Meaning of Z
funnypig521 opened this issue · comments
Excuse me.When I ran the demo, I found that the Z value was negative. What does this mean?
Can absolute depth be negative?
Z is the depth, the distance along the optical axis of the camera. It's not impossible that this may be negative in certain exceptional cases, like a person standing very close to the camera, and the model estimating that some of the joints that are not visible within the image might be behind the camera. But this is unlikely to happen.