An RST invariant image watermarking scheme using DWT-SVD

摘要

Many digital image watermarking schemes are sensitive to geometric attacks. In this paper, we present an RST invariant watermarking scheme using DWT-SVD and logistic map in which the watermark is a visually meaningful grayscale logo. The embedding is done by modifying the singular values of the approximation subband of the host image with logistic map encrypted watermark, and then the watermarked image is reconstituted. The extraction is basically the inverse process of the embedding. Experiment results demonstrate the proposed scheme is able to withstand a variety of geometric attacks and some common signal processing such as additive noise.