[nsonha]

> A segment then is a collection of images that follow each other in time?

A segment is a visually distinctive... segment of image, segmentation is basically splitting an image into objects: https://segment-anything.com, as such it has nothing to do with time or video.

Now SAM 2 is about video, so they seem to add object tracking (that is attributing same object to the same segment throughout frames)

The videos in the main article demonstrate that it can track objects in and out of frame (the one with bacteria or the one with boy going around the tree). However they do acknowledge this part of the algorithm can produce incorrect result sometimes (example with the horses).

The answer to your question is img1, img2, img4, as there is no reason to believe that it can only track objects in contiguous sequence.

[bryanrasmussen]

Thanks!