anyone suggest me a code for dct2() and blockproc()

i take one image with any kind of size. for that image how to apply 8x8 dct. anyone suggest me what is the code for this?

 采纳的回答

Hi, You should have just continued the post that you started here:
Did you read the help for dct2() and blockproc()?
fun = @(block_struct) dct2(block_struct.data);
RGB = imread('autumn.tif');
I = rgb2gray(RGB);
Y = blockproc(I,[8 8],fun);

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