Calculate pixel contrast

Experts

i am new on image processing. I am using embedded visual C++ for pocket pc programming . I want to know how to calculate the contrast of each pixel , then find out the maximum contrast point.

Any fast algorithm to do it? It is better to have some sample

Many Thanks
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smalleeAsked:
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Jaime OlivaresSoftware ArchitectCommented:
I am not sure about what you mean with contrast.
Contrast is a relative value that can't be calculated for individual pixels, you need to analyze all pixels of an image first.
Maybe you want to know luminosity of each pixel, there is a simple formula to convert a color value to a grey level, then you can calculate max and min values to apply contrast compensation:

grey = 0.299*red + 0.587*green + 0.114*blue;
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Jaime OlivaresSoftware ArchitectCommented:
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