problem of applying block processing function

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mahesh chathuranga 2013-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/87756-problem-of-applying-block-processing-function

my image is gray scale image of 100*120. my programme is

*fun=@(x) x.*2;
B = blkproc(I,[4 4],[1 1],fun);*

when i'm looking for 1st sub block it gives only a single number, it equals to the twice of (1,1) pixel value of original image. can't i get the twice of 1st 4*4 block.is it possible or not.

采纳的回答

Image Analyst 2013-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/87756-problem-of-applying-block-processing-function#answer_97331

It gives a single number but you can multiply by ones(blockSize) to expand it. See the attached demos scripts.

You must have a really, really old version of MATLAB. It had a different name back then, something like blkproc, blkprc, or something like that. You need to find out what it's called in your ancient version of MATLAB. Or just upgrade.

mahesh chathuranga 2013-9-25