摘要
基于邻域中象素的相关性 ,提出一种将水印嵌入数字图像的空域的公开水印技术 .首先 ,在图像的空域中 ,用密钥随机地选取一些图像象素及它们的邻域 ,并将邻域中的象素排序 ;然后 ,通过调整被选象素与邻域中其它象素的大小关系来隐藏水印信息 .为了提高水印的稳健性 ,将其重复嵌入 .实验结果表明 ,文中方法对通常的图像处理操作是稳健的 .特别地 ,当JPEG压缩比达 1∶13时 。
Based on the coherence among neighborhood pixels, a public method to embed watermark into spatial domain of an image is proposed. Some pixels and their neighborhood are randomly selected using a secret key, and pixels in each neighborhood are sorted. Then, a bit of the watermark is embedded by adjusting the relation between the selected pixel and other neighborhood pixels. For improving robustness, the watermark is embedded repeatedly. Experimental results show that the proposed technique is robust to common image processing operation. Especially, the extracted watermark is still recognizable when the JPEG compression ratio reaches 1∶13.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2002年第4期365-368,共4页
Journal of Computer-Aided Design & Computer Graphics
基金
广东自然科学基金 ( 980 2 5 7)
