How to add a mask to the image

[MrTHMX]

Hi! Thanks for your great work!
I have some questions about how to add a mask on the image so that only feature points are extracted in a specified area.

[Phil26AT]

Hi @MrTHMX, thank you for opening this issue and sorry for the late reply. The simplest approach would be to extract keypoints in each image, then interpolate the mask and remove the points which are not in the specified area. Then, run LightGlue on these filtered points. Another (more complex) approach is to mask the score map of the respective detector (e.g. multiply your mask with the score map from SP). The benefit is that you would get more points in the specified area, and thus more matches. This would not work for SIFT, however.