I need help with separating two gray scale images. It is masked message but there is a static (randi) image on top of it or incorporated into its data. I need to remove the static and make it a clear message. The image is just one .bmp file.

I need help with separating two gray scale images. It is masked message but there is a static (randi) image on top of it or incorporated into its data. I need to remove the static and make it a clear message. The image is just one .bmp file. Thank you for any help or suggestions. I have tried filtering it out but it still has some static in it.

Answer 1

[Image Analyst]

You could try medfilt2() (median filtering), or a mean shift filter, or a salt and pepper noise filter, like the attached, or other more sophisticated things like a a sigma filter, a knn filter, non-local means, or BM3D. You may not be able to get rid of 100% of all noise.

You should look over this survey paper: https://users.soe.ucsc.edu/~milanfar/publications/journal/ModernTour_FinalSubmission.pdf A tour modern image filters by one of the leading researchers in the denoising area.