T

    def apply_segments(self, segments, M):
        """
        Apply affine to segments and generate new bboxes from segments.

        Args:
            segments (ndarray): list of segments, [num_samples, 500, 2].
            M (ndarray): affine matrix.

        Returns:
            new_segments (ndarray): list of segments after affine, [num_samples, 500, 2].
            new_bboxes (ndarray): bboxes after affine, [N, 4].
        """
        n, num = segments.shape[:2]
        if n == 0:
            return [], segments

        xy = np.ones((n * num, 3), dtype=segments.dtype)
        segments = segments.reshape(-1, 2)
        xy[:, :2] = segments
        xy = xy @ M.T  # transform
        xy = xy[:, :2] / xy[:, 2:3]
        segments = xy.reshape(n, -1, 2)
        bboxes = np.stack([segment2box(xy, self.size[0], self.size[1]) for xy in segments], 0)
        segments[..., 0] = segments[..., 0].clip(bboxes[:, 0:1], bboxes[:, 2:3])
        segments[..., 1] = segments[..., 1].clip(bboxes[:, 1:2], bboxes[:, 3:4])
        return bboxes, segments

    def apply_keypoints(self, keypoints, M):
        """
        Apply affine to keypoints.

        Args:
            keypoints (ndarray): keypoints, [N, 17, 3].
            M (ndarray): affine matrix.

        Returns:
            new_keypoints (ndarray): keypoints after affine, [N, 17, 3].
        """
        n, nkpt = keypoints.shape[:2]
        if n == 0:
            return keypoints
        xy = np.ones((n * nkpt, 3), dtype=keypoints.dtype)
        visible = keypoints[..., 2].reshape(n * nkpt, 1)
        xy[:, :2] = keypoints[..., :2].reshape(n * nkpt, 2)
        xy = xy @ M.T  # transform
        xy = xy[:, :2] / xy[:, 2:3]  # perspective rescale or affine
        out_mask = (xy[:, 0] < 0) | (xy[:, 1] < 0) | (xy[:, 0] > self.size[0]) | (xy[:, 1] > self.size[1])
        visible[out_mask] = 0
        return np.concatenate([xy, visible], axis=-1).reshape(n, nkpt, 3)

    def __call__(self, labels):
        """
        Affine images and targets.

        Args:
            labels (dict): a dict of `bboxes`, `segments`, `keypoints`.
        """
        if self.pre_transform and "mosaic_border" not in labels:
            labels = self.pre_transform(labels)
        labels.pop("ratio_pad", None)  # do not need ratio pad

        img = labels["img"]
        cls = labels["cls"]
        instances = labels.pop("instances")
        # Make sure the coord formats are right
        instances.convert_bbox(format="xyxy")
        instances.denormalize(*img.shape[:2][::-1])

        border = labels.pop("mosaic_border", self.border)
        self.size = img.shape[1] + border[1] * 2, img.shape[0] + border[0] * 2  # w, h
        # M is affine matrix
        # Scale for func:`box_candidates`
        img, M, scale = self.affine_transform(img, border)

        bboxes = self.apply_bboxes(instances.bboxes, M)

        segments = instances.segments
        keypoints = instances.keypoints
        # Update bboxes if there are segments.
        if len(segments):
            bboxes, segments = self.apply_segments(segments, M)

        if keypoints is not None:
            keypoints = self.apply_keypoints(keypoints, M)
        new_instances = Instances(bboxes, segments, keypoints, bbox_format="xyxy", normalized=False)
        # Clip
        new_instances.clip(*self.size)

        # Filter instances
        instances.scale(scale_w=scale, scale_h=scale, bbox_only=True)
        # Make the bboxes have the same scale with new_bboxes
        i = self.box_candidates(
            box1=instances.bboxes.T, box2=new_instances.bboxes.T, area_thr=0.01 if len(segments) else 0.10
        )
        labels["instances"] = new_instances[i]
        labels["cls"] = cls[i]
        labels["img"] = img
        labels["resized_shape"] = img.shape[:2]
        return labels

    def box_candidates(self, box1, box2, wh_thr=2, ar_thr=100, area_thr=0.1, eps=1e-16):
        """
        Compute box candidates based on a set of thresholds. This method compares the characteristics of the boxes
        before and after augmentation to decide whether a box is a candidate for further processing.

        Args:
            box1 (numpy.ndarray): The 4,n bounding box before augmentation, represented as [x1, y1, x2, y2].
            box2 (numpy.ndarray): The 4,n bounding box after augmentation, represented as [x1, y1, x2, y2].
            wh_thr (float, optional): The width and height threshold in pixels. Default is 2.
            ar_thr (float, optional): The aspect ratio threshold. Default is 100.
            area_thr (float, optional): The area ratio threshold. Default is 0.1.
            eps (float, optional): A small epsilon value to prevent division by zero. Default is 1e-16.

        Returns:
            (numpy.ndarray): A boolean array indicating which boxes are candidates based on the given thresholds.
        """
        w1, h1 = box1[2] - box1[0], box1[3] - box1[1]
        w2, h2 = box2[2] - box2[0], box2[3] - box2[1]
        ar = np.maximum(w2 / (h2 + eps), h2 / (w2 + eps))  # aspect ratio
        return (w2 > wh_thr) & (h2 > wh_thr) & (w2 * h2 / (w1 * h1 + eps) > area_thr) & (ar < ar_thr)  # candidates

__call__(labels)

Images et cibles affines.

Paramètres :

Nom Type Description DĂ©faut
labels dict

une dictée de bboxes, segments, keypoints.

requis
Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """
    Affine images and targets.

    Args:
        labels (dict): a dict of `bboxes`, `segments`, `keypoints`.
    """
    if self.pre_transform and "mosaic_border" not in labels:
        labels = self.pre_transform(labels)
    labels.pop("ratio_pad", None)  # do not need ratio pad

    img = labels["img"]
    cls = labels["cls"]
    instances = labels.pop("instances")
    # Make sure the coord formats are right
    instances.convert_bbox(format="xyxy")
    instances.denormalize(*img.shape[:2][::-1])

    border = labels.pop("mosaic_border", self.border)
    self.size = img.shape[1] + border[1] * 2, img.shape[0] + border[0] * 2  # w, h
    # M is affine matrix
    # Scale for func:`box_candidates`
    img, M, scale = self.affine_transform(img, border)

    bboxes = self.apply_bboxes(instances.bboxes, M)

    segments = instances.segments
    keypoints = instances.keypoints
    # Update bboxes if there are segments.
    if len(segments):
        bboxes, segments = self.apply_segments(segments, M)

    if keypoints is not None:
        keypoints = self.apply_keypoints(keypoints, M)
    new_instances = Instances(bboxes, segments, keypoints, bbox_format="xyxy", normalized=False)
    # Clip
    new_instances.clip(*self.size)

    # Filter instances
    instances.scale(scale_w=scale, scale_h=scale, bbox_only=True)
    # Make the bboxes have the same scale with new_bboxes
    i = self.box_candidates(
        box1=instances.bboxes.T, box2=new_instances.bboxes.T, area_thr=0.01 if len(segments) else 0.10
    )
    labels["instances"] = new_instances[i]
    labels["cls"] = cls[i]
    labels["img"] = img
    labels["resized_shape"] = img.shape[:2]
    return labels

__init__(degrees=0.0, translate=0.1, scale=0.5, shear=0.0, perspective=0.0, border=(0, 0), pre_transform=None)

Initialise l'objet RandomPerspective avec les paramètres de transformation.

Code source dans ultralytics/data/augment.py
def __init__(
    self, degrees=0.0, translate=0.1, scale=0.5, shear=0.0, perspective=0.0, border=(0, 0), pre_transform=None
):
    """Initializes RandomPerspective object with transformation parameters."""

    self.degrees = degrees
    self.translate = translate
    self.scale = scale
    self.shear = shear
    self.perspective = perspective
    self.border = border  # mosaic border
    self.pre_transform = pre_transform

affine_transform(img, border)

Applique une séquence de transformations affines centrées sur le centre de l'image.

Paramètres :

Nom Type Description DĂ©faut
img ndarray

Image d'entrée.

requis
border tuple

Dimensions de la bordure.

requis

Retourne :

Nom Type Description
img ndarray

Image transformée.

M ndarray

Matrice de transformation.

s float

Facteur d'Ă©chelle.

Code source dans ultralytics/data/augment.py
def affine_transform(self, img, border):
    """
    Applies a sequence of affine transformations centered around the image center.

    Args:
        img (ndarray): Input image.
        border (tuple): Border dimensions.

    Returns:
        img (ndarray): Transformed image.
        M (ndarray): Transformation matrix.
        s (float): Scale factor.
    """

    # Center
    C = np.eye(3, dtype=np.float32)

    C[0, 2] = -img.shape[1] / 2  # x translation (pixels)
    C[1, 2] = -img.shape[0] / 2  # y translation (pixels)

    # Perspective
    P = np.eye(3, dtype=np.float32)
    P[2, 0] = random.uniform(-self.perspective, self.perspective)  # x perspective (about y)
    P[2, 1] = random.uniform(-self.perspective, self.perspective)  # y perspective (about x)

    # Rotation and Scale
    R = np.eye(3, dtype=np.float32)
    a = random.uniform(-self.degrees, self.degrees)
    # a += random.choice([-180, -90, 0, 90])  # add 90deg rotations to small rotations
    s = random.uniform(1 - self.scale, 1 + self.scale)
    # s = 2 ** random.uniform(-scale, scale)
    R[:2] = cv2.getRotationMatrix2D(angle=a, center=(0, 0), scale=s)

    # Shear
    S = np.eye(3, dtype=np.float32)
    S[0, 1] = math.tan(random.uniform(-self.shear, self.shear) * math.pi / 180)  # x shear (deg)
    S[1, 0] = math.tan(random.uniform(-self.shear, self.shear) * math.pi / 180)  # y shear (deg)

    # Translation
    T = np.eye(3, dtype=np.float32)
    T[0, 2] = random.uniform(0.5 - self.translate, 0.5 + self.translate) * self.size[0]  # x translation (pixels)
    T[1, 2] = random.uniform(0.5 - self.translate, 0.5 + self.translate) * self.size[1]  # y translation (pixels)

    # Combined rotation matrix
    M = T @ S @ R @ P @ C  # order of operations (right to left) is IMPORTANT
    # Affine image
    if (border[0] != 0) or (border[1] != 0) or (M != np.eye(3)).any():  # image changed
        if self.perspective:
            img = cv2.warpPerspective(img, M, dsize=self.size, borderValue=(114, 114, 114))
        else:  # affine
            img = cv2.warpAffine(img, M[:2], dsize=self.size, borderValue=(114, 114, 114))
    return img, M, s

apply_bboxes(bboxes, M)

Applique l'affine aux bboxes uniquement.

