Practical application of chaos-fractal coding to enhance the capacity of image watermarking scheme

The image watermarking technology is a technique of embedding hidden data in an original image. In this paper, a new watermarking method for embedding watermark bits based on chaos-fractal coding is given. A chaotic signal is defined as being deterministic, pseudo periodic and presenting sensitivity to initial conditions. Combining a chaos system with fractal coding plays an important role in the security, invisibility, robustness against adding noise and capacity of the proposed scheme. The main idea of the new proposed algorithm for coding is to determine a set of selective blocks for steady embedding. Simulation results show that the proposed algorithm has a confident capacity. The embedding technique that proposed in this paper is quite general, and can be applied to the extracting scheme with demanded changes. Since the proposed method works without the need to the original image it is of blind nature.