Improved watermarking algorithm of odd-even based on chaotic map

An improved watermarking algorithm of odd-even quantification based on chaotic map is proposed.Firstly,the binary watermark image is scrambled by chaotic sequence.Then the position of the image blocks and wavelet coefficients are determined by processed sequences.The disorder watermark bits are embedded into the original image using odd-even quantification.By taking full advantage of the masking characteristics of the human visual system and the adjustment of quantification steps according to the original image,the adaptation is ensured.Finally,by making the best use of the characteristics of the discrete wavelet transform,the signal is embedded in the middle frequency bands.The experimental results show that the proposed algorithm is invisible and robust to image processing operations.