Selective Mask Propagation for Multi-Object Tracking — HN submission

Tue, 14 Jul 2026 13:51:19 GMT

Show HN: Run SAM only when your tracker is uncertain – #1 on SportsMOT

This started when I saw a Roboflow tutorial tracking basketball players by giving every player's box to SAM2 and propagating masks through the whole clip (https://www.youtube.com/watch?v=yGQb9KkvQ1Q). Identity preservation worked way better than any dedicated tracker I'd used before but it only ran at 1–2 fps, where both speed and memory was scaling with player count. Most frames don't need SAM at all though. A normal tracking-by-detection tracker matches boxes frame to frame by solving an assignment problem on a cost matrix, and for most of a game that matching is completely trivial. It…

2 points; 0 discussion replies on HN. Paper and source history. A submission is not an endorsement.

Selective Mask Propagation for Multi-Object Tracking — mentioned by lapurita

Tue, 14 Jul 2026 13:30:40 GMT

Paper and discussion history. A mention is not an endorsement.

Selective Mask Propagation for Multi-Object Tracking · HackerPapers discussions

Selective Mask Propagation for Multi-Object Tracking — HN submission

Selective Mask Propagation for Multi-Object Tracking — mentioned by lapurita