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Image Digital Watermarking Algorithm Based on Double Transforms

SHI Jing1,LIN Ke-zheng1,MAO Jun-jie2(1.College of Computer Science & Technology,Harbin Univ.Sci.Tech.,Harbin 150080,China;2.Dep.of Computer,Beijing University of Technology,Beijing 100022,China)  
In order to embed the watermarking much better,based on DWT,wavelet transform is applied not only in carrier,but also in watermarking images at the same time.Wavelet basis function is simultaneity applied in carrier and watermarking images at first,and then watermarking in their corresponding transform domains embedeled.Being different from the past embedding policies, this algorithm is not only invisible to the image but also enlarging the watermarking quantity.In addition,it can be calculated easily,the watermarking being binary image and also blind semi-fragile watermarking.Finally,it gives a comparison with SWT the latest proposed,and the experiments indicate that the advantages of DWT can't be ignored.
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