If you are trying to compare an image (or part of it) with another images, I searched internet and found that leadtools has correlation functions that compare an image with all the areas of the same dimensions in another image. For more information, see this link:
http://www.leadtools.com/help/leadtools/v175/dh/po/leadtools.imageprocessing.core~leadtools.imageprocessing.core.correlationcommand.html
