Comparing two HOG descriptors vectors

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Hi Ben-Uri. From what I know the vector should be multiply of 9, which means that it's a flatten version of HoG with 9 bins. Each 9 float in that vector should represent a single cell region (? correct me if I'm wrong).

I'm creating my own HoG using OpenCV's function (besides its own HoG method), and you can find it here: http://code.google.com/p/custom-hog-pedestrian/

A similar question is asked here:

http://stackoverflow.com/questions/11626140/extracting-hog-features-using-opencv

they just do a hog-to-hog distance accumulating the error.. nothing complicated, just an accumulation error between two float array (the two hog must be of the same size of course)