【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

''
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"}] 
}
''