Paramètres :

Nom Type Description DĂ©faut
bboxes ndarray

liste de bboxes, format xyxy, avec la forme (num_bboxes, 4).

requis
M ndarray

matrice affine.

requis

Retourne :

Nom Type Description
new_bboxes ndarray

bboxes après affine, [num_bboxes, 4].

Code source dans ultralytics/data/augment.py
def apply_bboxes(self, bboxes, M):
    """
    Apply affine to bboxes only.

    Args:
        bboxes (ndarray): list of bboxes, xyxy format, with shape (num_bboxes, 4).
        M (ndarray): affine matrix.

    Returns:
        new_bboxes (ndarray): bboxes after affine, [num_bboxes, 4].
    """
    n = len(bboxes)
    if n == 0:
        return bboxes

    xy = np.ones((n * 4, 3), dtype=bboxes.dtype)
    xy[:, :2] = bboxes[:, [0, 1, 2, 3, 0, 3, 2, 1]].reshape(n * 4, 2)  # x1y1, x2y2, x1y2, x2y1
    xy = xy @ M.T  # transform
    xy = (xy[:, :2] / xy[:, 2:3] if self.perspective else xy[:, :2]).reshape(n, 8)  # perspective rescale or affine

    # Create new boxes
    x = xy[:, [0, 2, 4, 6]]
    y = xy[:, [1, 3, 5, 7]]
    return np.concatenate((x.min(1), y.min(1), x.max(1), y.max(1)), dtype=bboxes.dtype).reshape(4, n).T

apply_keypoints(keypoints, M)

Applique l'affine aux points clés.

Paramètres :

Nom Type Description DĂ©faut
keypoints ndarray

points clés, [N, 17, 3].

requis
M ndarray

matrice affine.

requis

Retourne :

Nom Type Description
new_keypoints ndarray

points clés après affine, [N, 17, 3].

Code source dans ultralytics/data/augment.py
def apply_keypoints(self, keypoints, M):
    """
    Apply affine to keypoints.

    Args:
        keypoints (ndarray): keypoints, [N, 17, 3].
        M (ndarray): affine matrix.

    Returns:
        new_keypoints (ndarray): keypoints after affine, [N, 17, 3].
    """
    n, nkpt = keypoints.shape[:2]
    if n == 0:
        return keypoints
    xy = np.ones((n * nkpt, 3), dtype=keypoints.dtype)
    visible = keypoints[..., 2].reshape(n * nkpt, 1)
    xy[:, :2] = keypoints[..., :2].reshape(n * nkpt, 2)
    xy = xy @ M.T  # transform
    xy = xy[:, :2] / xy[:, 2:3]  # perspective rescale or affine
    out_mask = (xy[:, 0] < 0) | (xy[:, 1] < 0) | (xy[:, 0] > self.size[0]) | (xy[:, 1] > self.size[1])
    visible[out_mask] = 0
    return np.concatenate([xy, visible], axis=-1).reshape(n, nkpt, 3)

apply_segments(segments, M)

Applique l'affine aux segments et génère de nouvelles bboxes à partir des segments.

Paramètres :

Nom Type Description DĂ©faut
segments ndarray

liste de segments, [num_samples, 500, 2].

requis
M ndarray

matrice affine.

requis

Retourne :

Nom Type Description
new_segments ndarray

liste des segments après affine, [num_samples, 500, 2].

new_bboxes ndarray

bboxes après affine, [N, 4].

Code source dans ultralytics/data/augment.py
def apply_segments(self, segments, M):
    """
    Apply affine to segments and generate new bboxes from segments.

    Args:
        segments (ndarray): list of segments, [num_samples, 500, 2].
        M (ndarray): affine matrix.

    Returns:
        new_segments (ndarray): list of segments after affine, [num_samples, 500, 2].
        new_bboxes (ndarray): bboxes after affine, [N, 4].
    """
    n, num = segments.shape[:2]
    if n == 0:
        return [], segments

    xy = np.ones((n * num, 3), dtype=segments.dtype)
    segments = segments.reshape(-1, 2)
    xy[:, :2] = segments
    xy = xy @ M.T  # transform
    xy = xy[:, :2] / xy[:, 2:3]
    segments = xy.reshape(n, -1, 2)
    bboxes = np.stack([segment2box(xy, self.size[0], self.size[1]) for xy in segments], 0)
    segments[..., 0] = segments[..., 0].clip(bboxes[:, 0:1], bboxes[:, 2:3])
    segments[..., 1] = segments[..., 1].clip(bboxes[:, 1:2], bboxes[:, 3:4])
    return bboxes, segments

box_candidates(box1, box2, wh_thr=2, ar_thr=100, area_thr=0.1, eps=1e-16)

Calcule les boîtes candidates en fonction d'un ensemble de seuils. Cette méthode compare les caractéristiques des boîtes avant et après l'augmentation pour décider si une boîte est candidate à un traitement ultérieur.

Paramètres :

Nom Type Description DĂ©faut
box1 ndarray

La boîte englobante 4,n avant l'augmentation, représentée par [x1, y1, x2, y2].

requis
box2 ndarray

La boîte englobante 4,n après l'augmentation, représentée par [x1, y1, x2, y2].

requis
wh_thr float

Le seuil de largeur et de hauteur en pixels. La valeur par défaut est 2.

2
ar_thr float

Le seuil du rapport d'aspect. La valeur par défaut est 100.

100
area_thr float

Le seuil du rapport de surface. La valeur par défaut est 0,1.

0.1
eps float

Une petite valeur epsilon pour empêcher la division par zéro. La valeur par défaut est 1e-16.

1e-16

Retourne :

Type Description
ndarray

Un tableau booléen indiquant quelles cases sont candidates en fonction des seuils donnés.

Code source dans ultralytics/data/augment.py
def box_candidates(self, box1, box2, wh_thr=2, ar_thr=100, area_thr=0.1, eps=1e-16):
    """
    Compute box candidates based on a set of thresholds. This method compares the characteristics of the boxes
    before and after augmentation to decide whether a box is a candidate for further processing.

    Args:
        box1 (numpy.ndarray): The 4,n bounding box before augmentation, represented as [x1, y1, x2, y2].
        box2 (numpy.ndarray): The 4,n bounding box after augmentation, represented as [x1, y1, x2, y2].
        wh_thr (float, optional): The width and height threshold in pixels. Default is 2.
        ar_thr (float, optional): The aspect ratio threshold. Default is 100.
        area_thr (float, optional): The area ratio threshold. Default is 0.1.
        eps (float, optional): A small epsilon value to prevent division by zero. Default is 1e-16.

    Returns:
        (numpy.ndarray): A boolean array indicating which boxes are candidates based on the given thresholds.
    """
    w1, h1 = box1[2] - box1[0], box1[3] - box1[1]
    w2, h2 = box2[2] - box2[0], box2[3] - box2[1]
    ar = np.maximum(w2 / (h2 + eps), h2 / (w2 + eps))  # aspect ratio
    return (w2 > wh_thr) & (h2 > wh_thr) & (w2 * h2 / (w1 * h1 + eps) > area_thr) & (ar < ar_thr)  # candidates



ultralytics.data.augment.RandomHSV

Cette classe est chargée d'effectuer des ajustements aléatoires sur les canaux Teinte, Saturation et Valeur (HSV) d'une image. image.

Les ajustements sont aléatoires mais dans les limites fixées par hgain, sgain et vgain.

Code source dans ultralytics/data/augment.py
class RandomHSV:
    """
    This class is responsible for performing random adjustments to the Hue, Saturation, and Value (HSV) channels of an
    image.

    The adjustments are random but within limits set by hgain, sgain, and vgain.
    """

    def __init__(self, hgain=0.5, sgain=0.5, vgain=0.5) -> None:
        """
        Initialize RandomHSV class with gains for each HSV channel.

        Args:
            hgain (float, optional): Maximum variation for hue. Default is 0.5.
            sgain (float, optional): Maximum variation for saturation. Default is 0.5.
            vgain (float, optional): Maximum variation for value. Default is 0.5.
        """
        self.hgain = hgain
        self.sgain = sgain
        self.vgain = vgain

    def __call__(self, labels):
        """
        Applies random HSV augmentation to an image within the predefined limits.

        The modified image replaces the original image in the input 'labels' dict.
        """
        img = labels["img"]
        if self.hgain or self.sgain or self.vgain:
            r = np.random.uniform(-1, 1, 3) * [self.hgain, self.sgain, self.vgain] + 1  # random gains
            hue, sat, val = cv2.split(cv2.cvtColor(img, cv2.COLOR_BGR2HSV))
            dtype = img.dtype  # uint8

            x = np.arange(0, 256, dtype=r.dtype)
            lut_hue = ((x * r[0]) % 180).astype(dtype)
            lut_sat = np.clip(x * r[1], 0, 255).astype(dtype)
            lut_val = np.clip(x * r[2], 0, 255).astype(dtype)

            im_hsv = cv2.merge((cv2.LUT(hue, lut_hue), cv2.LUT(sat, lut_sat), cv2.LUT(val, lut_val)))
            cv2.cvtColor(im_hsv, cv2.COLOR_HSV2BGR, dst=img)  # no return needed
        return labels

__call__(labels)

Applique une augmentation HSV aléatoire à une image dans les limites prédéfinies.

L'image modifiée remplace l'image originale dans l'entrée "étiquettes".

Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """
    Applies random HSV augmentation to an image within the predefined limits.

