COCO (JSON) Export Format¶
COCO data format uses JSON to store annotations. It has five types of annotations: object detection, keypoint detection, stuff segmentation, panoptic segmentation, and image captioning. Basic higher level data format looks like this:
{
"info" : info,
"images" : [image],
"annotations" : [annotation],
"licenses" : [license],
}
info: {
"year" : int,
"version" : str,
"description" : str,
"contributor" : str,
"url" : str,
"date_created" : datetime,
}
image: {
"id" : int,
"width" : int,
"height" : int,
"file_name" : str,
"license" : int,
"flickr_url" : str,
"coco_url" : str,
"date_captured" : datetime,
}
license: {
"id" : int,
"name" : str,
"url" : str,
}
Sample COCO Format Export Output For Mask Shown Below¶
{
"images": [{
"coco_url": "",
"date_captured": "",
"file_name": "000045.dcm",
"flickr_url": "",
"id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"license": 0,
"height": 512,
"width": 512
}],
"categories": [],
"licenses": [],
"info": {},
"attributes": [],
"annotations": [{
"segmentation": [175.16666666666669, 174.1684027777778, 151.27777777777783, 200.83506944444446, 185.72222222222226, 215.2795138888889],
"annotations": [],
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"iscrowd": 0,
"id": "163b7530-acd2-4937-b529-27166f56b305",
"category_id": "polygon"
}, {
"segmentation": [202.18712029161605, 166.5030376670717, 217.11786148238156, 204.45200486026732, 254.4447144592953, 198.23086269744837, 242.00243013365736, 155.92709599027947],
"annotations": [],
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"iscrowd": 0,
"id": "163b7530-acd2-4937-b529-27166f56b305",
"category_id": "polygon"
}, {
"segmentation": [138.5, 253.140625, 200.5, 253.140625, 200.5, 285.140625, 138.5, 285.140625],
"annotations": [],
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"iscrowd": 0,
"id": "041b692e-11d6-4266-8bf6-1ae972de3c83",
"category_id": "Car"
}, {
"segmentation": [252.5, 239.140625, 302.5, 239.140625, 302.5, 277.140625, 252.5, 277.140625],
"annotations": [],
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"iscrowd": 0,
"id": "041b692e-11d6-4266-8bf6-1ae972de3c83",
"category_id": "Car"
}, {
"segmentation": [317.5, 157.140625, 317.5, 156.140625, 313.5, 156.140625, 307.5, 156.140625, 303.5, 156.140625, 297.5, 157.140625, 294.5, 158.140625, 289.5, 161.140625, 287.5, 162.140625, 285.5, 165.140625, 284.5, 167.140625, 283.5, 170.140625, 283.5, 172.140625, 284.5, 176.140625, 285.5, 179.140625, 290.5, 184.140625, 304.5, 192.140625, 312.5, 194.140625, 323.5, 196.140625, 333.5, 196.140625, 342.5, 193.140625],
"annotations": [],
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"iscrowd": 0,
"id": "041877cb-2371-49e3-b21f-c9960ef4c9af",
"category_id": "freehan"
}, {
"segmentation": [360.5, 159.140625, 359.5, 160.140625, 350.5, 164.140625, 346.5, 169.140625, 345.5, 175.140625, 345.5, 181.140625, 348.5, 187.140625, 354.5, 191.140625, 360.5, 194.140625, 367.5, 196.140625, 374.5, 197.140625, 382.5, 198.140625, 390.5, 197.140625, 399.5, 195.140625, 407.5, 191.140625, 411.5, 189.140625],
"annotations": [],
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm",
"iscrowd": 0,
"id": "041877cb-2371-49e3-b21f-c9960ef4c9af",
"category_id": "freehan"
}, {
"value": "c1",
"name": "Image size",
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm"
}, {
"value": "r1",
"name": "Image color",
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm"
}, {
"value": "o1",
"name": "opacity",
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm"
}, {
"value": "",
"name": "clarity",
"image_id": "dicomweb://localhost:8000/radiology/TCGA-CA-G4H2/DICOM/000045.dcm"
}]
}
