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ultralytics.data.converter.coco91_to_coco80_class()

Convertit les identifiants de classe COCO Ă  91 indices en identifiants de classe COCO Ă  80 indices.

Retourne :

Type Description
list

Une liste de 91 ID de classe où l'index représente l'ID de classe 80-index et la valeur est l'ID de classe 91-index correspondant. l'identifiant de classe correspondant à l'indice 91.

Code source dans ultralytics/data/converter.py
def coco91_to_coco80_class():
    """
    Converts 91-index COCO class IDs to 80-index COCO class IDs.

    Returns:
        (list): A list of 91 class IDs where the index represents the 80-index class ID and the value is the
            corresponding 91-index class ID.
    """
    return [
        0,
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        None,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        None,
        24,
        25,
        None,
        None,
        26,
        27,
        28,
        29,
        30,
        31,
        32,
        33,
        34,
        35,
        36,
        37,
        38,
        39,
        None,
        40,
        41,
        42,
        43,
        44,
        45,
        46,
        47,
        48,
        49,
        50,
        51,
        52,
        53,
        54,
        55,
        56,
        57,
        58,
        59,
        None,
        60,
        None,
        None,
        61,
        None,
        62,
        63,
        64,
        65,
        66,
        67,
        68,
        69,
        70,
        71,
        72,
        None,
        73,
        74,
        75,
        76,
        77,
        78,
        79,
        None,
    ]



ultralytics.data.converter.coco80_to_coco91_class()

Converts 80-index (val2014) to 91-index (paper).
For details see https://tech.amikelive.com/node-718/what-object-categories-labels-are-in-coco-dataset/.

Example:
    ```python
    import numpy as np

    a = np.loadtxt('data/coco.names', dtype='str', delimiter='

') b = np.loadtxt('data/coco_paper.names', dtype='str', delimiter=' ') x1 = [list(a[i] == b).index(True) + 1 for i in range(80)] # darknet to coco x2 = [list(b[i] == a).index(True) if any(b[i] == a) else None for i in range(91)] # coco vers darknet ```

Code source dans ultralytics/data/converter.py
def coco80_to_coco91_class():
    """
    Converts 80-index (val2014) to 91-index (paper).
    For details see https://tech.amikelive.com/node-718/what-object-categories-labels-are-in-coco-dataset/.

    Example:
        ```python
        import numpy as np

        a = np.loadtxt('data/coco.names', dtype='str', delimiter='\n')
        b = np.loadtxt('data/coco_paper.names', dtype='str', delimiter='\n')
        x1 = [list(a[i] == b).index(True) + 1 for i in range(80)]  # darknet to coco
        x2 = [list(b[i] == a).index(True) if any(b[i] == a) else None for i in range(91)]  # coco to darknet
        ```
    """
    return [
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        27,
        28,
        31,
        32,
        33,
        34,
        35,
        36,
        37,
        38,
        39,
        40,
        41,
        42,
        43,
        44,
        46,
        47,
        48,
        49,
        50,
        51,
        52,
        53,
        54,
        55,
        56,
        57,
        58,
        59,
        60,
        61,
        62,
        63,
        64,
        65,
        67,
        70,
        72,
        73,
        74,
        75,
        76,
        77,
        78,
        79,
        80,
        81,
        82,
        84,
        85,
        86,
        87,
        88,
        89,
        90,
    ]



ultralytics.data.converter.convert_coco(labels_dir='../coco/annotations/', save_dir='coco_converted/', use_segments=False, use_keypoints=False, cls91to80=True, lvis=False)

Convertit les annotations du jeu de données COCO en un format d'annotation YOLO adapté à la formation des modèles YOLO .

Paramètres :

Nom Type Description DĂ©faut
labels_dir str

Chemin d'accès au répertoire contenant les fichiers d'annotation du jeu de données COCO.

'../coco/annotations/'
save_dir str

Chemin d'accès au répertoire dans lequel enregistrer les résultats.

'coco_converted/'
use_segments bool

Indique s'il faut inclure les masques de segmentation dans la sortie.

False
use_keypoints bool

Indique s'il faut inclure les annotations des points clés dans le résultat.

False
cls91to80 bool

S'il faut faire correspondre les identifiants de classe 91 COCO aux identifiants de classe 80 COCO correspondants.

True
lvis bool

S'il faut convertir les données à la manière d'un jeu de données lvis.

