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I did not find in Mathematica a function for Histogram of Oriented Gradients (HOG) descriptors.

Is there any similar function? Do you have an implementation you are willing to share?

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How far have you got with your implementation, ImageConvolve might be a good place to start? –  image_doctor Dec 6 '12 at 1:27

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From the Mathematica 9 help for GradientOrientationFilter:

Compute the histogram of oriented gradient (HOG) for an image, where each pixel casts a vote weighted by its gradient magnitude in the bin corresponding to its local orientation:

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Yes, this implementation is a bit crude but conveys the idea. –  Matthias Odisio Dec 13 '12 at 16:08

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