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Matching can be done in a lot of different ways, basically BoW is a basic approach for pixelwise comparison. You could do a histogram comparison approach, or go further and apply keypoint feature matching using SIFT, SURF, ORB, FREAK, BRIEF, ...

So try some stuff out, using this usefull links

• http://docs.opencv.org/modules/features2d/doc/features2d.html
• http://docs.opencv.org/modules/imgproc/doc/histograms.html