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Description
I'd like to learn about hough transformation and use vips_hough_line() for that. The goal is to use vips functionality to identify (and remove) satellite trails in astrophotography images which gets increasingly annoying due to StarLink and similar missions.
But any call to hough_line() on a grayscale image fails, e.g.:
vips hough_line satellites.pgm hough_votes.pgm
throws an error message
vips_colourspace: no known route from 'matrix' to 'b-w'
Do I need to prepare the input image in a specific way?
Thanks for help,
Thomas