基于扩频技术的图像盲水印

Blind watermarking based on spread spectrum technique

在分析数字水印和扩频通信联系的基础上,提出了一种基于扩频技术的盲水印方法.该方法使用宿主图像的两块DCT变换系数块中嵌入一位水印信息,通过量化使它们呈现足够大的统计差别,从而使水印检测时能提取水印信息.实验结果表明:该方法水印有较好的不可视性和鲁棒性,检测水印的虚警概率很低.

The relation between the digital watermarking and spread spectrum communication is analyzed at first ,then a blind watermarking method based on spread spectrum technique is put forward. With this method, each watermark bit is embedded using two DCT coefficient blocks of host image, The blocks are so quantized that they exhibit a large enough statistical difference which will later be used for watermark extraction. Experiment results show that the watermarking is invisible and robust and that the checking probability of false positive error is very low in this proposed scheme.