Confused with camera width and height setting on config - 320x320 or 1280x720?

[Yonny24]

I understand that frigate resizes to 320x320 for analysis which uses cpu.
If I set my mainstream camera to
detect:
width: 320
height: 320
unfortunately I get no events but I can see myself being detected. Possibly false positives? No filters added.

But if I reset to
detect:
width: 1280
height: 720

I get true positives and events created.

So if it still using that 320x320 resized for both scenarios why do I get better detection on the 1280x720? Is the quality also reduced if I specify a 320x320 in the config?

Thanks

[NickM-27]

320x320 is the size of the resized region that is sent for detection, frigate does not send the entire camera frame for detection.

[Yonny24]

Yes I realise that so if my entire camera frame is set at 320x320 in the config then it analysis the whole frame. I see the green box around the entire debug frame.

So this 320x320 camera frame - entire size will result in poorer detections?

The 1280x720, even though only that 320x320 section is sent for analyses will result in more accurate detections?
That is what I observed comparing the 2 configs.

[NickM-27]

Yes, analyzing the whole frame leads to worse results in detection

[Yonny24]

Ah that explains it thanks.