A Multifunctional Watermarking Algorithm for Color Images Based on Chaotic Systems
Liyong Liu · Computer Engineering and Science · 2009
Nowdays embedding only one kind of watermark in digital products can not satisfy people's demand any more,and the multiple or multifunctional watermarks are required in many situations. A space and the DCT field combined watermarking algorithm for color images based on the good randomicity and the initial value sensitivity of chaotic dynamical systems is proposed in this paper. In the algorithm,a fragile watermark based on chaotic random keys and the LSB technique is repeatedly embedded in the blue layer of the color image,which is used for integrality authentication and sophistication detection. At the same time,two robust watermarks are respectively embedded in the red layer's direct current (DC) coefficients and in the green layer's intermediate frequency coefficients of the image's DCT field. These watermarks are used for the copyright authentication and appended information detection,etc. The experimental results show that the algorithm can well realize the multifunctional watermarking method.