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Bounding boxes are one of the most commonly used types of image annotations in computer vision. Polygonal segmentation tells a computer vision system where to look for an object. Line annotations are used primarily to delineate boundaries between one part of an image and another. 3D Cuboids are a powerful type of image annotation, similar to bounding boxes in that they distinguish where a classifier should look for objects. The most common image annotation for computer vision systems is the creation of dots/points across an image.