Color Image Watermarking Algorithm Based on DWT-SVD

A novel watermarking scheme of embedding a scrambling watermark into the green component of the color image based on DWT-SVD is proposed. The green component is decomposed for LLn, HLn, LHn, HHn with DWT at the Nth levels. For each subband, adopt different methods to complete the watermark embedding. For the part LLn, imbed pseudo-random after spreading according to the energy. Decompose the three wavelet matrix coefficients LHn, HLn, HHn with SVD. Add the SVD of the scrambled watermarking and the SVD of the wavelet coefficients, and then the imbedding course is accomplished. The retrieving watermark algorithm and the blind detecting algorithm both are designed according to the embedding scheme. The experiment indicates that the watermark is robust to JPEG compression, cropping, Gaussian noise, median filter and resize.