Watermarking Scheme Based on Multiple Chaotic Maps

Document Type : Research Paper


University of Sistan and Baluchestan


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