False
Exemple
from ultralytics.data.converter import convert_coco

convert_coco('../datasets/coco/annotations/', use_segments=True, use_keypoints=False, cls91to80=True)
convert_coco('../datasets/lvis/annotations/', use_segments=True, use_keypoints=False, cls91to80=False, lvis=True)
Sortie

Génère des fichiers de sortie dans le répertoire de sortie spécifié.

Code source dans ultralytics/data/converter.py
def convert_coco(
    labels_dir="../coco/annotations/",
    save_dir="coco_converted/",
    use_segments=False,
    use_keypoints=False,
    cls91to80=True,
    lvis=False,
):
    """
    Converts COCO dataset annotations to a YOLO annotation format  suitable for training YOLO models.

    Args:
        labels_dir (str, optional): Path to directory containing COCO dataset annotation files.
        save_dir (str, optional): Path to directory to save results to.
        use_segments (bool, optional): Whether to include segmentation masks in the output.
        use_keypoints (bool, optional): Whether to include keypoint annotations in the output.
        cls91to80 (bool, optional): Whether to map 91 COCO class IDs to the corresponding 80 COCO class IDs.
        lvis (bool, optional): Whether to convert data in lvis dataset way.

    Example:
        ```python
        from ultralytics.data.converter import convert_coco

        convert_coco('../datasets/coco/annotations/', use_segments=True, use_keypoints=False, cls91to80=True)
        convert_coco('../datasets/lvis/annotations/', use_segments=True, use_keypoints=False, cls91to80=False, lvis=True)
        ```

    Output:
        Generates output files in the specified output directory.
    """

    # Create dataset directory
    save_dir = increment_path(save_dir)  # increment if save directory already exists
    for p in save_dir / "labels", save_dir / "images":
        p.mkdir(parents=True, exist_ok=True)  # make dir

    # Convert classes
    coco80 = coco91_to_coco80_class()

    # Import json
    for json_file in sorted(Path(labels_dir).resolve().glob("*.json")):
        lname = "" if lvis else json_file.stem.replace("instances_", "")
        fn = Path(save_dir) / "labels" / lname  # folder name
        fn.mkdir(parents=True, exist_ok=True)
        if lvis:
            # NOTE: create folders for both train and val in advance,
            # since LVIS val set contains images from COCO 2017 train in addition to the COCO 2017 val split.
            (fn / "train2017").mkdir(parents=True, exist_ok=True)
            (fn / "val2017").mkdir(parents=True, exist_ok=True)
        with open(json_file) as f:
            data = json.load(f)

        # Create image dict
        images = {f'{x["id"]:d}': x for x in data["images"]}
        # Create image-annotations dict
        imgToAnns = defaultdict(list)
        for ann in data["annotations"]:
            imgToAnns[ann["image_id"]].append(ann)

        image_txt = []
        # Write labels file
        for img_id, anns in TQDM(imgToAnns.items(), desc=f"Annotations {json_file}"):
            img = images[f"{img_id:d}"]
            h, w = img["height"], img["width"]
            f = str(Path(img["coco_url"]).relative_to("http://images.cocodataset.org")) if lvis else img["file_name"]
            if lvis:
                image_txt.append(str(Path("./images") / f))

            bboxes = []
            segments = []
            keypoints = []
            for ann in anns:
                if ann.get("iscrowd", False):
                    continue
                # The COCO box format is [top left x, top left y, width, height]
                box = np.array(ann["bbox"], dtype=np.float64)
                box[:2] += box[2:] / 2  # xy top-left corner to center
                box[[0, 2]] /= w  # normalize x
                box[[1, 3]] /= h  # normalize y
                if box[2] <= 0 or box[3] <= 0:  # if w <= 0 and h <= 0
                    continue

                cls = coco80[ann["category_id"] - 1] if cls91to80 else ann["category_id"] - 1  # class
                box = [cls] + box.tolist()
                if box not in bboxes:
                    bboxes.append(box)
                    if use_segments and ann.get("segmentation") is not None:
                        if len(ann["segmentation"]) == 0:
                            segments.append([])
                            continue
                        elif len(ann["segmentation"]) > 1:
                            s = merge_multi_segment(ann["segmentation"])
                            s = (np.concatenate(s, axis=0) / np.array([w, h])).reshape(-1).tolist()
                        else:
                            s = [j for i in ann["segmentation"] for j in i]  # all segments concatenated
                            s = (np.array(s).reshape(-1, 2) / np.array([w, h])).reshape(-1).tolist()
                        s = [cls] + s
                        segments.append(s)
                    if use_keypoints and ann.get("keypoints") is not None:
                        keypoints.append(
                            box + (np.array(ann["keypoints"]).reshape(-1, 3) / np.array([w, h, 1])).reshape(-1).tolist()
                        )

