DCT MATLAB watermark source program code
2016-08-23
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Application background
DCT transform domain digital watermarking is a kind of digital watermarking, which has the characteristics of strong robustness and good concealment. The main idea is to select the watermark information in the low frequency coefficients in the DCT transform domain of the image. The reason to choose the low frequency coefficient, because the human eye is mainly concentrated in the process of the damage, the attacker in the process of damage, will inevitably lead to a serious decline in the quality of the image, the general image processing process will not change this part of the data.Key Technology
The main advantage of DCT is that it is applied to the whole image, so it is difficult to be found by the change of the image. On the other hand, when the image is not completely accurate with the power 2 (of power 2). Then there was a small problem. If we use a large number of D (for example, 100) to produce a robust watmatlab
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