| http://www.w3.org/ns/prov#value | - The edges can include various types of directional edges, preferably, vertical, horizontal, 45 degree and 135 degree edges 301, 303, 305 and 307; and a non-directional edge 309 including at least one edge of undesignated direction. [0031] In order to generate an edge histogram for a sub-image, it is necessary to detect an edge feature from an image-block.
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