基于混沌的织锦图案彩色分量水印嵌入算法

Watermarking Algorithm of Color Components Based on Brocade Design of Chaos

数字水印作为图像版权保护和内容认证已成为多媒体信息安全研究领域的一个热点。利用混沌序列对图像信号加密和解密的方法,给出了基于混沌特性的彩色图像数字水印算法,该算法选择彩色图像的YIQ色彩空间,将原始图像Y分量进行二级离散小波变换(DWT),水印图像进行一维Logistic置乱加密后嵌入到原始图像Y分量的低频子带中,其算法具有水印嵌入信息量大和隐蔽性好的特性。实验结果表明,算法对滤波、剪切和噪声攻击具有较强的鲁棒性。

Digital watermarking becomes a focus in the study of copyright protection and authentication of multimedia information security.The way to encrypt and decrypt graphic signal was discussed by chaos sequence theory.A chaos-based digital watermarking embedding algorithm was proposed for color image.The original color image was transformed into the YIQ color space,its component Y was decomposed by a two-level discrete wavelet transform.The watermark image was embedded into low frequency sub-band of component Y after 1-dimensional Logistic scrambling and encrypting.The algorithm can contain more embedding intensity and be invisible.The experimental results verify the algorithm′s robustness for filtration,crop procession and noise attacking.