Total number of objects calculation

[amm272]

Hello,

This issue is related to the 'num_objects' value, calculated as the num_matches + num_switches. I have a few questions:

• Is num_objects supposed to be equal to the total number of ground truth objects within all the frames?
• If so, why is the num_object metric not calculated from the ground truth data, instead of being the sum of switches plus matches?

I have an issue where the total num_objects counted is larger than the sum of all the ground truth objects. For example, I count 24 objects, but the total number reported is 30. Usually each frame has 6 objects, so the result is off by exactly one frame. What cold be the source of this error?

[cheind]

@jvlmdr are you familiar with this?

[amm272]

Thank you for raising this with @jvlmdr . Is there a way I could print the output of the accumulator per frame? Having the number of matches and switches at each stage could be helpful with debugging.

[cheind]

yes. see the readme here https://github.com/cheind/py-motmetrics#populating-the-accumulator