divide an image to blocks

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nadia
nadia 2014-10-31
回答： Image Analyst 2014-11-1
hi i have an 256*256 image and i want to divide it to 8*8 blocks without overlapping and then calculate DCT for each blocks. how to do it?please help me
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Geoff Hayes
Geoff Hayes 2014-10-31
Nadia - if you have the Image Processing Toolbox, you should check the example from here DCT with blockproc.

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Image Analyst
Image Analyst 2014-11-1
There are code samples in the FAQ using two different methods, mat2cell() and regular indexing. That just gives you the subimages. You can call a function on them if you want to process each subimage. If you want to use blockproc(), see my attached demos.

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