TURBO码在数字水印鲁棒算法中的应用

Turbo码在低信噪比时具有优异的纠错性能，已经成为通信研究的前沿。一个典型的数字水印系统从原理上可等效为一个通信系统。针对在图像中嵌入大容量水印难度大的问题，提出把Turbo码应用到数字水印系统中，用来提高水印系统的鲁棒性，在算法中采用标志位信息的增强方式，提取秘密信息；采用Turbo码译码方法，以恢复原始的水印。实验结果表明，改进后的方案明显优于原方案，特别是在高斯噪声影响下。

TURBO Codes in Digital Watermark Robust Algorithm Application

The low signal-to-noise ratio Turbo codes have the outstanding error correction performance, and already became the correspondence research front. A typical digital watermark system by theory may be equivalent to a communications system. In view of inserts the large capacity watermark difficulty major problem in the image, proposed applies the Turbo codes in the digital watermark system, uses for to enhance the watermark system robustness, uses the flag bit information in the algorithm the enhancement way, withdraws the secret information; uses the Turbo codes deco- ding method, restores the primitive watermark. The experimental result indicated that, specially under the Gauss noise influence, after the improvement plan obviously surpasses the original plan.