COCOデータ フォーマット

#COCOデータ フォーマット
cocoデータセット（2017 Train/Val annotations）のフォーマットの備忘録。
image:id ⇔ anotation:image_id で、アノテーションがイメージと紐付けられる。

```JSON
{"info": 
    {"description" : "COCO 2017 Dataset",
     "url"         : "http://cocodataset.org",
     "version"     : "1.0",
     "year"        : 2017,
     "contributor" : "COCO Consortium",
     "date_created": "2017/09/01"},

 "licenses": 
     [{"url" : "http://creativecommons.org/licenses/by-nc-sa/2.0/",
       "id"  : 1,
       "name": "Attribution-NonCommercial-ShareAlike License"}, ... ],
             
 "images": 
     [{"license"      : 4,
       "file_name"    : "000000397133.jpg",
       "coco_url"     : "http://images.cocodataset.org/val2017/000000397133.jpg",
       "height"       : 427,
       "width"        : 640,
       "date_captured": "2013-11-14 17:02:52",
       "flickr_url"   : "http://farm7.staticflickr.com/6116/6255196340_da26cf2c9e_z.jpg",
       "id"           : 397133}, ... ],
           
 "annotations": 
     [{"segmentation": [[510.66,423.01, ... ,291.88,443.74]],
       "area"        : 27718.476299999995,
       "iscrowd"     : 0,
       "image_id"    : 61471,
       "bbox"        : [272.1,200.23,151.97,279.77],
       "category_id" : 18,
       "id"          : 1773}, ... ],
        
"categories": 
    [{"supercategory": "person","id": 1,"name": "person"},
     {"supercategory": "vehicle","id": 2,"name": "bicycle"},
     {"supercategory": "vehicle","id": 3,"name": "car"},
     {"supercategory": "vehicle","id": 4,"name": "motorcycle"},
     {"supercategory": "vehicle","id": 5,"name": "airplane"},
     {"supercategory": "vehicle","id": 6,"name": "bus"},
     {"supercategory": "vehicle","id": 7,"name": "train"},
     {"supercategory": "vehicle","id": 8,"name": "truck"},
     {"supercategory": "vehicle","id": 9,"name": "boat"},
     {"supercategory": "outdoor","id": 10,"name": "traffic light"},
     {"supercategory": "outdoor","id": 11,"name": "fire hydrant"},
     {"supercategory": "outdoor","id": 13,"name": "stop sign"},
     {"supercategory": "outdoor","id": 14,"name": "parking meter"},
     {"supercategory": "outdoor","id": 15,"name": "bench"},
     {"supercategory": "animal","id": 16,"name": "bird"},
     {"supercategory": "animal","id": 17,"name": "cat"},
     {"supercategory": "animal","id": 18,"name": "dog"},
     {"supercategory": "animal","id": 19,"name": "horse"},
     {"supercategory": "animal","id": 20,"name": "sheep"},
     {"supercategory": "animal","id": 21,"name": "cow"},
     {"supercategory": "animal","id": 22,"name": "elephant"},
     {"supercategory": "animal","id": 23,"name": "bear"},
     {"supercategory": "animal","id": 24,"name": "zebra"},
     {"supercategory": "animal","id": 25,"name": "giraffe"},
     {"supercategory": "accessory","id": 27,"name": "backpack"},
     {"supercategory": "accessory","id": 28,"name": "umbrella"},
     {"supercategory": "accessory","id": 31,"name": "handbag"},
     {"supercategory": "accessory","id": 32,"name": "tie"},
     {"supercategory": "accessory","id": 33,"name": "suitcase"},
     {"supercategory": "sports","id": 34,"name": "frisbee"},
     {"supercategory": "sports","id": 35,"name": "skis"},
     {"supercategory": "sports","id": 36,"name": "snowboard"},
     {"supercategory": "sports","id": 37,"name": "sports ball"},
     {"supercategory": "sports","id": 38,"name": "kite"},
     {"supercategory": "sports","id": 39,"name": "baseball bat"},
     {"supercategory": "sports","id": 40,"name": "baseball glove"},
     {"supercategory": "sports","id": 41,"name": "skateboard"},
     {"supercategory": "sports","id": 42,"name": "surfboard"},
     {"supercategory": "sports","id": 43,"name": "tennis racket"},
     {"supercategory": "kitchen","id": 44,"name": "bottle"},
     {"supercategory": "kitchen","id": 46,"name": "wine glass"},
     {"supercategory": "kitchen","id": 47,"name": "cup"},
     {"supercategory": "kitchen","id": 48,"name": "fork"},
     {"supercategory": "kitchen","id": 49,"name": "knife"},
     {"supercategory": "kitchen","id": 50,"name": "spoon"},
     {"supercategory": "kitchen","id": 51,"name": "bowl"},
     {"supercategory": "food","id": 52,"name": "banana"},
     {"supercategory": "food","id": 53,"name": "apple"},
     {"supercategory": "food","id": 54,"name": "sandwich"},
     {"supercategory": "food","id": 55,"name": "orange"},
     {"supercategory": "food","id": 56,"name": "broccoli"},
     {"supercategory": "food","id": 57,"name": "carrot"},
     {"supercategory": "food","id": 58,"name": "hot dog"},
     {"supercategory": "food","id": 59,"name": "pizza"},
     {"supercategory": "food","id": 60,"name": "donut"},
     {"supercategory": "food","id": 61,"name": "cake"},
     {"supercategory": "furniture","id": 62,"name": "chair"},
     {"supercategory": "furniture","id": 63,"name": "couch"},
     {"supercategory": "furniture","id": 64,"name": "potted plant"},
     {"supercategory": "furniture","id": 65,"name": "bed"},
     {"supercategory": "furniture","id": 67,"name": "dining table"},
     {"supercategory": "furniture","id": 70,"name": "toilet"},
     {"supercategory": "electronic","id": 72,"name": "tv"},
     {"supercategory": "electronic","id": 73,"name": "laptop"},
     {"supercategory": "electronic","id": 74,"name": "mouse"},
     {"supercategory": "electronic","id": 75,"name": "remote"},
     {"supercategory": "electronic","id": 76,"name": "keyboard"},
     {"supercategory": "electronic","id": 77,"name": "cell phone"},
     {"supercategory": "appliance","id": 78,"name": "microwave"},
     {"supercategory": "appliance","id": 79,"name": "oven"},
     {"supercategory": "appliance","id": 80,"name": "toaster"},
     {"supercategory": "appliance","id": 81,"name": "sink"},
     {"supercategory": "appliance","id": 82,"name": "refrigerator"},
     {"supercategory": "indoor","id": 84,"name": "book"},
     {"supercategory": "indoor","id": 85,"name": "clock"},
     {"supercategory": "indoor","id": 86,"name": "vase"},
     {"supercategory": "indoor","id": 87,"name": "scissors"},
     {"supercategory": "indoor","id": 88,"name": "teddy bear"},
     {"supercategory": "indoor","id": 89,"name": "hair drier"},
     {"supercategory": "indoor","id": 90,"name": "toothbrush"}]
}
```