.Watermarking scheme of colour image based on chaotic sequences[J].Optoelectronics Letters,2009,5(3):227-231 Watermarking scheme of colour image based on chaotic sequences 刘年生  郭东辉 LIU Nian-sheng(School of Computer Engineering, Jimei University, Xiamen 361021, China) ;GUO Dong-hui(School of Information Science and Technology, Xiamen University, Xiamen 361021, China) ? Abstract:       The proposed perceptual mask is based on the singularity of cover image and matches very well with the properties of the human visual system. The cover colour image is decomposed into several subbands by the wavelet transform. The water-mark composed of chaotic sequence and the covert image is embedded into the subband with the largest energy. The chaos system plays an important role in the security invisibility and robustness of the proposed scheme. The parameter and initial state of chaos system can directly influence the generation of watermark information as a key. Moreover, the watermark information has the property of spread spectrum signal by chaotic sequence to improve the invisibility and security of watermarked image. Experimental results and comparisons with other watermarking techniques prove that the proposed algorithm is effective and feasible, and improves the security, invisibility and robustness of watermarking information. Hits: 3739 Download times: 229 View Full Text    Download reader