Matlab image processing command

If yes, could you send me the relavant link?
Thank you very much.
Any suggestion.

 采纳的回答

No, you need a bunch of code. JPEG does not simply do a 2D DCT: it breaks the image into blocks, does zig-zag scans, does DCT, and then does other things after the DCT. There is no MATLAB toolbox that does all of the steps to the DCT and quantization and then stops.
You can find some JPEG implementations in MATLAB in the File Exchange.

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Thanks a lot for your answer.
"You can find some JPEG implementations in MATLAB in the File Exchange."
Could you explain more of this sentence? I do know what can I do about "find some JPEG implementations in MATLAB in the File Exchange"
Is there other way to create a quantized DCT coefficients from a jpeg image?
Could you please suggest some reference materials to me?
I check for the following three reference link, but it seems they are not working. http://eeweb.poly.edu/~yao/EE3414/ImageCoding_DCT.pdf

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