I am getting error as follows how to solve it?
??? Subscripted assignment dimension mismatch.
Error in ==> blkproc at 89 aa(border(1)+(1:ma),border(2)+(1:na)) = a;
Error in ==> func_DCTJPEG at 35 Coef=blkproc(ImageSub,[8,8],'dct2(OriginalImage)');
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This solution http://www.mathworks.com/support/solutions/en/data/1-FA7L9M/?solution=1-FA7L9M explains the reason for the error message. In short, you are trying to execute something which shouldn't be allowed.
Check your code again:
Coef = blkproc(ImageSub, [8,8], 'dct2(OriginalImage)');
The provided function is a string, but blkproc expects a function handle. How could Matlab know, what "OriginalImage" is?
Please post the relevant part of the code to allow a more explicit help.