| http://www.w3.org/ns/prov#value | - The correlation is measured by computing the cosine of the angular difference between the current reference angle and the average contour angle in the reference direction. ##EQU1## In equation 1, ??R represents the reference direction in which the correlation is being measured; ??i corresponds to the contours used for averaging in the ??R direction, n is an integer which in the present embodiment
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