How to enhance the image to improve interpretation of information in image

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How can I do an image enhancement on these images?

I am doing coding in C#, EmguCV(OpenCV wrapper)

Potential Problem
1.Image is partially shaded
2.Image contains reflected image on the image
3.Image too dark or too bright The pic can be found in here

How I can remove each of these problem?

(Look at the signboard on the image)
http://img85.imageshack.us/img85/7826/reflectionshadowimages.png[^]

Posted 5-Jul-10 1:39am

xabixabi123

Updated 29-Sep-11 8:26am

C_Johnson

v2

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E.F. Nijboer · Answer 1 · 2010-07-05T06:51:00

Solution 1

Analyze the image and define a threshold. Then the values above are made black and the other pixels white (working in b/w is much more easy). You can also define filters for removing shades, little spots and other stuff unusable as good as possible. Multiple filters maybe possible. Look the internet with the term "computer vision"

Good luck!!!

Posted 5-Jul-10 6:51am

E.F. Nijboer

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xabixabi123 5-Jul-10 12:56pm

How can define a threshold ?

so u mean to solve this problem just turn it into black and white images?

E.F. Nijboer 6-Jul-10 5:11am

Yes. But it is of course the question what you want to do with it. But for a lot of enhancements b/w is used. It makes a stencil that can then be used to filter out certain stuff, like shades and reflections. These filtered image information can be discarded and therefore simply removed or could be filtered/adjusted as needed. It makes it possible to filter out the shadow only and adjust it in a way that it matches the non shadowed piece of the image as much as possible. The use of b/w is the most convenient because it's simply selecting what you want, and don't want. When using grayscales you would still be looking for the correct threshold. It's just helpfull to select out what you want to adjust and leave the rest intact. Perform operations and put it back. This ensures that the rest is untouched and also makes it possible to follow the different steps visually. Also, think about making stencils using different methods and the possibilities to perform operations like add, and, subtract and in this way use multiple stencils to filter just what you want in steps. By the way, use colorspaces that make the process easier. Like HSV and HSL are pretty handy.