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isarandi / metrabs

Estimate absolute 3D human poses from RGB images.
https://arxiv.org/abs/2007.07227
MIT License
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Meaning of Z #37

Closed funnypig521 closed 2 years ago

funnypig521 commented 2 years ago

Excuse me.When I ran the demo, I found that the Z value was negative. What does this mean? Can absolute depth be negative?

isarandi commented 2 years ago

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.