general_json2yolo.py

import numpy as np
from tqdm import tqdm
from pathlib import Path
import json
from collections import defaultdict
import sys
import pathlib

CURRENT_DIR = pathlib.Path(__file__).parent
sys.path.append(str(CURRENT_DIR))


def make_dirs(path='coco'):
    # Create folders
    path = Path(path)
    for p in [path / 'labels']:
        p.mkdir(parents=True, exist_ok=True)  # make dir
    return path


def coco91_to_coco80_class():  # converts 80-index (val2014) to 91-index (paper)
    # https://tech.amikelive.com/node-718/what-object-categories-labels-are-in-coco-dataset/
    x = [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]
    return x


def convert_coco_json(
        json_dir='coco/annotations/',
        use_segments=False,
        cls91to80=False):
    save_dir = make_dirs()  # output directory
    coco80 = coco91_to_coco80_class()
    """Convert raw COCO dataset to YOLO style
    """

    # Import json
    for json_file in sorted(Path(json_dir).resolve().glob('instances_val2017.json')):
        fn = Path(save_dir) / 'labels' / \
             json_file.stem.replace('instances_', '')  # folder name
        fn.mkdir()
        with open(json_file) as f:
            data = json.load(f)

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

        txt_file = open(Path(save_dir / 'val2017').
                        with_suffix('.txt'), 'a')
        # Write labels file
        for img_id, anns in tqdm(
                imgToAnns.items(), desc=f'Annotations {json_file}'):
            img = images['%g' % img_id]
            h, w, f = img['height'], img['width'], img['file_name']
            bboxes = []
            segments = []

            txt_file.write(
                './images/' + '/'.
                join(img['coco_url'].split('/')[-2:]) + '\n')
            for ann in anns:
                if ann['iscrowd']:
                    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)
                # Segments
                if use_segments:
                    if 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
                    if s not in segments:
                        segments.append(s)

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


def min_index(arr1, arr2):
    """Find a pair of indexes with the shortest distance.
    Args:
        arr1: (N, 2).
        arr2: (M, 2).
    Return:
        a pair of indexes(tuple).
    """
    dis = ((arr1[:, None, :] - arr2[None, :, :]) ** 2).sum(-1)
    return np.unravel_index(np.argmin(dis, axis=None), dis.shape)


def merge_multi_segment(segments):
    """Merge multi segments to one list.
    Find the coordinates with min distance between each segment,
    then connect these coordinates with one thin line to merge all
    segments into one.

    Args:
        segments(List(List)): original
            segmentations in coco's json file.
            like [segmentation1, segmentation2,...],
            each segmentation is a list of coordinates.
    """
    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


if __name__ == '__main__':
    convert_coco_json('coco/annotations',
                      use_segments=False,
                      cls91to80=True)