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There are some diffrent ways of image comparison. Which is the best, based on your specific needs. You could refer to the following links about your issue:
(1) How to compare two images using C#: http://www.c-sharpcorner.com/UploadFile/prathore/ImageComparison01022009050404AM/ImageComparison.aspx.
(2) Comparing two images by computing and comparing their hash values: http://www.codeproject.com/KB/GDI-plus/comparingimages.aspx.
(3) A windows forms application that checks if two images are the same: http://www.dotnetspider.com/resources/19811-Image-Compare-C.aspx.
In addition, this one is talking about fast algorithm of image comparison: http://stackoverflow.com/questions/843972/image-comparison-fast-algorithm.
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