Study of digital watermark based on chaos algorithm

A chaos-based LSB watermarking algorithm is proposed in this paper, which is based on traditional LSB watermarking. This method adopts Logistic Chaos-Map to generate sequence, and then construct watermark embedded in the image. This algorithm greatly enriches the types of watermark and simplifies initial conditions of constructing watermarks. At the same time, an improved Patchwork watermarking algorithm is presented which is based on multiple sets. This arithmetic uses binary or multiply chaotic sequence to divide carrier images. At last, this paper introduces the multiwatermarking of colourful image based on chaos algorithm.