load masks from colmap-style output directory in DensifyPointCloud

[dllu]

Loads masks from an arbitrary folder.

[cdcseacave]

nice, but instead of adding support for importing masks in each interface, why not use instead the --mask-path <folder> functionality already existing in DensifyPointcloud which does exactly this?

[ghost]

I think it's nice as well but since colmap doesn't natively undistort masks, the image extension can be renamed to .mask.png in a script to work with --mask-path, dllu.

[cdcseacave]

if that is true (colmap does no undistort the masks as well) then this change make even less sense: even if imported in MVS they will be wrongly used; so the only way to make this happen is a script using colmap and the undistoreted scene params that undistorts the masks (as at the interface point the scene does not have this information anymore), and in the process can also make sure they follow the OpenMVS file naming