| http://www.w3.org/ns/prov#value | - A small array of pixels, such as a 2???2 array, that lays on an edge of the target feature is identified, a plane is calculated based on the x coordinate, the y coordinate and the gray level of each of the pixels in the array, and an angle ?? between a reference line and a line at the intersection of the calculated plane and a reference plane is calculated.
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