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* For each pixel in a cell, compare the pixel to each of its 8 neighbors (on its left-top, left-middle, left-bottom, right-top, etc.). Follow the pixels along a circle, i.e. clockwise or counter-clockwise.
* Where the center pixel's value is greater than the neighbor, write "1". Otherwise, write "0". This gives an 8-digit binary number (which is usually converted to decimal for convenience).
* Compute the histogram, over the cell, of the frequency of each "number"
* Optionally normalize the histogram.
* Concatenate normalized histograms of all cells. This gives the feature vector for the window.
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