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histogram equalisation fro jpeg

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heab

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blkproc dct2

How can I use MATLAB for do the DCT(sub-block 8x8) with the image (512x512)?
 

Re: DCT (jpeg)

Yes, in the signal processing tool box there is a function of DCT ...
 

    H

    heab

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Re: DCT (jpeg)

Read the Discrete Cosine Transform topic in the image processing toolbox help
[8-16]and there is an example of 8x8 dct.

The dct2 function in the Image Processing Toolbox computes the two-dimensional discrete cosine transform (DCT) of an image.

-Best Regards
 

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    heab

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Re: DCT (jpeg)

Hi
Yes of course, a good matlab command in this area is blkproc and see matlab example in this area:
I = imread('cameraman.tif');
fun = @dct2;
J = blkproc(I,[8 8],fun);
imagesc(J), colormap(hot)
 

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    heab

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