一种Contourlet变换域彩色图像数字水印算法

摘要

As an important means of copyright protection,digital watermarking technology has been widely used,but the practical watermark algorithm is scant,especially the relevant algorithm of color image and video image processing. Taking fully into account of the characteristics of human visual system,a binary watermark image is embedded into the low frequency compo-nent(after DWT transform)of the protected image in the color space according to the feature of carrier image,the quantity of the embedded binary watermark information can be adaptively increased according to the actual requirement. Based on the digi-tal watermark embedding algorithm research in Contourlet domain,the embedded process and watermark extraction process of the algorithm are implemented through Matlab software emulation. The emulation result proves that the proposed algorithm can improve the practical application of digital watermarking technology in the real life.%数字水印技术作为版权保护的一种有效手段,在信息安全领域已有一定的实际应用,但实用性的水印算法还较少,特别是与彩色图像及视频图像处理的相关算法凤毛麟角.依靠人类的视觉敏感特性,在彩色图像空间上将一幅二值水印图像根据载体图像的特征,选择性的嵌入到受保护图像的DWT变换后的低频分量中,所嵌入的二值水印信息量可以根据实际需要自适应的增加.在Contourlet域水印的嵌入算法研究基础上,提出并通过Matlab软件仿真完成算法的嵌入过程和水印提取过程.仿真实验证明所提出的算法能够有效提高数字水印技术在现实生活中的实际应用.