divide an image to blocks

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nadia 2014-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/160827-divide-an-image-to-blocks

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 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 2014-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/160827-divide-an-image-to-blocks#answer_157353

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.