Disallow matches on background (black points)

[estaudere]

I want to force mast3r to ignore all background pixels when creating the point cloud (essentially, to disallow keypoint matches on the black pixels). I've tried filtering out black points during point cloud post-processing, but this leaves a bit of noise around the main object because those points are no longer true black, and I don't want to rely on this method as it is kind of hacky. I would love to have a way to remove those points in a more fool-proof manner that would hopefully also speed up execution, but I'm struggling to figure out if this is possible.

[cwchenwang]

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