Which Dct Algorithm is used ?

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marie lasz 2019-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/495685-which-dct-algorithm-is-used

评论： marie lasz 2019-12-10

Hello,

Can anyone tell me that which algo is used in this dct watermarking code or anyone who already used that code? Here is the link

https://nl.mathworks.com/matlabcentral/fileexchange/46866-watermark-dct

Thanks in advance!

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Answer 1

Walter Roberson 2019-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/495685-which-dct-algorithm-is-used#answer_405542

https://www.mathworks.com/help/images/ref/dct2.html#d117e44015 describes the Discrete Cosine Transfer

dct2 does dct(), transposes the array, and does dct() again.

dct() that is invoked is a private function, not the public dct from the signal processing toolbox. However, the two use the same internal structure; fft() and multiply by weights.

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marie lasz 2019-12-10

Thanks for your response and I know that watermarking is performed here in dct domain but I don't know the complete algorithm? Or which research paper is followed?

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