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Why sum of elements of derivative masks need be zero?

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Pawan
Pawan 2013-4-11
Foe example: sobel, prewitt, roberts

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Matt J
Matt J 2013-4-11
编辑：Matt J 2013-4-11
Because a uniform image has derivative zero everywhere (i.e., has no edges) and should give zero when you run the derivative mask over it. Having the mask elements sum to zero ensures this.

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