Blender Git Commit Log

Support normalization in the tracking prepass

The last tracker commit added normalized tracking. This makes
tracking patches undergoing uniform illumination change easier.
However, the prepass which computes a quick translation-only
estimate of the warp did not take this into account. This commit
fixes that.

This works reasonably well but in some examples the brute
initialization fails. I suspect this is due to the warped template
estimate in the current frame being too different from the
original, so there are multiple peaks in the normalized-SAD
correlation function.

The solution is to use the previous frame for the brute
initialization and the keyframe for refinement, but that requires
architecture changes.