怎样得到annotations中box的后两个元素
{
"images": [
{
"file_name": "6642.jpg",
"width": 1,
"height": 1,
"id": "6642"
},
{
"file_name": "6643.jpg",
"width": 1,
"height": 1,
"id": "6643"
}
],
"categories": [
{
"supercategory": "CYST",
"name": "CYST",
"id": 1
},
{
"supercategory": "Effusion",
"name": "Effusion",
"id": 2
}
],
"annotations": [
{
"area": 557.0,
"category_id": 1,
"image_id": "6642",
"iscrowd": 0,
"bbox": [
303.0,
317.0,
27.0,
21.0
],
"id": 0
},
{
"area": 1420.0,
"category_id": 2,
"image_id": "6643",
"iscrowd": 0,
"bbox": [
115.0,
130.0,
26.0,
55.0
],
"id": 1
}
]
}
怎样得到annotations中box的后两个元素