Digital Watermarking Algorithm Based on Chaotic and Wavelet Transform

To protect the copyright of multimedia data effectively, the adaptive digital watermarking algorithm is presented in this paper, which based on chaotic sequence and two-dimensional wavelet transform. Firstly, a chaotic sequence generated by Logistic chaotic map is utilized to encrypt watermark image. Then the strength and position of watermark embedding are obtained by discrete wavelet transform of host image. Finally the encrypted watermark is embedded in the host image. The experimental results show this method has better effect: the watermark is invisibility and robust against common image. It can protect multimedia data effectively.