A Wavelet Domain Digital Image-Watermarking by Double Encryption Based on Arnold Transform and Chaos

摘要

This chapter proposes a wavelet domain digital image-watermarking al gorithm by a double encryption based on Arnold scrambling and chaos. According to this method, the Arnold transform is applied to the original watermark, and the scrambling watermark is again encrypted by the Tent chaotic system. Both cover im age and watermark image are decomposed by the discrete wavelet transform (DWT), the wavelet coefficients of the digital watermark are embedded in the wavelet co efficients of the cover image and obtain the watermarked image. The experimental results indicate that the embedded watermarking is not only invisible and has good robustness against image processing, but also bears very good security.