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SVD and DWT zero-bit watermarking algorithm

The zero-bit watermarking technique uses the feature of images to generate watermarks to be authenticator of the digital multimedia, and makes host media without any distortion. It is highly desired in quality-sensitivity imagery, such as medical images and legal images, where even the small distortion introduced by embedding watermark is unacceptable. In this paper, we propose a zero-bit watermarking algorithm based on singular value decomposition (SVD) and digital wavelet transform (DWT). The host image is firstly performed by DWT, and then divided into non-overlap blocks. SVD factorization is performed on each block. Watermarks are generated by comprising the singular value of different block. Experimental results support that our method has strong robustness.