            # Write
            with open((fn / f).with_suffix(".txt"), "a") as file:
                for i in range(len(bboxes)):
                    if use_keypoints:
                        line = (*(keypoints[i]),)  # cls, box, keypoints
                    else:
                        line = (
                            *(segments[i] if use_segments and len(segments[i]) > 0 else bboxes[i]),
                        )  # cls, box or segments
                    file.write(("%g " * len(line)).rstrip() % line + "\n")

        if lvis:
            with open((Path(save_dir) / json_file.name.replace("lvis_v1_", "").replace(".json", ".txt")), "a") as f:
                for l in image_txt:
                    f.write(f"{l}\n")

    LOGGER.info(f"{'LVIS' if lvis else 'COCO'} data converted successfully.\nResults saved to {save_dir.resolve()}")



ultralytics.data.converter.convert_dota_to_yolo_obb(dota_root_path)

Convertit les annotations du jeu de données DOTA au format YOLO OBB (Oriented Bounding Box).

La fonction traite les images des dossiers 'train' et 'val' de l'ensemble de données DOTA. Pour chaque image, elle lit l'étiquette l'étiquette associée dans le répertoire original des étiquettes et écrit de nouvelles étiquettes au format YOLO OBB dans un nouveau répertoire.

Paramètres :

Nom Type Description DĂ©faut
dota_root_path str

Le chemin du répertoire racine de l'ensemble de données DOTA.

requis
Exemple
from ultralytics.data.converter import convert_dota_to_yolo_obb

convert_dota_to_yolo_obb('path/to/DOTA')
Notes

La structure de répertoire supposée pour l'ensemble de données DOTA :

- DOTA
    ├─ images
    │   ├─ train
    │   └─ val
    └─ labels
        ├─ train_original
        └─ val_original

Après l'exécution, la fonction organisera les étiquettes en :

- DOTA
    └─ labels
        ├─ train
        └─ val
Code source dans ultralytics/data/converter.py
def convert_dota_to_yolo_obb(dota_root_path: str):
    """
    Converts DOTA dataset annotations to YOLO OBB (Oriented Bounding Box) format.

    The function processes images in the 'train' and 'val' folders of the DOTA dataset. For each image, it reads the
    associated label from the original labels directory and writes new labels in YOLO OBB format to a new directory.

    Args:
        dota_root_path (str): The root directory path of the DOTA dataset.

    Example:
        ```python
        from ultralytics.data.converter import convert_dota_to_yolo_obb

        convert_dota_to_yolo_obb('path/to/DOTA')
        ```

    Notes:
        The directory structure assumed for the DOTA dataset:

            - DOTA
                ├─ images
                │   ├─ train
                │   └─ val
                └─ labels
                    ├─ train_original
                    └─ val_original

        After execution, the function will organize the labels into:

            - DOTA
                └─ labels
                    ├─ train
                    └─ val
    """
    dota_root_path = Path(dota_root_path)

    # Class names to indices mapping
    class_mapping = {
        "plane": 0,
        "ship": 1,
        "storage-tank": 2,
        "baseball-diamond": 3,
        "tennis-court": 4,
        "basketball-court": 5,
        "ground-track-field": 6,
        "harbor": 7,
        "bridge": 8,
        "large-vehicle": 9,
        "small-vehicle": 10,
        "helicopter": 11,
        "roundabout": 12,
        "soccer-ball-field": 13,
        "swimming-pool": 14,
        "container-crane": 15,
        "airport": 16,
        "helipad": 17,
    }

    def convert_label(image_name, image_width, image_height, orig_label_dir, save_dir):
        """Converts a single image's DOTA annotation to YOLO OBB format and saves it to a specified directory."""
        orig_label_path = orig_label_dir / f"{image_name}.txt"
        save_path = save_dir / f"{image_name}.txt"

