基于最佳正弦伪随机序列的数字水印技术

论文提出了一种新的具有一定扩充性,以最佳正弦伪随机序列为水印信号的公开数字水印算法。论文先讨论了水印信号设计上应注意的问题;然后描述了最佳正弦伪随机序列的创建方法和性质;并提出了根据水印信号自身良好的自相关特性设计的水印算法;最后对算法进行抗攻击试验并对算法本身进行了简单的讨论。采用最佳正弦伪随机序列为水印信号,保证了水印信号自身具有很高的隐蔽性和信号的唯一性;同时还保证了信号具有很强的抗干扰能力。实验证明该水印算法对于噪声干扰和各种常规图像处理具有良好的鲁棒性。

A Digital Watermarking Algorithm Based on Optimal Sine Pseudorandom Sequences

A new expandable algorithm based on optimal sine pseudorandom sequence for digital image watermarking is proposed in this paper.First,it points out the shortcoming existed in some algorithms that adopt an image as watermarking.Watermarking adopted a image may loss the unconspicuous and uniqueness of watermarking.So it considers that extractive easily pseudorandom sequences act as the watermarking is good.And the optimal sine pseudorandom is adopted as watermarking in the algorithm.Then it describes the feature of optimal sine pseudorandom sequence,and propose s the sequence' s construction method.Second the algorithm is discussed in detail.Finally,it tests the robust of algorithm by the experiment.The result of experiment shows that the watermarking is unconspicuous,uniqueness and abstracted because of the good cross-correlatation character of watermarking.The results also show that the algorithm is robust enough against the noise and attacks of the commonly used image processing methods.