| http://www.w3.org/ns/prov#value | - ess along x which are large enough to be regarded as edges of an object; c) finding the midpoint between any two edges lying on the same scan line, i.e. a line that is parallel to the image's x axis; d) feeding all the midpoints from above into a straight line detector; keeping a record of the parameters of each skew-symmetry line thus detected, as well as the skew symmetric set of edges that gave
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