【摘要】 数字水印是保护数字产品的知识产权有效手段之一,用户通过在产品中嵌入秘密信息来达到保护的目的。提出了基于小波和混沌映射的函数水印算法,该算法利用用户定义的函数作为水印,通过小波变换嵌入到小波的高频区域,嵌入位置可由用户给定,位置信息由Logistic混沌算法加密后发给使用方,使用方在得到密钥和加密的位置序列后方可提取水印,通过对水印的相似度分析确定水印的正确性。实验表明,算法对用户使用方便、快捷,嵌入的水印透明度好,对于常见的攻击如压缩、加噪和剪裁等提取水印的相似度大于95%,具有良好的抗攻击性。更多还原

【Abstract】 Digital watermarking is one of the efficient ways to protect intelligent right.A novel functional watermarking algorithm is presented,which is based on wavelet transform and chaotic map.The watermarking is embedded in the high frequency domain of wavelet and its location is decided by the user.The location information is encrypted with Logistic algorithm and then sent to the receiver.The receiver can detect the watermarking using the key and decide the correctness of the watermarking through similarity analysis.Experiment result shows that the algorithm features fast speed and convenient to use;the watermarking is invisible and the watermarking similarity is greater than 95% for the common attacks such as adding noise,cropping and pressing.更多还原