What counts as a "SWITCH"?

Adding on to #159, I’m wondering what counts as a “SWITCH”.

I looked at the docstring for the code here, but it still doesn’t seem right. If I’m reading this correctly, then the following scenario would be a switch:

Instance i in frame t is assigned to track_id 0. At frame t + 1, instance i is assigned to track_id 1.

Another possibility for a switch (or actually 2 switches) is if instance i and instance j at frame t are assigned to track_ids 0 and 1, respectively. And at frame t + 1, instance i is now assigned to 1, and instance j is now assigned to 0.

Figure 1. A possible switch.

For the image above, I would think it would log the event as a switch because the first update would map Oid=0 to Hid=0 and Oid=1 to Hid=1. Then, the 2nd update will map Oid=0 to Hid=1 and Oid=0 to Hid=1 (which will probably result in some error). Because Oid=0 is now mapped to Hid-1 instead of Hid=0, shouldn’t this be logged as a switch?

Thanks.

[cheind]

Thanks @jvlmdr 😃

[jvlmdr]

Are you happy for me to close this issue? Thanks!