| http://www.w3.org/ns/prov#value | - According to a third aspect of the present invention, the image signal is a two-dimensional image signal formed by horizontal and vertical lines, and the zigzag signal is intersectionally generated in two directions of the horizontal and vertical lines in the image signal in the step (a), while the method calculates a weighted mean of the output level of the zigzag signal generated along the two d
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