5种标注类型: bounding box, segmentation, 3D cuboid, keypoint and landmark, line and splines
3种标注存储格式:COCO(json), Pascal VOC(xml), YOLO(txt)
标注工具:
Ref:
https://towardsdatascience.com/imagta-labelling-and-annotation-everything-you-need-to-know-86ede6c684b1
https://hackernoon.com/the-best-image-annotation-platforms-for-computer-vision-an-honest-review-of-each-dac7f565fea