    The modified image replaces the original image in the input 'labels' dict.
    """
    img = labels["img"]
    if self.hgain or self.sgain or self.vgain:
        r = np.random.uniform(-1, 1, 3) * [self.hgain, self.sgain, self.vgain] + 1  # random gains
        hue, sat, val = cv2.split(cv2.cvtColor(img, cv2.COLOR_BGR2HSV))
        dtype = img.dtype  # uint8

        x = np.arange(0, 256, dtype=r.dtype)
        lut_hue = ((x * r[0]) % 180).astype(dtype)
        lut_sat = np.clip(x * r[1], 0, 255).astype(dtype)
        lut_val = np.clip(x * r[2], 0, 255).astype(dtype)

        im_hsv = cv2.merge((cv2.LUT(hue, lut_hue), cv2.LUT(sat, lut_sat), cv2.LUT(val, lut_val)))
        cv2.cvtColor(im_hsv, cv2.COLOR_HSV2BGR, dst=img)  # no return needed
    return labels

__init__(hgain=0.5, sgain=0.5, vgain=0.5)

Initialise la classe RandomHSV avec des gains pour chaque canal HSV.

Paramètres :

Nom Type Description DĂ©faut
hgain float

Variation maximale pour la teinte. La valeur par défaut est 0,5.

0.5
sgain float

Variation maximale pour la saturation. La valeur par défaut est 0,5.

0.5
vgain float

Variation maximale de la valeur. La valeur par défaut est 0,5.

0.5
Code source dans ultralytics/data/augment.py
def __init__(self, hgain=0.5, sgain=0.5, vgain=0.5) -> None:
    """
    Initialize RandomHSV class with gains for each HSV channel.

    Args:
        hgain (float, optional): Maximum variation for hue. Default is 0.5.
        sgain (float, optional): Maximum variation for saturation. Default is 0.5.
        vgain (float, optional): Maximum variation for value. Default is 0.5.
    """
    self.hgain = hgain
    self.sgain = sgain
    self.vgain = vgain



ultralytics.data.augment.RandomFlip

Applique une inversion horizontale ou verticale aléatoire à une image avec une probabilité donnée.

Met également à jour toutes les instances (boîtes de délimitation, points clés, etc.) en conséquence.

Code source dans ultralytics/data/augment.py
class RandomFlip:
    """
    Applies a random horizontal or vertical flip to an image with a given probability.

    Also updates any instances (bounding boxes, keypoints, etc.) accordingly.
    """

    def __init__(self, p=0.5, direction="horizontal", flip_idx=None) -> None:
        """
        Initializes the RandomFlip class with probability and direction.

        Args:
            p (float, optional): The probability of applying the flip. Must be between 0 and 1. Default is 0.5.
            direction (str, optional): The direction to apply the flip. Must be 'horizontal' or 'vertical'.
                Default is 'horizontal'.
            flip_idx (array-like, optional): Index mapping for flipping keypoints, if any.
        """
        assert direction in {"horizontal", "vertical"}, f"Support direction `horizontal` or `vertical`, got {direction}"
        assert 0 <= p <= 1.0

        self.p = p
        self.direction = direction
        self.flip_idx = flip_idx

    def __call__(self, labels):
        """
        Applies random flip to an image and updates any instances like bounding boxes or keypoints accordingly.

        Args:
            labels (dict): A dictionary containing the keys 'img' and 'instances'. 'img' is the image to be flipped.
                           'instances' is an object containing bounding boxes and optionally keypoints.

        Returns:
            (dict): The same dict with the flipped image and updated instances under the 'img' and 'instances' keys.
        """
        img = labels["img"]
        instances = labels.pop("instances")
        instances.convert_bbox(format="xywh")
        h, w = img.shape[:2]
        h = 1 if instances.normalized else h
        w = 1 if instances.normalized else w

        # Flip up-down
        if self.direction == "vertical" and random.random() < self.p:
            img = np.flipud(img)
            instances.flipud(h)
        if self.direction == "horizontal" and random.random() < self.p:
            img = np.fliplr(img)
            instances.fliplr(w)
            # For keypoints
            if self.flip_idx is not None and instances.keypoints is not None:
                instances.keypoints = np.ascontiguousarray(instances.keypoints[:, self.flip_idx, :])
        labels["img"] = np.ascontiguousarray(img)
        labels["instances"] = instances
        return labels

__call__(labels)

Applique un retournement aléatoire à une image et met à jour toutes les instances comme les boîtes de délimitation ou les points clés en conséquence.

Paramètres :

Nom Type Description DĂ©faut
labels dict

Un dictionnaire contenant les clés 'img' et 'instances'. 'img' est l'image à retourner. 'instances' est un objet contenant des boîtes de délimitation et éventuellement des points clés.

requis

Retourne :

Type Description
dict

Même chose avec l'image retournée et les instances mises à jour sous les clés 'img' et 'instances'.

Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """
    Applies random flip to an image and updates any instances like bounding boxes or keypoints accordingly.

    Args:
        labels (dict): A dictionary containing the keys 'img' and 'instances'. 'img' is the image to be flipped.
                       'instances' is an object containing bounding boxes and optionally keypoints.

    Returns:
        (dict): The same dict with the flipped image and updated instances under the 'img' and 'instances' keys.
    """
    img = labels["img"]
    instances = labels.pop("instances")
    instances.convert_bbox(format="xywh")
    h, w = img.shape[:2]
    h = 1 if instances.normalized else h
    w = 1 if instances.normalized else w

    # Flip up-down
    if self.direction == "vertical" and random.random() < self.p:
        img = np.flipud(img)
        instances.flipud(h)
    if self.direction == "horizontal" and random.random() < self.p:
        img = np.fliplr(img)
        instances.fliplr(w)
        # For keypoints
        if self.flip_idx is not None and instances.keypoints is not None:
            instances.keypoints = np.ascontiguousarray(instances.keypoints[:, self.flip_idx, :])
    labels["img"] = np.ascontiguousarray(img)
    labels["instances"] = instances
    return labels

__init__(p=0.5, direction='horizontal', flip_idx=None)

Initialise la classe RandomFlip avec la probabilité et la direction.

Paramètres :

Nom Type Description DĂ©faut
p float

La probabilité d'appliquer l'inversion. Doit être comprise entre 0 et 1. La valeur par défaut est 0,5.

0.5
direction str

La direction dans laquelle le retournement doit être appliqué. Doit être "horizontal" ou "vertical". La valeur par défaut est "horizontal".

'horizontal'
flip_idx array - like

Mappage d'index pour l'inversion des points clés, s'il y en a.

None
Code source dans ultralytics/data/augment.py
def __init__(self, p=0.5, direction="horizontal", flip_idx=None) -> None:
    """
    Initializes the RandomFlip class with probability and direction.

    Args:
        p (float, optional): The probability of applying the flip. Must be between 0 and 1. Default is 0.5.
        direction (str, optional): The direction to apply the flip. Must be 'horizontal' or 'vertical'.
            Default is 'horizontal'.
        flip_idx (array-like, optional): Index mapping for flipping keypoints, if any.
    """
    assert direction in {"horizontal", "vertical"}, f"Support direction `horizontal` or `vertical`, got {direction}"
    assert 0 <= p <= 1.0

    self.p = p
    self.direction = direction
    self.flip_idx = flip_idx



ultralytics.data.augment.LetterBox

Redimensionne l'image et le padding pour la détection, la segmentation de l'instance, la pose.

Code source dans ultralytics/data/augment.py
class LetterBox:
    """Resize image and padding for detection, instance segmentation, pose."""

    def __init__(self, new_shape=(640, 640), auto=False, scaleFill=False, scaleup=True, center=True, stride=32):
        """Initialize LetterBox object with specific parameters."""
        self.new_shape = new_shape
        self.auto = auto
        self.scaleFill = scaleFill
        self.scaleup = scaleup
        self.stride = stride
        self.center = center  # Put the image in the middle or top-left

    def __call__(self, labels=None, image=None):
        """Return updated labels and image with added border."""
        if labels is None:
            labels = {}
        img = labels.get("img") if image is None else image
        shape = img.shape[:2]  # current shape [height, width]
        new_shape = labels.pop("rect_shape", self.new_shape)
        if isinstance(new_shape, int):
            new_shape = (new_shape, new_shape)

        # Scale ratio (new / old)
        r = min(new_shape[0] / shape[0], new_shape[1] / shape[1])
        if not self.scaleup:  # only scale down, do not scale up (for better val mAP)
            r = min(r, 1.0)

        # Compute padding
        ratio = r, r  # width, height ratios
        new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r))
        dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[1]  # wh padding
        if self.auto:  # minimum rectangle
            dw, dh = np.mod(dw, self.stride), np.mod(dh, self.stride)  # wh padding
        elif self.scaleFill:  # stretch
            dw, dh = 0.0, 0.0
            new_unpad = (new_shape[1], new_shape[0])
            ratio = new_shape[1] / shape[1], new_shape[0] / shape[0]  # width, height ratios

        if self.center:
            dw /= 2  # divide padding into 2 sides
            dh /= 2

        if shape[::-1] != new_unpad:  # resize
            img = cv2.resize(img, new_unpad, interpolation=cv2.INTER_LINEAR)
        top, bottom = int(round(dh - 0.1)) if self.center else 0, int(round(dh + 0.1))
        left, right = int(round(dw - 0.1)) if self.center else 0, int(round(dw + 0.1))
        img = cv2.copyMakeBorder(
            img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=(114, 114, 114)
        )  # add border
        if labels.get("ratio_pad"):
            labels["ratio_pad"] = (labels["ratio_pad"], (left, top))  # for evaluation

        if len(labels):
            labels = self._update_labels(labels, ratio, dw, dh)
            labels["img"] = img
            labels["resized_shape"] = new_shape
            return labels
        else:
            return img

    def _update_labels(self, labels, ratio, padw, padh):
        """Update labels."""
        labels["instances"].convert_bbox(format="xyxy")
        labels["instances"].denormalize(*labels["img"].shape[:2][::-1])
        labels["instances"].scale(*ratio)
        labels["instances"].add_padding(padw, padh)
        return labels

__call__(labels=None, image=None)

Retourne les étiquettes et l'image mises à jour avec la bordure ajoutée.

