一种基于伪序列码的数字水印技术

Algorithm Watermark Based on a Pseudo-Random Sequence Encryption

提出了一种基于伪序列的离散小波变换的数字水印方案.这种方案基于DWT域的图像水印嵌入和提取算法,充分利用了小波变换的时频域特性,并加入一个伪随机序列.检测时,对水印的图像进行塔式分解,通过计算处理每一层取得的所有相关信息.经过试验证明,该算法具有较好的鲁棒性及实用性.

An algorithm of the image watermark based on discrete wavelet transform of pseudo-random se- quence encryption is presented. Based on the image watermark of DWT and the fetch algorithm, the algorithm makes use of greater time frequency of wavelet transform and uses a pseudo-random sequence encryption. As de- tecting the image watermark is separated, all of information is achieved through calculating each level. The ex- periment results indicate that the algorithm possess greater robustness and practical function.