Removing patterns from images
Apr 15, 2019 10:23:29 #
Patterns occur on images occasionally, particularly scanned or copied images. The most common pattern is a halftone, but sometimes a copy of a print will show a pattern from the texture of the paper it was printed on. The Fourier transform technique is available to remove these patterns. It's not perfect but it helps a lot.
I put together a tutorial on this subject for those who might need to try it out. There are two downloads available, one is a plug-in for Photoshop, the other is a standalone java-based program. They are not too difficult to use. They work on images that have a regular pattern that covers the entire image. I have not attempted to use either program on images with a small localized pattern.
As an example, the only photo I have of one of my uncles as a mature man is scanned from a wedding album from 1966. The print is on textured paper which produces an annoying overlay on the image.
After using the FFT technique the image is much improved (not really perfect, but usable).
I put together a tutorial on this subject for those who might need to try it out. There are two downloads available, one is a plug-in for Photoshop, the other is a standalone java-based program. They are not too difficult to use. They work on images that have a regular pattern that covers the entire image. I have not attempted to use either program on images with a small localized pattern.
As an example, the only photo I have of one of my uncles as a mature man is scanned from a wedding album from 1966. The print is on textured paper which produces an annoying overlay on the image.
After using the FFT technique the image is much improved (not really perfect, but usable).
Apr 15, 2019 11:31:18 #
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