I'm trying to take an image of a pencil sketch (http://www.vangoghgallery.com/catalog/image/1442/Sower-with-Setting-Sun.jpg) and colorize the different segments based on the texture. So in this image, the sky and the man and the wheat in the background would all be a different color.
I've found I can sort of use texture-based segmentation with a gabor filter (https://reference.wolfram.com/legacy/v9/example/TextureBasedSegmentation.html) but it doesn't exactly get what I'm looking for. It isn't able to colorize the dots or the blank space in the sky.
Any other methods that are obvious that I should try?