Centroid-based association in OCSORT keeps switching IDs for the same detection

[ThenoobMario]

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Question

Hello, I am experimenting with the centroid-based association for my use case where I won't be able to process a lot of frames at the same time. I went through #1246 where it showed good results. However, when there are two persons in the frame, the id keeps on switching between the two, alternatively showing 1 and 2 over the same person.

What can be the issue?

[mikel-brostrom]

If the threshold for the association is too large. There is certainly a risk of objects being mixed up. Try a lower threshold.

[ThenoobMario]

Hi @mikel-brostrom, thanks for the reply. I am attaching my configurations.

tracker = OCSORT(det_thresh = 0.4,
                 max_age = 120,
                 min_hits = 3,
                 asso_threshold = 0.2,
                 delta_t = 3,
                 asso_func = "centroid",
                 use_byte = False)

The ID switching is still an issue. I tried keeping the asso_threshold high as well as low.

[mikel-brostrom]

Centroid-based association may be problematic if both objects are within each others association distances. There is no magic solution for this...

[ThenoobMario]

I do understand it can be problematic for objects that are within each other's association distances. Here is a case. Will this count as objects being within their association distances?

[mikel-brostrom]

The performance of your object detector seems to be very poor. A lot of flickering is noticeable in the video. This is clearly not a problem mainly of the tracker but of the object detector.