why after I use the imwrite function, the pixels in the image are changed diferrent? before I convert from double matrix to uint8 matrix ?

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muhammad isroi
muhammad isroi 2017-11-8
编辑： Looky 2017-11-8
embed1=uint8(blkproc(embed1,[8 8],@idct2));
imwrite(embed1,'embeddct.jpg');
AA=imread('embeddct.jpg');

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回答（1 个）

Looky
Looky 2017-11-8
编辑：Looky 2017-11-8
This is likely a result from the compression/decompression process involved when saving to a jpg file. Choose a better suited file format like '.bmp' if you want the exact equality of saved and loaded data.
imwrite(embed1,'embeddct.bmp');
AA=imread('embeddct.bmp');
Edit: Here is a better explanation of this problem and how to fix it.

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