Code source dans ultralytics/data/augment.py
def __call__(self, labels=None, image=None):
    """Return updated labels and image with added border."""
    if labels is None:
        labels = {}
    img = labels.get("img") if image is None else image
    shape = img.shape[:2]  # current shape [height, width]
    new_shape = labels.pop("rect_shape", self.new_shape)
    if isinstance(new_shape, int):
        new_shape = (new_shape, new_shape)

    # Scale ratio (new / old)
    r = min(new_shape[0] / shape[0], new_shape[1] / shape[1])
    if not self.scaleup:  # only scale down, do not scale up (for better val mAP)
        r = min(r, 1.0)

    # Compute padding
    ratio = r, r  # width, height ratios
    new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r))
    dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[1]  # wh padding
    if self.auto:  # minimum rectangle
        dw, dh = np.mod(dw, self.stride), np.mod(dh, self.stride)  # wh padding
    elif self.scaleFill:  # stretch
        dw, dh = 0.0, 0.0
        new_unpad = (new_shape[1], new_shape[0])
        ratio = new_shape[1] / shape[1], new_shape[0] / shape[0]  # width, height ratios

    if self.center:
        dw /= 2  # divide padding into 2 sides
        dh /= 2

    if shape[::-1] != new_unpad:  # resize
        img = cv2.resize(img, new_unpad, interpolation=cv2.INTER_LINEAR)
    top, bottom = int(round(dh - 0.1)) if self.center else 0, int(round(dh + 0.1))
    left, right = int(round(dw - 0.1)) if self.center else 0, int(round(dw + 0.1))
    img = cv2.copyMakeBorder(
        img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=(114, 114, 114)
    )  # add border
    if labels.get("ratio_pad"):
        labels["ratio_pad"] = (labels["ratio_pad"], (left, top))  # for evaluation

    if len(labels):
        labels = self._update_labels(labels, ratio, dw, dh)
        labels["img"] = img
        labels["resized_shape"] = new_shape
        return labels
    else:
        return img

__init__(new_shape=(640, 640), auto=False, scaleFill=False, scaleup=True, center=True, stride=32)

Initialise l'objet LetterBox avec des paramètres spécifiques.

Code source dans ultralytics/data/augment.py
def __init__(self, new_shape=(640, 640), auto=False, scaleFill=False, scaleup=True, center=True, stride=32):
    """Initialize LetterBox object with specific parameters."""
    self.new_shape = new_shape
    self.auto = auto
    self.scaleFill = scaleFill
    self.scaleup = scaleup
    self.stride = stride
    self.center = center  # Put the image in the middle or top-left



ultralytics.data.augment.CopyPaste

Met en œuvre l'augmentation Copier-Coller telle qu'elle est décrite dans l'article https://arxiv.org/abs/2012.07177. Cette classe est responsable de l'application de l'augmentation Copy-Paste sur les images et leurs instances correspondantes.

Code source dans ultralytics/data/augment.py
class CopyPaste:
    """
    Implements the Copy-Paste augmentation as described in the paper https://arxiv.org/abs/2012.07177. This class is
    responsible for applying the Copy-Paste augmentation on images and their corresponding instances.
    """

    def __init__(self, p=0.5) -> None:
        """
        Initializes the CopyPaste class with a given probability.

        Args:
            p (float, optional): The probability of applying the Copy-Paste augmentation. Must be between 0 and 1.
                                 Default is 0.5.
        """
        self.p = p

    def __call__(self, labels):
        """
        Applies the Copy-Paste augmentation to the given image and instances.

        Args:
            labels (dict): A dictionary containing:
                           - 'img': The image to augment.
                           - 'cls': Class labels associated with the instances.
                           - 'instances': Object containing bounding boxes, and optionally, keypoints and segments.

        Returns:
            (dict): Dict with augmented image and updated instances under the 'img', 'cls', and 'instances' keys.

        Notes:
            1. Instances are expected to have 'segments' as one of their attributes for this augmentation to work.
            2. This method modifies the input dictionary 'labels' in place.
        """
        im = labels["img"]
        cls = labels["cls"]
        h, w = im.shape[:2]
        instances = labels.pop("instances")
        instances.convert_bbox(format="xyxy")
        instances.denormalize(w, h)
        if self.p and len(instances.segments):
            n = len(instances)
            _, w, _ = im.shape  # height, width, channels
            im_new = np.zeros(im.shape, np.uint8)

            # Calculate ioa first then select indexes randomly
            ins_flip = deepcopy(instances)
            ins_flip.fliplr(w)

            ioa = bbox_ioa(ins_flip.bboxes, instances.bboxes)  # intersection over area, (N, M)
            indexes = np.nonzero((ioa < 0.30).all(1))[0]  # (N, )
            n = len(indexes)
            for j in random.sample(list(indexes), k=round(self.p * n)):
                cls = np.concatenate((cls, cls[[j]]), axis=0)
                instances = Instances.concatenate((instances, ins_flip[[j]]), axis=0)
                cv2.drawContours(im_new, instances.segments[[j]].astype(np.int32), -1, (1, 1, 1), cv2.FILLED)

            result = cv2.flip(im, 1)  # augment segments (flip left-right)
            i = cv2.flip(im_new, 1).astype(bool)
            im[i] = result[i]

        labels["img"] = im
        labels["cls"] = cls
        labels["instances"] = instances
        return labels

__call__(labels)

Applique l'augmentation Copier-Coller à l'image et aux instances données.

Paramètres :

Nom Type Description DĂ©faut
labels dict

Un dictionnaire contenant : - 'img' : L'image à augmenter. - 'cls' : Les étiquettes de classe associées aux instances. - 'instances' : Objet contenant des boîtes de délimitation et, éventuellement, des points clés et des segments.

requis

Retourne :

Type Description
dict

Dict avec une image augmentée et des instances mises à jour sous les clés 'img', 'cls' et 'instances'.

Notes
  1. Les instances doivent avoir "segments" comme l'un de leurs attributs pour que cette augmentation fonctionne.
  2. Cette méthode modifie le dictionnaire d'entrée 'labels' en place.
Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """
    Applies the Copy-Paste augmentation to the given image and instances.

    Args:
        labels (dict): A dictionary containing:
                       - 'img': The image to augment.
                       - 'cls': Class labels associated with the instances.
                       - 'instances': Object containing bounding boxes, and optionally, keypoints and segments.

    Returns:
        (dict): Dict with augmented image and updated instances under the 'img', 'cls', and 'instances' keys.

    Notes:
        1. Instances are expected to have 'segments' as one of their attributes for this augmentation to work.
        2. This method modifies the input dictionary 'labels' in place.
    """
    im = labels["img"]
    cls = labels["cls"]
    h, w = im.shape[:2]
    instances = labels.pop("instances")
    instances.convert_bbox(format="xyxy")
    instances.denormalize(w, h)
    if self.p and len(instances.segments):
        n = len(instances)
        _, w, _ = im.shape  # height, width, channels
        im_new = np.zeros(im.shape, np.uint8)

        # Calculate ioa first then select indexes randomly
        ins_flip = deepcopy(instances)
        ins_flip.fliplr(w)

        ioa = bbox_ioa(ins_flip.bboxes, instances.bboxes)  # intersection over area, (N, M)
        indexes = np.nonzero((ioa < 0.30).all(1))[0]  # (N, )
        n = len(indexes)
        for j in random.sample(list(indexes), k=round(self.p * n)):
            cls = np.concatenate((cls, cls[[j]]), axis=0)
            instances = Instances.concatenate((instances, ins_flip[[j]]), axis=0)
            cv2.drawContours(im_new, instances.segments[[j]].astype(np.int32), -1, (1, 1, 1), cv2.FILLED)

        result = cv2.flip(im, 1)  # augment segments (flip left-right)
        i = cv2.flip(im_new, 1).astype(bool)
        im[i] = result[i]

    labels["img"] = im
    labels["cls"] = cls
    labels["instances"] = instances
    return labels

__init__(p=0.5)

Initialise la classe CopyPaste avec une probabilité donnée.

Paramètres :

Nom Type Description DĂ©faut
p float

La probabilité d'appliquer l'augmentation copier-coller. Doit être comprise entre 0 et 1. La valeur par défaut est 0,5.

0.5
Code source dans ultralytics/data/augment.py
def __init__(self, p=0.5) -> None:
    """
    Initializes the CopyPaste class with a given probability.

    Args:
        p (float, optional): The probability of applying the Copy-Paste augmentation. Must be between 0 and 1.
                             Default is 0.5.
    """
    self.p = p



ultralytics.data.augment.Albumentations

Albumentations transformations.

Facultatif, désinstalle le paquet pour le désactiver. Applique le flou, le flou médian, la conversion en niveaux de gris, l'égalisation adaptative limitée au contraste l'égalisation des histogrammes, la modification aléatoire de la luminosité et du contraste, RandomGamma et la réduction de la qualité de l'image par la compression. compression.

Code source dans ultralytics/data/augment.py
class Albumentations:
    """
    Albumentations transformations.

