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Hi! Question about image processing.

Asked by Portgas Ace on 9 Aug 2014
Latest activity Commented on by Image Analyst
on 15 Aug 2014
So I have here different retinal images and they all have different 'contrast'. What can I do to make these images have the same 'intensity' or 'contrast' or 'appearance' between them. Is there a way where for example an image seems dark, it will be contrasted to a lighter image and if it's a light image, it will be contrasted the other way around?

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1 Answer

Answer by Image Analyst
on 9 Aug 2014
Edited by Image Analyst
on 9 Aug 2014

You can try histogram matching like this algorithm: http://www.eyemaginary.com/Portfolio/ColorHistogramWarp.html
The Image Processing Toolbox also has a imhistmatch() function in it. I also have a histogram matching routine in my File Exchange http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 where you can make the histogram be any shape you like, for example below I make the histogram be the shape of the girl's silhouette:
Or you can play around with imadjust().
You might also look into HDR, High Dynamic Range Imaging.

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hi! the link you've given about the colorhistwarp by mark grundland seems to be promising. But i cant seem to find a sample code for me to work with. We're allowed to use already working codes as long as we have understand how does it happen. If you could help me find a code to perform the colorhist warping, I would appreciate it really much.
Sorry, I'd like to have the Grundland algorithm in MATLAB code but I don't. If you code it up, please put it on the File Exchange. It is the best color histogram matching algorithm I've seen.

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