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problem of applying block processing function

Asked by mahesh chathuranga on 20 Sep 2013

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.

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mahesh chathuranga

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1 Answer

Answer by Image Analyst on 20 Sep 2013
Accepted answer

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

8 Comments

mahesh chathuranga on 25 Sep 2013

It gives the error message ??? Undefined function or method 'blockproc' for input arguments of type 'function_handle'.

Error in ==> Untitled at 44 blockyImage8 = blockproc(single(grayImage), blockSize, medianFilterFunction);

Image Analyst on 25 Sep 2013

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 on 25 Sep 2013

I,m working with R2009a,it uses blkproc. but is there any method in matlab to find the old codes.

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