    Optional, uninstall package to disable. Applies Blur, Median Blur, convert to grayscale, Contrast Limited Adaptive
    Histogram Equalization, random change of brightness and contrast, RandomGamma and lowering of image quality by
    compression.
    """

    def __init__(self, p=1.0):
        """Initialize the transform object for YOLO bbox formatted params."""
        self.p = p
        self.transform = None
        prefix = colorstr("albumentations: ")

        try:
            import albumentations as A

            check_version(A.__version__, "1.0.3", hard=True)  # version requirement

            # List of possible spatial transforms
            spatial_transforms = {
                "Affine",
                "BBoxSafeRandomCrop",
                "CenterCrop",
                "CoarseDropout",
                "Crop",
                "CropAndPad",
                "CropNonEmptyMaskIfExists",
                "D4",
                "ElasticTransform",
                "Flip",
                "GridDistortion",
                "GridDropout",
                "HorizontalFlip",
                "Lambda",
                "LongestMaxSize",
                "MaskDropout",
                "MixUp",
                "Morphological",
                "NoOp",
                "OpticalDistortion",
                "PadIfNeeded",
                "Perspective",
                "PiecewiseAffine",
                "PixelDropout",
                "RandomCrop",
                "RandomCropFromBorders",
                "RandomGridShuffle",
                "RandomResizedCrop",
                "RandomRotate90",
                "RandomScale",
                "RandomSizedBBoxSafeCrop",
                "RandomSizedCrop",
                "Resize",
                "Rotate",
                "SafeRotate",
                "ShiftScaleRotate",
                "SmallestMaxSize",
                "Transpose",
                "VerticalFlip",
                "XYMasking",
            }  # from https://albumentations.ai/docs/getting_started/transforms_and_targets/#spatial-level-transforms

            # Transforms
            T = [
                A.Blur(p=0.01),
                A.MedianBlur(p=0.01),
                A.ToGray(p=0.01),
                A.CLAHE(p=0.01),
                A.RandomBrightnessContrast(p=0.0),
                A.RandomGamma(p=0.0),
                A.ImageCompression(quality_lower=75, p=0.0),
            ]

            # Compose transforms
            self.contains_spatial = any(transform.__class__.__name__ in spatial_transforms for transform in T)
            self.transform = (
                A.Compose(T, bbox_params=A.BboxParams(format="yolo", label_fields=["class_labels"]))
                if self.contains_spatial
                else A.Compose(T)
            )
            LOGGER.info(prefix + ", ".join(f"{x}".replace("always_apply=False, ", "") for x in T if x.p))
        except ImportError:  # package not installed, skip
            pass
        except Exception as e:
            LOGGER.info(f"{prefix}{e}")

    def __call__(self, labels):
        """Generates object detections and returns a dictionary with detection results."""
        if self.transform is None or random.random() > self.p:
            return labels

        if self.contains_spatial:
            cls = labels["cls"]
            if len(cls):
                im = labels["img"]
                labels["instances"].convert_bbox("xywh")
                labels["instances"].normalize(*im.shape[:2][::-1])
                bboxes = labels["instances"].bboxes
                # TODO: add supports of segments and keypoints
                new = self.transform(image=im, bboxes=bboxes, class_labels=cls)  # transformed
                if len(new["class_labels"]) > 0:  # skip update if no bbox in new im
                    labels["img"] = new["image"]
                    labels["cls"] = np.array(new["class_labels"])
                    bboxes = np.array(new["bboxes"], dtype=np.float32)
                labels["instances"].update(bboxes=bboxes)
        else:
            labels["img"] = self.transform(image=labels["img"])["image"]  # transformed

        return labels

__call__(labels)

Génère des détections d'objets et renvoie un dictionnaire avec les résultats de la détection.

Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """Generates object detections and returns a dictionary with detection results."""
    if self.transform is None or random.random() > self.p:
        return labels

    if self.contains_spatial:
        cls = labels["cls"]
        if len(cls):
            im = labels["img"]
            labels["instances"].convert_bbox("xywh")
            labels["instances"].normalize(*im.shape[:2][::-1])
            bboxes = labels["instances"].bboxes
            # TODO: add supports of segments and keypoints
            new = self.transform(image=im, bboxes=bboxes, class_labels=cls)  # transformed
            if len(new["class_labels"]) > 0:  # skip update if no bbox in new im
                labels["img"] = new["image"]
                labels["cls"] = np.array(new["class_labels"])
                bboxes = np.array(new["bboxes"], dtype=np.float32)
            labels["instances"].update(bboxes=bboxes)
    else:
        labels["img"] = self.transform(image=labels["img"])["image"]  # transformed

    return labels

__init__(p=1.0)

Initialise l'objet transform pour YOLO bbox formatted params.

Code source dans ultralytics/data/augment.py
def __init__(self, p=1.0):
    """Initialize the transform object for YOLO bbox formatted params."""
    self.p = p
    self.transform = None
    prefix = colorstr("albumentations: ")

    try:
        import albumentations as A

        check_version(A.__version__, "1.0.3", hard=True)  # version requirement

        # List of possible spatial transforms
        spatial_transforms = {
            "Affine",
            "BBoxSafeRandomCrop",
            "CenterCrop",
            "CoarseDropout",
            "Crop",
            "CropAndPad",
            "CropNonEmptyMaskIfExists",
            "D4",
            "ElasticTransform",
            "Flip",
            "GridDistortion",
            "GridDropout",
            "HorizontalFlip",
            "Lambda",
            "LongestMaxSize",
            "MaskDropout",
            "MixUp",
            "Morphological",
            "NoOp",
            "OpticalDistortion",
            "PadIfNeeded",
            "Perspective",
            "PiecewiseAffine",
            "PixelDropout",
            "RandomCrop",
            "RandomCropFromBorders",
            "RandomGridShuffle",
            "RandomResizedCrop",
            "RandomRotate90",
            "RandomScale",
            "RandomSizedBBoxSafeCrop",
            "RandomSizedCrop",
            "Resize",
            "Rotate",
            "SafeRotate",
            "ShiftScaleRotate",
            "SmallestMaxSize",
            "Transpose",
            "VerticalFlip",
            "XYMasking",
        }  # from https://albumentations.ai/docs/getting_started/transforms_and_targets/#spatial-level-transforms

        # Transforms
        T = [
            A.Blur(p=0.01),
            A.MedianBlur(p=0.01),
            A.ToGray(p=0.01),
            A.CLAHE(p=0.01),
            A.RandomBrightnessContrast(p=0.0),
            A.RandomGamma(p=0.0),
            A.ImageCompression(quality_lower=75, p=0.0),
        ]

        # Compose transforms
        self.contains_spatial = any(transform.__class__.__name__ in spatial_transforms for transform in T)
        self.transform = (
            A.Compose(T, bbox_params=A.BboxParams(format="yolo", label_fields=["class_labels"]))
            if self.contains_spatial
            else A.Compose(T)
        )
        LOGGER.info(prefix + ", ".join(f"{x}".replace("always_apply=False, ", "") for x in T if x.p))
    except ImportError:  # package not installed, skip
        pass
    except Exception as e:
        LOGGER.info(f"{prefix}{e}")



ultralytics.data.augment.Format

Formate les annotations d'images pour les tâches de détection d'objets, de segmentation d'instances et d'estimation de la pose. La classe standardise les annotations d'images et d'instances qui seront utilisées par la classe collate_fn dans PyTorch DataLoader.

Attributs :

Nom Type Description
bbox_format str

Format des boîtes de délimitation. La valeur par défaut est "xywh".

normalize bool

S'il faut normaliser les boîtes de délimitation. La valeur par défaut est True.

return_mask bool

Renvoie les masques d'instance pour la segmentation. La valeur par défaut est False.

return_keypoint bool

Retourne les points clés pour l'estimation de la pose. La valeur par défaut est False.

mask_ratio int

Taux de sous-échantillonnage pour les masques. La valeur par défaut est 4.

mask_overlap bool

Si les masques se chevauchent ou non. La valeur par défaut est True.

batch_idx bool

Conserver les index de lots. La valeur par défaut est True.

bgr float

La probabilité de renvoyer des images BGR. La valeur par défaut est 0,0.

Code source dans ultralytics/data/augment.py
class Format:
    """
    Formats image annotations for object detection, instance segmentation, and pose estimation tasks. The class
    standardizes the image and instance annotations to be used by the `collate_fn` in PyTorch DataLoader.

    Attributes:
        bbox_format (str): Format for bounding boxes. Default is 'xywh'.
        normalize (bool): Whether to normalize bounding boxes. Default is True.
        return_mask (bool): Return instance masks for segmentation. Default is False.
        return_keypoint (bool): Return keypoints for pose estimation. Default is False.
        mask_ratio (int): Downsample ratio for masks. Default is 4.
        mask_overlap (bool): Whether to overlap masks. Default is True.
        batch_idx (bool): Keep batch indexes. Default is True.
        bgr (float): The probability to return BGR images. Default is 0.0.
    """

    def __init__(
        self,
        bbox_format="xywh",
        normalize=True,
        return_mask=False,
        return_keypoint=False,
        return_obb=False,
        mask_ratio=4,
        mask_overlap=True,
        batch_idx=True,
        bgr=0.0,
    ):
        """Initializes the Format class with given parameters."""
        self.bbox_format = bbox_format
        self.normalize = normalize
        self.return_mask = return_mask  # set False when training detection only
        self.return_keypoint = return_keypoint
        self.return_obb = return_obb
        self.mask_ratio = mask_ratio
        self.mask_overlap = mask_overlap
        self.batch_idx = batch_idx  # keep the batch indexes
        self.bgr = bgr

    def __call__(self, labels):
        """Return formatted image, classes, bounding boxes & keypoints to be used by 'collate_fn'."""
        img = labels.pop("img")
        h, w = img.shape[:2]
        cls = labels.pop("cls")
        instances = labels.pop("instances")
        instances.convert_bbox(format=self.bbox_format)
        instances.denormalize(w, h)
        nl = len(instances)

        if self.return_mask:
            if nl:
                masks, instances, cls = self._format_segments(instances, cls, w, h)
                masks = torch.from_numpy(masks)
            else:
                masks = torch.zeros(
                    1 if self.mask_overlap else nl, img.shape[0] // self.mask_ratio, img.shape[1] // self.mask_ratio
                )
            labels["masks"] = masks
        labels["img"] = self._format_img(img)
        labels["cls"] = torch.from_numpy(cls) if nl else torch.zeros(nl)
        labels["bboxes"] = torch.from_numpy(instances.bboxes) if nl else torch.zeros((nl, 4))
        if self.return_keypoint:
            labels["keypoints"] = torch.from_numpy(instances.keypoints)
            if self.normalize:
                labels["keypoints"][..., 0] /= w
                labels["keypoints"][..., 1] /= h
        if self.return_obb:
            labels["bboxes"] = (
                xyxyxyxy2xywhr(torch.from_numpy(instances.segments)) if len(instances.segments) else torch.zeros((0, 5))
            )
        # NOTE: need to normalize obb in xywhr format for width-height consistency
        if self.normalize:
            labels["bboxes"][:, [0, 2]] /= w
            labels["bboxes"][:, [1, 3]] /= h
        # Then we can use collate_fn
        if self.batch_idx:
            labels["batch_idx"] = torch.zeros(nl)
        return labels

    def _format_img(self, img):
        """Format the image for YOLO from Numpy array to PyTorch tensor."""
        if len(img.shape) < 3:
            img = np.expand_dims(img, -1)
        img = img.transpose(2, 0, 1)
        img = np.ascontiguousarray(img[::-1] if random.uniform(0, 1) > self.bgr else img)
        img = torch.from_numpy(img)
        return img

    def _format_segments(self, instances, cls, w, h):
        """Convert polygon points to bitmap."""
        segments = instances.segments
        if self.mask_overlap:
            masks, sorted_idx = polygons2masks_overlap((h, w), segments, downsample_ratio=self.mask_ratio)
            masks = masks[None]  # (640, 640) -> (1, 640, 640)
            instances = instances[sorted_idx]
            cls = cls[sorted_idx]
        else:
            masks = polygons2masks((h, w), segments, color=1, downsample_ratio=self.mask_ratio)

        return masks, instances, cls

__call__(labels)

Retourne l'image formatée, les classes, les cadres et les points clés qui seront utilisés par 'collate_fn'.

