提高一类图像数字水印性能的方法

Method of Improvement on Digital Image Watermark Capability

针对一类基于图像分块变换和量化的数字水印技术,提出了以提高水印性能为目标的数字水印方法。该方法从提高水印透明性出发,对水印图像进行行列重排,将水印的优化嵌入归结为一个双排列Procrustes问题,并通过迭代算法获得其近似最优解。实验结果表明,该方法能较大地提高水印的透明性、稳健性、可视性和安全性。

In order to improve watermark capability, this paper proposes a digital watermarking method based on watermark technique of blocked transformation and quantization. With the aim of improving transparence of the embedded watermark, rows and columns of the watermark image are rearranged in this method. Then the optimized watermark embedding turned to be a two-sided permutation Procrustes problem. And the problem can get a local optimized solution via an iteration method presented in this paper. Experimental results show that this algorithm can improve transparence, robustness, visualization and security of the watermark.