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Hi Matlabist! i want to process an image, precisely i need to build a relational filter, applying a kind of convolution (but relationa, i can't use a normal convolution) on the whole image. i want to process the image step by step on small region of interest on it, let's say a 3X3 mask that moves as a convolution. is there a faster method to extract rectangular region moving it in the whole image instead of a "for" loop. thanks in advance fa --------\ ------------------------ Dr. Fabio Mazzone - INFM & DIST, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy fax +39-010314218; tel+39-0103536309 --------\ ------------------------ |