Area file Questions

Software Python
1

im using ZED2i camera + ZED Box to perform an SVO recording
I have taken this recording and ran it through some play back to generate a .area file. Im just wondering whether i can play back the same SVO but skip to a specific frame e.g. frame 600 and i would have thought because it has loaded in the .area file that it would attempt to relocalize and tell me my position at frame 600 but it doesnt it always starts at 0.

am i doing something incorrect here or is that just not something that is possible?

Any help would be appreciated

2

Hi @davidhutchy

have you tried to use the setSVOPosition function?

3

Yes that what i was doing but it seemed to never attempt to search and always just had x/y/z of zero i had set_svo_position to 500

4

what’s the value of POSITIONAL_TRACKING_STATE returned by the getPosition function?

5

I see now the tracking state was UNAVAILBLE at times.
What i have noticed is that if it is darker in in particular frames of the recording then it struggles to relocalize. so what i had was when i played it from frame 500 (it was a bit darker at that time and didnt come into light again until around frame 1,600 where it did in fact relocalize).

So i have another question is there a way to improve the “relocalization” even in darker scenes / areas

Thanks,
David Hutchinson

6

Hi @davidhutchy
relocation highly relies on visual features.
If there are no visual features to be detected it’s not possible for the process to complete.
Unfortunately, ZED are passive stereo vision devices and perform correctly only when light conditions are good.