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graphics filters

Posted: Wed Aug 01, 2007 8:03 am
by samaelek
Hello,
I have a program to write which is supposed to perform image adjustment for
medical/diagnostic purposes, and I have a problem with a number of filters
I need to use:

- image despeckle filters: median, high- and low-pass
- morphological transformations: erosion, dilatation
- White Top Hat
- negative
- binarization

Does anyone know where I could take a look at algorithms like that, as I
need at least some hints that would help me finish the program. Ideally,
maybe they're available to download somewhere.

Thanks in advance. :)

Posted: Wed Aug 01, 2007 8:05 am
by feyd
Most of those use convolution matrices for the image manipulation, with some various algorithmic operators thrown in.

Posted: Wed Aug 01, 2007 1:36 pm
by samaelek
Thank you - though I was actually hoping for some more practical examples of those filters and their application. I already know that this matrix is used there; what I really need are the algorithms or examples of such filters as those I need (mentioned in the first post) that I could look at to code my own, or to use in coding mine.

Posted: Wed Aug 01, 2007 1:58 pm
by programmingjeff
Take a look at the phpThumb library for some of your transformations. It may save you from having to manually code some of the transformations.

http://phpthumb.sourceforge.net/demo/de ... o.demo.php