RST Invariant Image Watermarking Scheme Based on DWT-SVD and Logistic Mapfull text in English

摘要

A new robust RST invariant image watermarking scheme is presented by using discrete wavelet transform(DWT), singular value decomposition (SVD) and logistic map for image authorization. For watermarkembedding, the original host image is transformed into wavelet domain, and then the visually meaningfulgrayscale watermark encrypted by the introduced two-dimensional logistic map is embedded into the lowfrequency subband image by modifying the singular values of the low frequency subband with the singularvalues of the watermark. In extraction process, the singular values of the extracted watermark are estimatedand rearranged by descendant as well as set the negative to zero. Experimental results demonstrate that theproposed scheme has a good robustness to not only the rotation, scaling and translation attacks, but also somecommon image processing operations such as cropping, noise, filtering, and compression and so on.