Am 12.01.2013 17:00, schrieb handos:

> I tried inverting the z direction (direction -z in povray code) but I observed
> same thing. I can't quite figure out why the depth values that are parallel to
> the optical axis seem to register images properly than the ones that are Y axis.
> I'm surprised even that the ceiling is aligned.

Your camera movement in this example is (more or less) limited to the 
left/right direction, i.e. parallel to the unaffected walls. So if your 
algorithm makes some mistakes in calculating the absolute position of 
the ceiling or rear wall, it will make the same mistake in both images. 
It may actually match the wrong points, but those points will be roughly 
at the same distance and hence the mismatch won't be detected.

This is why I suggest to repeat the experiment with (2) an up/down 
camera movement, and (3) a front/back movement, instead of the 
left/right movement. Your algorithm's reaction to those different 
scenarios might give important clues where to look for the error. 
Likewise, repeating those three experiments with the camera facing in 
the +X direction might also give valuable insight.

Post a reply to this message