Code source dans ultralytics/data/augment.py
def __call__(self, labels):
    """Return formatted image, classes, bounding boxes & keypoints to be used by 'collate_fn'."""
    img = labels.pop("img")
    h, w = img.shape[:2]
    cls = labels.pop("cls")
    instances = labels.pop("instances")
    instances.convert_bbox(format=self.bbox_format)
    instances.denormalize(w, h)
    nl = len(instances)

    if self.return_mask:
        if nl:
            masks, instances, cls = self._format_segments(instances, cls, w, h)
            masks = torch.from_numpy(masks)
        else:
            masks = torch.zeros(
                1 if self.mask_overlap else nl, img.shape[0] // self.mask_ratio, img.shape[1] // self.mask_ratio
            )
        labels["masks"] = masks
    labels["img"] = self._format_img(img)
    labels["cls"] = torch.from_numpy(cls) if nl else torch.zeros(nl)
    labels["bboxes"] = torch.from_numpy(instances.bboxes) if nl else torch.zeros((nl, 4))
    if self.return_keypoint:
        labels["keypoints"] = torch.from_numpy(instances.keypoints)
        if self.normalize:
            labels["keypoints"][..., 0] /= w
            labels["keypoints"][..., 1] /= h
    if self.return_obb:
        labels["bboxes"] = (
            xyxyxyxy2xywhr(torch.from_numpy(instances.segments)) if len(instances.segments) else torch.zeros((0, 5))
        )
    # NOTE: need to normalize obb in xywhr format for width-height consistency
    if self.normalize:
        labels["bboxes"][:, [0, 2]] /= w
        labels["bboxes"][:, [1, 3]] /= h
    # Then we can use collate_fn
    if self.batch_idx:
        labels["batch_idx"] = torch.zeros(nl)
    return labels

__init__(bbox_format='xywh', normalize=True, return_mask=False, return_keypoint=False, return_obb=False, mask_ratio=4, mask_overlap=True, batch_idx=True, bgr=0.0)

Initialise la classe Format avec les paramètres donnés.

Code source dans ultralytics/data/augment.py
def __init__(
    self,
    bbox_format="xywh",
    normalize=True,
    return_mask=False,
    return_keypoint=False,
    return_obb=False,
    mask_ratio=4,
    mask_overlap=True,
    batch_idx=True,
    bgr=0.0,
):
    """Initializes the Format class with given parameters."""
    self.bbox_format = bbox_format
    self.normalize = normalize
    self.return_mask = return_mask  # set False when training detection only
    self.return_keypoint = return_keypoint
    self.return_obb = return_obb
    self.mask_ratio = mask_ratio
    self.mask_overlap = mask_overlap
    self.batch_idx = batch_idx  # keep the batch indexes
    self.bgr = bgr



ultralytics.data.augment.RandomLoadText

Prélève au hasard des textes positifs et des textes négatifs et mets à jour les indices de classe en fonction du nombre d'échantillons.

Attributs :

Nom Type Description
prompt_format str

Format de l'invite. La valeur par défaut est '{}'.

neg_samples tuple[int]

Un ranger pour échantillonner de façon aléatoire les textes négatifs, Défaut est (80, 80).

max_samples int

Nombre maximum d'échantillons de texte différents dans une image. La valeur par défaut est de 80.

padding bool

Indique s'il faut remplir les textes jusqu'à max_samples. La valeur par défaut est False.

padding_value str

Le texte de remplissage. La valeur par défaut est "".

Code source dans ultralytics/data/augment.py
class RandomLoadText:
    """
    Randomly sample positive texts and negative texts and update the class indices accordingly to the number of samples.

    Attributes:
        prompt_format (str): Format for prompt. Default is '{}'.
        neg_samples (tuple[int]): A ranger to randomly sample negative texts, Default is (80, 80).
        max_samples (int): The max number of different text samples in one image, Default is 80.
        padding (bool): Whether to pad texts to max_samples. Default is False.
        padding_value (str): The padding text. Default is "".
    """

    def __init__(
        self,
        prompt_format: str = "{}",
        neg_samples: Tuple[int, int] = (80, 80),
        max_samples: int = 80,
        padding: bool = False,
        padding_value: str = "",
    ) -> None:
        """Initializes the RandomLoadText class with given parameters."""
        self.prompt_format = prompt_format
        self.neg_samples = neg_samples
        self.max_samples = max_samples
        self.padding = padding
        self.padding_value = padding_value

    def __call__(self, labels: dict) -> dict:
        """Return updated classes and texts."""
        assert "texts" in labels, "No texts found in labels."
        class_texts = labels["texts"]
        num_classes = len(class_texts)
        cls = np.asarray(labels.pop("cls"), dtype=int)
        pos_labels = np.unique(cls).tolist()

        if len(pos_labels) > self.max_samples:
            pos_labels = set(random.sample(pos_labels, k=self.max_samples))

        neg_samples = min(min(num_classes, self.max_samples) - len(pos_labels), random.randint(*self.neg_samples))
        neg_labels = [i for i in range(num_classes) if i not in pos_labels]
        neg_labels = random.sample(neg_labels, k=neg_samples)

        sampled_labels = pos_labels + neg_labels
        random.shuffle(sampled_labels)

        label2ids = {label: i for i, label in enumerate(sampled_labels)}
        valid_idx = np.zeros(len(labels["instances"]), dtype=bool)
        new_cls = []
        for i, label in enumerate(cls.squeeze(-1).tolist()):
            if label not in label2ids:
                continue
            valid_idx[i] = True
            new_cls.append([label2ids[label]])
        labels["instances"] = labels["instances"][valid_idx]
        labels["cls"] = np.array(new_cls)

        # Randomly select one prompt when there's more than one prompts
        texts = []
        for label in sampled_labels:
            prompts = class_texts[label]
            assert len(prompts) > 0
            prompt = self.prompt_format.format(prompts[random.randrange(len(prompts))])
            texts.append(prompt)

        if self.padding:
            valid_labels = len(pos_labels) + len(neg_labels)
            num_padding = self.max_samples - valid_labels
            if num_padding > 0:
                texts += [self.padding_value] * num_padding

        labels["texts"] = texts
        return labels

__call__(labels)

Retourne les cours et les textes mis Ă  jour.

Code source dans ultralytics/data/augment.py
def __call__(self, labels: dict) -> dict:
    """Return updated classes and texts."""
    assert "texts" in labels, "No texts found in labels."
    class_texts = labels["texts"]
    num_classes = len(class_texts)
    cls = np.asarray(labels.pop("cls"), dtype=int)
    pos_labels = np.unique(cls).tolist()

    if len(pos_labels) > self.max_samples:
        pos_labels = set(random.sample(pos_labels, k=self.max_samples))

    neg_samples = min(min(num_classes, self.max_samples) - len(pos_labels), random.randint(*self.neg_samples))
    neg_labels = [i for i in range(num_classes) if i not in pos_labels]
    neg_labels = random.sample(neg_labels, k=neg_samples)

    sampled_labels = pos_labels + neg_labels
    random.shuffle(sampled_labels)

    label2ids = {label: i for i, label in enumerate(sampled_labels)}
    valid_idx = np.zeros(len(labels["instances"]), dtype=bool)
    new_cls = []
    for i, label in enumerate(cls.squeeze(-1).tolist()):
        if label not in label2ids:
            continue
        valid_idx[i] = True
        new_cls.append([label2ids[label]])
    labels["instances"] = labels["instances"][valid_idx]
    labels["cls"] = np.array(new_cls)

    # Randomly select one prompt when there's more than one prompts
    texts = []
    for label in sampled_labels:
        prompts = class_texts[label]
        assert len(prompts) > 0
        prompt = self.prompt_format.format(prompts[random.randrange(len(prompts))])
        texts.append(prompt)

    if self.padding:
        valid_labels = len(pos_labels) + len(neg_labels)
        num_padding = self.max_samples - valid_labels
        if num_padding > 0:
            texts += [self.padding_value] * num_padding

    labels["texts"] = texts
    return labels

__init__(prompt_format='{}', neg_samples=(80, 80), max_samples=80, padding=False, padding_value='')

Initialise la classe RandomLoadText avec les paramètres donnés.

Code source dans ultralytics/data/augment.py
def __init__(
    self,
    prompt_format: str = "{}",
    neg_samples: Tuple[int, int] = (80, 80),
    max_samples: int = 80,
    padding: bool = False,
    padding_value: str = "",
) -> None:
    """Initializes the RandomLoadText class with given parameters."""
    self.prompt_format = prompt_format
    self.neg_samples = neg_samples
    self.max_samples = max_samples
    self.padding = padding
    self.padding_value = padding_value



ultralytics.data.augment.ClassifyLetterBox

YOLOv8 Classe LetterBox pour le prétraitement des images, conçue pour faire partie d'un pipeline de transformation, par ex, T.Compose([LetterBox(size), ToTensor()]).

Attributs :

Nom Type Description
h int

Hauteur cible de l'image.

w int

Largeur cible de l'image.

auto bool

Si True, le côté court est automatiquement résolu à l'aide de stride.

stride int

La valeur de l'échelle, utilisée lorsque 'auto' est True.

