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A link to color histogram matching :

http://facweb.cs.depaul.edu/research/techreports/tr06-010.pdf

About image profile, guess they are talking about interesting keypoints to detect in the image or about the gradient image. Information can be found on the following links:

• http://docs.opencv.org/doc/tutorials/features2d/feature_detection/feature_detection.html#feature-detection

• http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/sobel_derivatives/sobel_derivatives.html#sobel-derivatives

Altough remember that feature point extractors do not work well with binary images. They need more information to find enough points.