Watermarking Scheme Based on Multiple Chaotic Maps

Abstract

a watermarking scheme for Grayscale image is<br />proposed based on a family of the chaotic maps and discrete<br />cosine transform. Jacobian Elliptic mapis employed to encrypt of<br />watermarked logo. Piecewise nonlinear chaotic map is also used<br />to determine the location of DCT coefficients for the watermark<br />embedding. The purpose of this algorithm is to improve the<br />shortcoming of watermarking such as small key space and low<br />security. Therefore the size of key space for initial conditions and<br />control parameters is computed about and this key<br />space is large enough to resist the attacks. Toevaluate the<br />robustness and effectiveness of proposed method, several attacks<br />are applied to the