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SURF: Speeded Up Robust Features, ECCV 2006. Herbert Bay, Tinne Tuytelaars, and Luc Van Gool - page 11 / 22

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Split the interest region up into 4 x 4 square sub-regions with 5 x 5 regularly spaced sample points inside

Calculate Haar wavelet response dx and dy

Weight the response with a Gaussian kernel centered at the interest point

Sum the response over each sub-region for dx and dy separately feature vector of length 32

In order to bring in information about the polarity of the intensity changes, extract the sum of absolute value of the responses feature vector of length 64

Normalize the vector into unit length

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