摘要
文章提出了一种改进的数字图像扩频水印技术。该算法用两个不相关的伪随机序列分别代表水印信息中的0和1,从而达到扩频的目的,将扩频后的水印信号,嵌入到分块DCT域的中高频段系数中,并利用伪随机序列的相关性实现了水印信息的盲提取。实验仿真表明:图像经过JPEG有损压缩、中值滤波、锐化滤波等图像处理操作后仍然稳健。
The paper proposes an improved spread spectrum watermarking algorithm. Two independent pseudo-random sequence substitute the ‘0＇ and‘1 ＇in the binary image are used, thus achieve the goal of spread spectrum. The modulated signal is embedded in the high-middle frequency band of block DCT. The watermark can get in blind way. The experiments show the proposed algorithm is effective and robust to many common image processing operations, especially to JPEG compression, median filters and sharpening filter.
出处
《计算机与数字工程》
2009年第7期147-150,共4页
Computer & Digital Engineering
关键词
盲水印
扩频技术
DCT变换
相关性
blind watermark, spread spectrum, DCT transform, relevance
