I want to find DCT of a gray scale image. How to do it?

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Chandvi Arora 2017-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/349341-i-want-to-find-dct-of-a-gray-scale-image-how-to-do-it

评论： Deo Kelvin 2021-12-28

采纳的回答： Walter Roberson

The gray scale image is divided into 8*8 blocks. How to find DCT of EACH 8*8 block and display dct of one block? Further, how to quantize the dct of each block?

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Chandvi Arora 2017-7-19

And what is the diiference between dctmtx and blockprocing the dct statement?

Deo Kelvin 2021-12-28

hello..can I ask for your coding? I am new to Matlab and my problem is the same as yours. You can send it to my email febbyfitri28@gmail.com. Thank you in advance, I really appreciate your kindness. @Chandvi Arora

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Walter Roberson 2017-7-19

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blockproc() the dct2() call.

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Chandvi Arora 2017-7-20

编辑：Chandvi Arora 2017-7-20

output.png

C = blockproc(grayImage, [8 8], @(block) dct2(block.data)); This statement gives an output as in the attached image. please guide me through.

Walter Roberson 2017-7-20

在 MATLAB Online 中打开

iC = blockproc(C, [8 8], @(block) idct2(block.data));

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

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