| http://www.w3.org/ns/prov#value | - The histogram generator 153 sets a m???m pixel area (where m is a value smaller than the shortest side of the input surface 17) centered on the position of the fingertip OF detected by the fingertip position detector 152 as a detection area R1, and differentiates luminance values of the pixels in the set detection area R1 with respect to X, Y-directions to generate a differential histogram.
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