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Please, I need ahelp about the mask ?

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Eman Shaltout
Eman Shaltout on 3 Feb 2015
Closed: MATLAB Answer Bot on 20 Aug 2021
any one can help me about ,why the sum of mask should be zero ? like sobel , Prewitt ,median ,lablacian........
why please sum of mask = 0 ?

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