Spread Spectrum Watermarking Scheme Based on Chaos Scramble and Hybrid Transform Domains
Wen Qiang Xu · 2007
In this paper, a robust spread spectrum digital watermarking algorithm based on chaos scramble and hybrid transform domains is proposed. Firstly, in order to enhance the security of the watermarking, the original meaningful binary image digital watermarking is scrambled by using Arnold transform. Then the scrambled watermarking is spread by using spread spectrum technology. Taking into account the characteristics of human visual system (HVS, the positions and strengths of embedding into coefficients of the hybrid DWT and DCT domain are obtained. Selecting spread spectrum gain factor is determined by chosen coefficients of hybrid DWT and DCT domain and watermarking size. The experimental results show that the presented chaos scramble and hybrid transform based spread spectrum digital watermarking algorithm is more secure and robust against geometric distortions (such as cropping, rotating and so on and general image processing operations(such as adding Gaussian noise, JPEG glossy compression, filters. Though the quality of the watermarked image is seriously degraded because of the attacks , the watermarking can be extracted very well.