Vai al contenuto

Riferimento per ultralytics/data/converter.py

Nota

Questo file Γ¨ disponibile all'indirizzo https://github.com/ultralytics/ ultralytics/blob/main/ ultralytics/data/converter .py. Se riscontri un problema, contribuisci a risolverlo inviando una Pull Request πŸ› οΈ. Grazie πŸ™!



ultralytics.data.converter.coco91_to_coco80_class()

Converte gli ID delle classi COCO a 91 indici in ID delle classi COCO a 80 indici.

Restituzione:

Tipo Descrizione
list

Un elenco di 91 ID di classe in cui l'indice rappresenta l'ID di classe a 80 indici e il valore Γ¨ il corrispondente ID di classe a 91 indici. corrispondente ID classe a 91 indici.

Codice sorgente in 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)] # da darknet a coco x2 = [list(b[i] == a).index(True) if any(b[i] == a) else None for i in range(91)] # da coco a darknet ```

Codice sorgente in 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)

Converte le annotazioni del dataset COCO in un formato di annotazione YOLO adatto all'addestramento dei modelli YOLO .

Parametri:

Nome Tipo Descrizione Predefinito
labels_dir str

Percorso della directory contenente i file di annotazione del set di dati COCO.

'../coco/annotations/'
save_dir str

Percorso della directory in cui salvare i risultati.

'coco_converted/'
use_segments bool

Se includere le maschere di segmentazione nell'output.

False
use_keypoints bool

Se includere o meno le annotazioni dei punti chiave nell'output.

False
cls91to80 bool

Se mappare 91 ID di classe COCO ai corrispondenti 80 ID di classe COCO.

True
lvis bool

Se convertire i dati in un dataset lvis.

False
Esempio
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)
Uscita

Genera file di output nella directory di output specificata.

Codice sorgente in 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:
                f.writelines(f"{line}\n" for line in image_txt)

    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)

Converte le annotazioni dei dataset DOTA nel formato OBB (Oriented Bounding Box) di YOLO .

La funzione elabora le immagini contenute nelle cartelle "train" e "val" del dataset DOTA. Per ogni immagine, legge l'etichetta etichetta associata dalla cartella labels originale e scrive nuove etichette in formato YOLO OBB in una nuova cartella.

Parametri:

Nome Tipo Descrizione Predefinito
dota_root_path str

Il percorso della directory principale del dataset DOTA.

richiesto
Esempio
from ultralytics.data.converter import convert_dota_to_yolo_obb

convert_dota_to_yolo_obb('path/to/DOTA')
Note

La struttura di directory assunta per il set di dati DOTA:

- DOTA
    β”œβ”€ images
    β”‚   β”œβ”€ train
    β”‚   └─ val
    └─ labels
        β”œβ”€ train_original
        └─ val_original

Dopo l'esecuzione, la funzione organizzerΓ  le etichette in:

- DOTA
    └─ labels
        β”œβ”€ train
        └─ val
Codice sorgente in 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
                β”œβ”€ images
                β”‚   β”œβ”€ train
                β”‚   └─ val
                └─ labels
                    β”œβ”€ train_original
                    └─ val_original

        After execution, the function will organize the labels into:

            - DOTA
                └─ labels
                    β”œβ”€ 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)

Trova una coppia di indici con la distanza piΓΉ breve tra due array di punti 2D.

Parametri:

Nome Tipo Descrizione Predefinito
arr1 ndarray

Un array NumPy di forma (N, 2) che rappresenta N punti 2D.

richiesto
arr2 ndarray

Un array NumPy di forma (M, 2) che rappresenta M punti 2D.

richiesto

Restituzione:

Tipo Descrizione
tuple

Una tupla contenente gli indici dei punti con la distanza piΓΉ breve in arr1 e arr2 rispettivamente.

Codice sorgente in 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)

Unisci piΓΉ segmenti in un unico elenco collegando le coordinate con la distanza minima tra ogni segmento. Questa funzione collega queste coordinate con una linea sottile per unire tutti i segmenti in uno solo.

Parametri:

Nome Tipo Descrizione Predefinito
segments List[List]

Segmentazioni originali nel file JSON di COCO. Ogni elemento Γ¨ un elenco di coordinate, come [segmentation1, segmentation2,...].

richiesto

Restituzione:

Nome Tipo Descrizione
s List[ndarray]

Un elenco di segmenti connessi rappresentati come array NumPy.

Codice sorgente in 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')

Converte il dataset di rilevamento oggetti esistente (bounding box) in un dataset di segmentazione o in un bounding box orientato (OBB) nel formato YOLO . Genera dati di segmentazione utilizzando l'auto-annotatore di SAM , se necessario.

Parametri:

Nome Tipo Descrizione Predefinito
im_dir str | Path

Percorso della directory dell'immagine da convertire.

richiesto
save_dir str | Path

Percorso per salvare le etichette generate, le etichette verranno salvate in labels-segment nello stesso livello di directory di im_dir se save_dir Γ¨ None. Predefinito: Nessuno.

None
sam_model str

Modello di segmentazione da utilizzare per i dati di segmentazione intermedi; opzionale.

'sam_b.pt'
Note

La struttura della directory di input assunta per il set di dati:

- im_dir
    β”œβ”€ 001.jpg
    β”œβ”€ ..
    └─ NNN.jpg
- labels
    β”œβ”€ 001.txt
    β”œβ”€ ..
    └─ NNN.txt
Codice sorgente in 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
                β”œβ”€ 001.jpg
                β”œβ”€ ..
                └─ NNN.jpg
            - labels
                β”œβ”€ 001.txt
                β”œβ”€ ..
                └─ 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 label in tqdm(dataset.labels, total=len(dataset.labels), desc="Generating segment labels"):
        h, w = label["shape"]
        boxes = label["bboxes"]
        if len(boxes) == 0:  # skip empty labels
            continue
        boxes[:, [0, 2]] *= w
        boxes[:, [1, 3]] *= h
        im = cv2.imread(label["im_file"])
        sam_results = sam_model(im, bboxes=xywh2xyxy(boxes), verbose=False, save=False)
        label["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 label in dataset.labels:
        texts = []
        lb_name = Path(label["im_file"]).with_suffix(".txt").name
        txt_file = save_dir / lb_name
        cls = label["cls"]
        for i, s in enumerate(label["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)