分形数字水印鲁棒性能的改进

将概率统计的知识与传统的基于分形图像编码的数字水印技术的结合起来，给出了一种更为优化的数字水印技术。由于这种数字水印技术的密匙是嵌入水印信息的值域子块的位置，因此可以选择多组值域子块，重复嵌入水印信息，而在提取水印时，对由每一组值域子块所获得的水印信息进行概率统计，根据概率的大小判定水印信息。实验结果表明：该方法在很大程度上提高了水印的鲁棒性。

Robustness Improvement of A Digital Watermark Based on FIC

A novel way of watermarking technique is proposed based on fractal image coding (FIC) by combining the traditional way with the theory of probability and statistics. Because the secret key of the watermarking technique is the locations of the range blocks embedding digital watermark, we can choose many groups of range blocks to be embedded with the digital watermark repeatedly. When retrieving the digital watermarking, we can judge its content by statistical analysis of the information obtained from the given range blocks. Experimental results show that using this way, we can improve the robustness of the digital watermarking to a great extent.