Matching detections to tracks
Four tracks with stable IDs, four draggable detections, and the IoU cost matrix between them. Matching is greedy above a threshold, which is the simplest version of what every tracking-by-detection system does each frame.
Try this
Drag two detections past each other. At the crossing point the IDs swap, and that is an identity switch — the error IDF1 exists to punish.
Solid = frame t (known tracks). Dashed = frame t+1 detections, so
drag them. Slide the two blue-ish boxes across each other to force an ID switch.
IoU cost matrix tracks × detections
This lab has no article yet. It is here because the idea is worth playing with on its own.
More in detectors and trackers
- A box edge as a distribution — Paint the 17 bins and watch the decoded edge move.
- Reading a detector's module graph — Rows are execution steps; columns are feature-map resolution.