how to display the first block of the image by using block processing

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mahesh chathuranga
mahesh chathuranga am 25 Sep. 2013
my original image is 256*256.
fun=@(x) x.*3;
B = blkproc(I,[4 4],[1 1],fun);
how can i call to the first block and display first 4*4 matrix.

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