        with orig_label_path.open("r") as f, save_path.open("w") as g:
            lines = f.readlines()
            for line in lines:
                parts = line.strip().split()
                if len(parts) < 9:
                    continue
                class_name = parts[8]
                class_idx = class_mapping[class_name]
                coords = [float(p) for p in parts[:8]]
                normalized_coords = [
                    coords[i] / image_width if i % 2 == 0 else coords[i] / image_height for i in range(8)
                ]
                formatted_coords = ["{:.6g}".format(coord) for coord in normalized_coords]
                g.write(f"{class_idx} {' '.join(formatted_coords)}\n")

    for phase in ["train", "val"]:
        image_dir = dota_root_path / "images" / phase
        orig_label_dir = dota_root_path / "labels" / f"{phase}_original"
        save_dir = dota_root_path / "labels" / phase

        save_dir.mkdir(parents=True, exist_ok=True)

        image_paths = list(image_dir.iterdir())
        for image_path in TQDM(image_paths, desc=f"Processing {phase} images"):
            if image_path.suffix != ".png":
                continue
            image_name_without_ext = image_path.stem
            img = cv2.imread(str(image_path))
            h, w = img.shape[:2]
            convert_label(image_name_without_ext, w, h, orig_label_dir, save_dir)



ultralytics.data.converter.min_index(arr1, arr2)

Trouve une paire d'index avec la distance la plus courte entre deux tableaux de points 2D.

Paramètres :

Nom Type Description DĂ©faut
arr1 ndarray

Un tableau NumPy de forme (N, 2) représentant N points 2D.

requis
arr2 ndarray

Un tableau NumPy de forme (M, 2) représentant M points 2D.

requis

Retourne :

Type Description
tuple

Un tuple contenant les index des points ayant la distance la plus courte dans arr1 et arr2 respectivement.

Code source dans ultralytics/data/converter.py
def min_index(arr1, arr2):
    """
    Find a pair of indexes with the shortest distance between two arrays of 2D points.

    Args:
        arr1 (np.ndarray): A NumPy array of shape (N, 2) representing N 2D points.
        arr2 (np.ndarray): A NumPy array of shape (M, 2) representing M 2D points.

    Returns:
        (tuple): A tuple containing the indexes of the points with the shortest distance in arr1 and arr2 respectively.
    """
    dis = ((arr1[:, None, :] - arr2[None, :, :]) ** 2).sum(-1)
    return np.unravel_index(np.argmin(dis, axis=None), dis.shape)



ultralytics.data.converter.merge_multi_segment(segments)

Fusionne plusieurs segments en une seule liste en reliant les coordonnées avec la distance minimale entre chaque segment. Cette fonction relie ces coordonnées par une ligne fine pour fusionner tous les segments en un seul.

Paramètres :

Nom Type Description DĂ©faut
segments List[List]

Segmentations originales dans le fichier JSON de COCO. Chaque élément est une liste de coordonnées, comme [segmentation1, segmentation2,...].

requis

Retourne :

Nom Type Description
s List[ndarray]

Une liste de segments connectés représentés sous forme de tableaux NumPy.

Code source dans ultralytics/data/converter.py
def merge_multi_segment(segments):
    """
    Merge multiple segments into one list by connecting the coordinates with the minimum distance between each segment.
    This function connects these coordinates with a thin line to merge all segments into one.

    Args:
        segments (List[List]): Original segmentations in COCO's JSON file.
                               Each element is a list of coordinates, like [segmentation1, segmentation2,...].

    Returns:
        s (List[np.ndarray]): A list of connected segments represented as NumPy arrays.
    """
    s = []
    segments = [np.array(i).reshape(-1, 2) for i in segments]
    idx_list = [[] for _ in range(len(segments))]

    # Record the indexes with min distance between each segment
    for i in range(1, len(segments)):
        idx1, idx2 = min_index(segments[i - 1], segments[i])
        idx_list[i - 1].append(idx1)
        idx_list[i].append(idx2)