Code source dans ultralytics/data/augment.py
class ClassifyLetterBox:
    """
    YOLOv8 LetterBox class for image preprocessing, designed to be part of a transformation pipeline, e.g.,
    T.Compose([LetterBox(size), ToTensor()]).

    Attributes:
        h (int): Target height of the image.
        w (int): Target width of the image.
        auto (bool): If True, automatically solves for short side using stride.
        stride (int): The stride value, used when 'auto' is True.
    """

    def __init__(self, size=(640, 640), auto=False, stride=32):
        """
        Initializes the ClassifyLetterBox class with a target size, auto-flag, and stride.

        Args:
            size (Union[int, Tuple[int, int]]): The target dimensions (height, width) for the letterbox.
            auto (bool): If True, automatically calculates the short side based on stride.
            stride (int): The stride value, used when 'auto' is True.
        """
        super().__init__()
        self.h, self.w = (size, size) if isinstance(size, int) else size
        self.auto = auto  # pass max size integer, automatically solve for short side using stride
        self.stride = stride  # used with auto

    def __call__(self, im):
        """
        Resizes the image and pads it with a letterbox method.

        Args:
            im (numpy.ndarray): The input image as a numpy array of shape HWC.

        Returns:
            (numpy.ndarray): The letterboxed and resized image as a numpy array.
        """
        imh, imw = im.shape[:2]
        r = min(self.h / imh, self.w / imw)  # ratio of new/old dimensions
        h, w = round(imh * r), round(imw * r)  # resized image dimensions

        # Calculate padding dimensions
        hs, ws = (math.ceil(x / self.stride) * self.stride for x in (h, w)) if self.auto else (self.h, self.w)
        top, left = round((hs - h) / 2 - 0.1), round((ws - w) / 2 - 0.1)

        # Create padded image
        im_out = np.full((hs, ws, 3), 114, dtype=im.dtype)
        im_out[top : top + h, left : left + w] = cv2.resize(im, (w, h), interpolation=cv2.INTER_LINEAR)
        return im_out

__call__(im)

Redimensionne l'image et tamponne-la avec une méthode de boîte aux lettres.

Paramètres :

Nom Type Description DĂ©faut
im ndarray

L'image d'entrée sous la forme d'un tableau numpy de forme HWC.

requis

Retourne :

Type Description
ndarray

L'image letterboxée et redimensionnée sous forme de tableau numpy.

Code source dans ultralytics/data/augment.py
def __call__(self, im):
    """
    Resizes the image and pads it with a letterbox method.

    Args:
        im (numpy.ndarray): The input image as a numpy array of shape HWC.

    Returns:
        (numpy.ndarray): The letterboxed and resized image as a numpy array.
    """
    imh, imw = im.shape[:2]
    r = min(self.h / imh, self.w / imw)  # ratio of new/old dimensions
    h, w = round(imh * r), round(imw * r)  # resized image dimensions

    # Calculate padding dimensions
    hs, ws = (math.ceil(x / self.stride) * self.stride for x in (h, w)) if self.auto else (self.h, self.w)
    top, left = round((hs - h) / 2 - 0.1), round((ws - w) / 2 - 0.1)

    # Create padded image
    im_out = np.full((hs, ws, 3), 114, dtype=im.dtype)
    im_out[top : top + h, left : left + w] = cv2.resize(im, (w, h), interpolation=cv2.INTER_LINEAR)
    return im_out

__init__(size=(640, 640), auto=False, stride=32)

Initialise la classe ClassifyLetterBox avec une taille cible, un drapeau automatique et une Ă©chelle.

Paramètres :

Nom Type Description DĂ©faut
size Union[int, Tuple[int, int]]

Les dimensions cibles (hauteur, largeur) pour la boîte aux lettres.

(640, 640)
auto bool

Si True, calcule automatiquement le côté court en fonction de la foulée.

False
stride int

La valeur de l'échelle, utilisée lorsque 'auto' est True.

32
Code source dans ultralytics/data/augment.py
def __init__(self, size=(640, 640), auto=False, stride=32):
    """
    Initializes the ClassifyLetterBox class with a target size, auto-flag, and stride.

    Args:
        size (Union[int, Tuple[int, int]]): The target dimensions (height, width) for the letterbox.
        auto (bool): If True, automatically calculates the short side based on stride.
        stride (int): The stride value, used when 'auto' is True.
    """
    super().__init__()
    self.h, self.w = (size, size) if isinstance(size, int) else size
    self.auto = auto  # pass max size integer, automatically solve for short side using stride
    self.stride = stride  # used with auto



ultralytics.data.augment.CenterCrop

YOLOv8 Classe CenterCrop pour le prétraitement des images, conçue pour faire partie d'un pipeline de transformation, par ex, T.Compose([CenterCrop(size), ToTensor()]).

Code source dans ultralytics/data/augment.py
class CenterCrop:
    """YOLOv8 CenterCrop class for image preprocessing, designed to be part of a transformation pipeline, e.g.,
    T.Compose([CenterCrop(size), ToTensor()]).
    """

    def __init__(self, size=640):
        """Converts an image from numpy array to PyTorch tensor."""
        super().__init__()
        self.h, self.w = (size, size) if isinstance(size, int) else size

    def __call__(self, im):
        """
        Resizes and crops the center of the image using a letterbox method.

        Args:
            im (numpy.ndarray): The input image as a numpy array of shape HWC.

        Returns:
            (numpy.ndarray): The center-cropped and resized image as a numpy array.
        """
        imh, imw = im.shape[:2]
        m = min(imh, imw)  # min dimension
        top, left = (imh - m) // 2, (imw - m) // 2
        return cv2.resize(im[top : top + m, left : left + m], (self.w, self.h), interpolation=cv2.INTER_LINEAR)

__call__(im)

Redimensionne et recadre le centre de l'image en utilisant une méthode de boîte aux lettres.

Paramètres :

Nom Type Description DĂ©faut
im ndarray

L'image d'entrée sous la forme d'un tableau numpy de forme HWC.

requis

Retourne :

Type Description
ndarray

L'image recadrée au centre et redimensionnée sous forme de tableau numpy.

Code source dans ultralytics/data/augment.py
def __call__(self, im):
    """
    Resizes and crops the center of the image using a letterbox method.

    Args:
        im (numpy.ndarray): The input image as a numpy array of shape HWC.

    Returns:
        (numpy.ndarray): The center-cropped and resized image as a numpy array.
    """
    imh, imw = im.shape[:2]
    m = min(imh, imw)  # min dimension
    top, left = (imh - m) // 2, (imw - m) // 2
    return cv2.resize(im[top : top + m, left : left + m], (self.w, self.h), interpolation=cv2.INTER_LINEAR)

__init__(size=640)

Convertit une image d'un tableau numpy en PyTorch tensor .

Code source dans ultralytics/data/augment.py
def __init__(self, size=640):
    """Converts an image from numpy array to PyTorch tensor."""
    super().__init__()
    self.h, self.w = (size, size) if isinstance(size, int) else size



ultralytics.data.augment.ToTensor

YOLOv8 Classe ToTensor pour le prétraitement des images, c'est-à-dire T.Compose([LetterBox(size), ToTensor()]).

Code source dans ultralytics/data/augment.py
class ToTensor:
    """YOLOv8 ToTensor class for image preprocessing, i.e., T.Compose([LetterBox(size), ToTensor()])."""

    def __init__(self, half=False):
        """Initialize YOLOv8 ToTensor object with optional half-precision support."""
        super().__init__()
        self.half = half

    def __call__(self, im):
        """
        Transforms an image from a numpy array to a PyTorch tensor, applying optional half-precision and normalization.

        Args:
            im (numpy.ndarray): Input image as a numpy array with shape (H, W, C) in BGR order.

        Returns:
            (torch.Tensor): The transformed image as a PyTorch tensor in float32 or float16, normalized to [0, 1].
        """
        im = np.ascontiguousarray(im.transpose((2, 0, 1))[::-1])  # HWC to CHW -> BGR to RGB -> contiguous
        im = torch.from_numpy(im)  # to torch
        im = im.half() if self.half else im.float()  # uint8 to fp16/32
        im /= 255.0  # 0-255 to 0.0-1.0
        return im

__call__(im)

Transforme une image d'un tableau numpy en PyTorch tensor , en appliquant la demi-précision et la normalisation optionnelles.

Paramètres :

Nom Type Description DĂ©faut
im ndarray

Image d'entrée sous forme de tableau numpy avec la forme (H, W, C) dans l'ordre BGR.

requis

Retourne :

Type Description
Tensor

L'image transformée sous forme de PyTorch tensor en float32 ou float16, normalisée à [0, 1].

Code source dans ultralytics/data/augment.py
def __call__(self, im):
    """
    Transforms an image from a numpy array to a PyTorch tensor, applying optional half-precision and normalization.

    Args:
        im (numpy.ndarray): Input image as a numpy array with shape (H, W, C) in BGR order.

    Returns:
        (torch.Tensor): The transformed image as a PyTorch tensor in float32 or float16, normalized to [0, 1].
    """
    im = np.ascontiguousarray(im.transpose((2, 0, 1))[::-1])  # HWC to CHW -> BGR to RGB -> contiguous
    im = torch.from_numpy(im)  # to torch
    im = im.half() if self.half else im.float()  # uint8 to fp16/32
    im /= 255.0  # 0-255 to 0.0-1.0
    return im

__init__(half=False)

Initialise l'objet ToTensor de YOLOv8 avec la prise en charge optionnelle de la demi-précision.

Code source dans ultralytics/data/augment.py
def __init__(self, half=False):
    """Initialize YOLOv8 ToTensor object with optional half-precision support."""
    super().__init__()
    self.half = half



ultralytics.data.augment.v8_transforms(dataset, imgsz, hyp, stretch=False)

Convertis les images à une taille adaptée à l'entraînement sur YOLOv8 .

