How do we extract an mn matrix from a larger pq matrix?

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Chandvi Arora 2017-7-20

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评论： Chandvi Arora 2017-7-20

I have an image which is divided into 8*8 blocks grid. I am finding DCT of each block in this image using blocproc which is followed by idct. This gives me idct of the entire image(a matrix of 512*512 is obtained). How do I extract dct of one block(i.e. dct of a single block out of 512*512 blocks) to obtain a 8*8 matrix out of 512*512 one.

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Rik 2017-7-20

With block=total(1:8,1:8);?

Chandvi Arora 2017-7-20

I am able to do what I want with this. Thanks a lot.

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KSSV 2017-7-20

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This question is asked multiple times:

https://in.mathworks.com/matlabcentral/answers/328673-how-to-divide-rgb-image-into-blocks-using-for-loop-and-find-the-rgb-value-for-each-block

https://in.mathworks.com/matlabcentral/answers/89757-how-to-divide-256x256-matrix-into-sixteen-16x16-blocks

http://in.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-inarray-varargin-

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Chandvi Arora 2017-7-20

In the last link, how to determine the value of [20x6x3 double]? I need the exact value.

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Image Processing and Computer Vision Image Processing Toolbox Image Filtering and Enhancement Neighborhood and Block Processing

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