    # Use two round to connect all the segments
    for k in range(2):
        # Forward connection
        if k == 0:
            for i, idx in enumerate(idx_list):
                # Middle segments have two indexes, reverse the index of middle segments
                if len(idx) == 2 and idx[0] > idx[1]:
                    idx = idx[::-1]
                    segments[i] = segments[i][::-1, :]

                segments[i] = np.roll(segments[i], -idx[0], axis=0)
                segments[i] = np.concatenate([segments[i], segments[i][:1]])
                # Deal with the first segment and the last one
                if i in {0, len(idx_list) - 1}:
                    s.append(segments[i])
                else:
                    idx = [0, idx[1] - idx[0]]
                    s.append(segments[i][idx[0] : idx[1] + 1])

        else:
            for i in range(len(idx_list) - 1, -1, -1):
                if i not in {0, len(idx_list) - 1}:
                    idx = idx_list[i]
                    nidx = abs(idx[1] - idx[0])
                    s.append(segments[i][nidx:])
    return s



ultralytics.data.converter.yolo_bbox2segment(im_dir, save_dir=None, sam_model='sam_b.pt')

Convertit les données de détection d'objets existantes (boîtes de délimitation) en données de segmentation ou en boîtes de délimitation orientées (OBB) au format YOLO . Génère des données de segmentation à l'aide de l'auto-annotateur SAM si nécessaire.

Paramètres :

Nom Type Description DĂ©faut
im_dir str | Path

Chemin d'accès au répertoire d'images à convertir.

requis
save_dir str | Path

Chemin d'accès pour sauvegarder les étiquettes générées, les étiquettes seront sauvegardées dans labels-segment dans le même niveau de répertoire que im_dir si save_dir est None. Par défaut : Aucun.

None
sam_model str

Modèle de segmentation à utiliser pour les données de segmentation intermédiaires ; facultatif.

'sam_b.pt'
Notes

La structure du répertoire d'entrée supposée pour le jeu de données :

- im_dir
    ├─ 001.jpg
    ├─ ..
    └─ NNN.jpg
- labels
    ├─ 001.txt
    ├─ ..
    └─ NNN.txt
Code source dans ultralytics/data/converter.py
def yolo_bbox2segment(im_dir, save_dir=None, sam_model="sam_b.pt"):
    """
    Converts existing object detection dataset (bounding boxes) to segmentation dataset or oriented bounding box (OBB)
    in YOLO format. Generates segmentation data using SAM auto-annotator as needed.

    Args:
        im_dir (str | Path): Path to image directory to convert.
        save_dir (str | Path): Path to save the generated labels, labels will be saved
            into `labels-segment` in the same directory level of `im_dir` if save_dir is None. Default: None.
        sam_model (str): Segmentation model to use for intermediate segmentation data; optional.

    Notes:
        The input directory structure assumed for dataset:

            - im_dir
                ├─ 001.jpg
                ├─ ..
                └─ NNN.jpg
            - labels
                ├─ 001.txt
                ├─ ..
                └─ NNN.txt
    """
    from tqdm import tqdm

    from ultralytics import SAM
    from ultralytics.data import YOLODataset
    from ultralytics.utils import LOGGER
    from ultralytics.utils.ops import xywh2xyxy

    # NOTE: add placeholder to pass class index check
    dataset = YOLODataset(im_dir, data=dict(names=list(range(1000))))
    if len(dataset.labels[0]["segments"]) > 0:  # if it's segment data
        LOGGER.info("Segmentation labels detected, no need to generate new ones!")
        return

    LOGGER.info("Detection labels detected, generating segment labels by SAM model!")
    sam_model = SAM(sam_model)
    for l in tqdm(dataset.labels, total=len(dataset.labels), desc="Generating segment labels"):
        h, w = l["shape"]
        boxes = l["bboxes"]
        if len(boxes) == 0:  # skip empty labels
            continue
        boxes[:, [0, 2]] *= w
        boxes[:, [1, 3]] *= h
        im = cv2.imread(l["im_file"])
        sam_results = sam_model(im, bboxes=xywh2xyxy(boxes), verbose=False, save=False)
        l["segments"] = sam_results[0].masks.xyn

    save_dir = Path(save_dir) if save_dir else Path(im_dir).parent / "labels-segment"
    save_dir.mkdir(parents=True, exist_ok=True)
    for l in dataset.labels:
        texts = []
        lb_name = Path(l["im_file"]).with_suffix(".txt").name
        txt_file = save_dir / lb_name
        cls = l["cls"]
        for i, s in enumerate(l["segments"]):
            line = (int(cls[i]), *s.reshape(-1))
            texts.append(("%g " * len(line)).rstrip() % line)
        if texts:
            with open(txt_file, "a") as f:
                f.writelines(text + "\n" for text in texts)
    LOGGER.info(f"Generated segment labels saved in {save_dir}")





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