A Combination of DCT -based and SVD -based Watermarking Algorithm
Xinzhi Wu · Science and Technology of West China · 2008
A new watermarking algorithm for digital image base on DCT and SVD is proposed in this paper,which combines both merits of discrete cosine transform(DCT)and singular value decomposition(SVD).The conflict between transparence and robustness of the watermark system is better solved by the algorithm.In the scheme,the embedded watermarking images are gray images which are scrambled,thereby increasing embedded information capacity and guaranting the safety of data.Experimental results show that the new watermarking scheme has a good transparence of embedded watermark image and is robust against attacks such as adding noise,filtering,JPEG compression and geometric distortion.