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* Divide the examined window into cells (e.g. 16x16 pixels for each cell).
* For each pixel in a cell, compare the pixel to each of its [[Pixel connectivity|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's value, write "0". Otherwise, write "1". 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" occurring (i.e., each combination of which pixels are smaller and which are greater than the center). This histogram can be seen as a 256-dimensional [[feature vector]].
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