【记录COCO数据集格式】实例分割的annotations.json的内部格式

• 在此记录一下实例分割coco的annotations.json的格式

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annotations.json,整体是一个字典:
{
"info": {"description": null,"url": null, "version": null, "year": 2023, "contributor": null, "date_created": "2023-05-27 10:34:38.709025"},
"licenses": [{"url": null, "id": 0, "name": null}],
"images": [{"license": 0,"url": null,"file_name": "....jpg","height": 800, "width": 800,"date_captured": null, "id": 0},{...},...,{...}]
"type": "instances",
"annotations": [{"id": 0, "image_id": 0, "category_id": 1,"segmentation": [[polygon]], "area": 57142.0, "bbox": [246.0, 165.0, 310.0, 239.0]([x,y,width,height],即左上角的坐标+宽高), "iscrowd": 0},{"id": 1, "image_id": 0, "category_id": 1, "segmentation": [[polygon]], "area": 59602.0, "bbox": [248.0, 164.0, 311.0, 238.0], "iscrowd": 0},{...},...,{...}],
"categories": [{"supercategory": null, "id": 0, "name": "_background_"},{"supercategory": null, "id": 1, "name": "cell"}] 
}
''