Code source dans ultralytics/data/augment.py
def v8_transforms(dataset, imgsz, hyp, stretch=False):
    """Convert images to a size suitable for YOLOv8 training."""
    pre_transform = Compose(
        [
            Mosaic(dataset, imgsz=imgsz, p=hyp.mosaic),
            CopyPaste(p=hyp.copy_paste),
            RandomPerspective(
                degrees=hyp.degrees,
                translate=hyp.translate,
                scale=hyp.scale,
                shear=hyp.shear,
                perspective=hyp.perspective,
                pre_transform=None if stretch else LetterBox(new_shape=(imgsz, imgsz)),
            ),
        ]
    )
    flip_idx = dataset.data.get("flip_idx", [])  # for keypoints augmentation
    if dataset.use_keypoints:
        kpt_shape = dataset.data.get("kpt_shape", None)
        if len(flip_idx) == 0 and hyp.fliplr > 0.0:
            hyp.fliplr = 0.0
            LOGGER.warning("WARNING ⚠️ No 'flip_idx' array defined in data.yaml, setting augmentation 'fliplr=0.0'")
        elif flip_idx and (len(flip_idx) != kpt_shape[0]):
            raise ValueError(f"data.yaml flip_idx={flip_idx} length must be equal to kpt_shape[0]={kpt_shape[0]}")

    return Compose(
        [
            pre_transform,
            MixUp(dataset, pre_transform=pre_transform, p=hyp.mixup),
            Albumentations(p=1.0),
            RandomHSV(hgain=hyp.hsv_h, sgain=hyp.hsv_s, vgain=hyp.hsv_v),
            RandomFlip(direction="vertical", p=hyp.flipud),
            RandomFlip(direction="horizontal", p=hyp.fliplr, flip_idx=flip_idx),
        ]
    )  # transforms



ultralytics.data.augment.classify_transforms(size=224, mean=DEFAULT_MEAN, std=DEFAULT_STD, interpolation=Image.BILINEAR, crop_fraction=DEFAULT_CROP_FRACTION)

Transformations de classification pour l'évaluation/l'inférence. Inspiré par timm/data/transforms_factory.py.

Paramètres :

Nom Type Description DĂ©faut
size int

taille de l'image

224
mean tuple

Valeurs moyennes des canaux RVB

DEFAULT_MEAN
std tuple

Valeurs std des canaux RVB

DEFAULT_STD
interpolation InterpolationMode

Mode d'interpolation. La valeur par défaut est T.InterpolationMode.BILINEAR.

BILINEAR
crop_fraction float

fraction de l'image à recadrer. la valeur par défaut est 1.0.

DEFAULT_CROP_FRACTION

Retourne :

Type Description
Compose

torchvision transforme

Code source dans ultralytics/data/augment.py
def classify_transforms(
    size=224,
    mean=DEFAULT_MEAN,
    std=DEFAULT_STD,
    interpolation=Image.BILINEAR,
    crop_fraction: float = DEFAULT_CROP_FRACTION,
):
    """
    Classification transforms for evaluation/inference. Inspired by timm/data/transforms_factory.py.

    Args:
        size (int): image size
        mean (tuple): mean values of RGB channels
        std (tuple): std values of RGB channels
        interpolation (T.InterpolationMode): interpolation mode. default is T.InterpolationMode.BILINEAR.
        crop_fraction (float): fraction of image to crop. default is 1.0.

    Returns:
        (T.Compose): torchvision transforms
    """
    import torchvision.transforms as T  # scope for faster 'import ultralytics'

    if isinstance(size, (tuple, list)):
        assert len(size) == 2
        scale_size = tuple(math.floor(x / crop_fraction) for x in size)
    else:
        scale_size = math.floor(size / crop_fraction)
        scale_size = (scale_size, scale_size)

    # Aspect ratio is preserved, crops center within image, no borders are added, image is lost
    if scale_size[0] == scale_size[1]:
        # Simple case, use torchvision built-in Resize with the shortest edge mode (scalar size arg)
        tfl = [T.Resize(scale_size[0], interpolation=interpolation)]
    else:
        # Resize the shortest edge to matching target dim for non-square target
        tfl = [T.Resize(scale_size)]
    tfl += [T.CenterCrop(size)]

    tfl += [
        T.ToTensor(),
        T.Normalize(
            mean=torch.tensor(mean),
            std=torch.tensor(std),
        ),
    ]

    return T.Compose(tfl)



ultralytics.data.augment.classify_augmentations(size=224, mean=DEFAULT_MEAN, std=DEFAULT_STD, scale=None, ratio=None, hflip=0.5, vflip=0.0, auto_augment=None, hsv_h=0.015, hsv_s=0.4, hsv_v=0.4, force_color_jitter=False, erasing=0.0, interpolation=Image.BILINEAR)

Transformations de classification avec augmentation pour la formation. Inspiré par timm/data/transforms_factory.py.

Paramètres :

Nom Type Description DĂ©faut
size int

taille de l'image

224
scale tuple

plage d'échelle de l'image. la valeur par défaut est (0.08, 1.0)

None
ratio tuple

plage de rapport d'aspect de l'image. la valeur par défaut est (3./4., 4./3.)

None
mean tuple

Valeurs moyennes des canaux RVB

DEFAULT_MEAN
std tuple

Valeurs std des canaux RVB

DEFAULT_STD
hflip float

probabilité d'un retournement horizontal

0.5
vflip float

probabilité de retournement vertical

0.0
auto_augment str

politique d'augmentation automatique. peut ĂŞtre 'randaugment', 'augmix', 'autoaugment' ou None.

None
hsv_h float

image Augmentation de la teinte HSV (fraction)

0.015
hsv_s float

image Augmentation de la saturation HSV (fraction)

0.4
hsv_v float

Augmentation de la valeur HSV de l'image (fraction)

0.4
force_color_jitter bool

force à appliquer la gigue de couleur même si l'augmentation automatique est activée

False
erasing float

probabilité d'effacement aléatoire

0.0
interpolation InterpolationMode

Mode d'interpolation. La valeur par défaut est T.InterpolationMode.BILINEAR.

BILINEAR

Retourne :

Type Description
Compose

torchvision transforme

Code source dans ultralytics/data/augment.py
def classify_augmentations(
    size=224,
    mean=DEFAULT_MEAN,
    std=DEFAULT_STD,
    scale=None,
    ratio=None,
    hflip=0.5,
    vflip=0.0,
    auto_augment=None,
    hsv_h=0.015,  # image HSV-Hue augmentation (fraction)
    hsv_s=0.4,  # image HSV-Saturation augmentation (fraction)
    hsv_v=0.4,  # image HSV-Value augmentation (fraction)
    force_color_jitter=False,
    erasing=0.0,
    interpolation=Image.BILINEAR,
):
    """
    Classification transforms with augmentation for training. Inspired by timm/data/transforms_factory.py.

    Args:
        size (int): image size
        scale (tuple): scale range of the image. default is (0.08, 1.0)
        ratio (tuple): aspect ratio range of the image. default is (3./4., 4./3.)
        mean (tuple): mean values of RGB channels
        std (tuple): std values of RGB channels
        hflip (float): probability of horizontal flip
        vflip (float): probability of vertical flip
        auto_augment (str): auto augmentation policy. can be 'randaugment', 'augmix', 'autoaugment' or None.
        hsv_h (float): image HSV-Hue augmentation (fraction)
        hsv_s (float): image HSV-Saturation augmentation (fraction)
        hsv_v (float): image HSV-Value augmentation (fraction)
        force_color_jitter (bool): force to apply color jitter even if auto augment is enabled
        erasing (float): probability of random erasing
        interpolation (T.InterpolationMode): interpolation mode. default is T.InterpolationMode.BILINEAR.

    Returns:
        (T.Compose): torchvision transforms
    """
    # Transforms to apply if Albumentations not installed
    import torchvision.transforms as T  # scope for faster 'import ultralytics'

    if not isinstance(size, int):
        raise TypeError(f"classify_transforms() size {size} must be integer, not (list, tuple)")
    scale = tuple(scale or (0.08, 1.0))  # default imagenet scale range
    ratio = tuple(ratio or (3.0 / 4.0, 4.0 / 3.0))  # default imagenet ratio range
    primary_tfl = [T.RandomResizedCrop(size, scale=scale, ratio=ratio, interpolation=interpolation)]
    if hflip > 0.0:
        primary_tfl += [T.RandomHorizontalFlip(p=hflip)]
    if vflip > 0.0:
        primary_tfl += [T.RandomVerticalFlip(p=vflip)]

    secondary_tfl = []
    disable_color_jitter = False
    if auto_augment:
        assert isinstance(auto_augment, str)
        # color jitter is typically disabled if AA/RA on,
        # this allows override without breaking old hparm cfgs
        disable_color_jitter = not force_color_jitter

        if auto_augment == "randaugment":
            if TORCHVISION_0_11:
                secondary_tfl += [T.RandAugment(interpolation=interpolation)]
            else:
                LOGGER.warning('"auto_augment=randaugment" requires torchvision >= 0.11.0. Disabling it.')

        elif auto_augment == "augmix":
            if TORCHVISION_0_13:
                secondary_tfl += [T.AugMix(interpolation=interpolation)]
            else:
                LOGGER.warning('"auto_augment=augmix" requires torchvision >= 0.13.0. Disabling it.')

        elif auto_augment == "autoaugment":
            if TORCHVISION_0_10:
                secondary_tfl += [T.AutoAugment(interpolation=interpolation)]
            else:
                LOGGER.warning('"auto_augment=autoaugment" requires torchvision >= 0.10.0. Disabling it.')

        else:
            raise ValueError(
                f'Invalid auto_augment policy: {auto_augment}. Should be one of "randaugment", '
                f'"augmix", "autoaugment" or None'
            )

    if not disable_color_jitter:
        secondary_tfl += [T.ColorJitter(brightness=hsv_v, contrast=hsv_v, saturation=hsv_s, hue=hsv_h)]

    final_tfl = [
        T.ToTensor(),
        T.Normalize(mean=torch.tensor(mean), std=torch.tensor(std)),
        T.RandomErasing(p=erasing, inplace=True),
    ]

    return T.Compose(primary_tfl + secondary_tfl + final_tfl)





Created 2023-11-12, Updated 2024-06-02
Authors: glenn-jocher (6), Burhan-Q (1), Laughing-q (1)