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Check out following links :

http://stackoverflow.com/questions/11173816/compare-2-16x16-pixel-images-similarity

http://stackoverflow.com/questions/23931/what-algorithm-to-compare-two-images

http://stackoverflow.com/questions/827680/where-can-i-find-code-for-comparing-two-images-and-determining-how-similar-they?lq=1

http://stackoverflow.com/questions/189943/how-can-i-quantify-difference-between-two-images

http://stackoverflow.com/questions/25977/how-can-i-measure-the-similarity-between-two-images