摘要
不可见性是图像隐形水印最基本的要求之一,它的客观标准是水印图像的信噪比。根据这个标准,提出了一种基于小波的以彩色图像为水印的自适应水印算法:根据需要的水印图像三基色的信噪比,对于不同的彩色宿主图像和彩色水印,都能够完全自适应地选择三基色各自的水印嵌入强度值w。试验结果表明该算法能够自动实现所要求的水印图像信噪比,水印具有较强的稳健性。该算法可以使每幅图像在不可见性(PSNR)和鲁棒性(参数w)间都能自然地达到最大程度的平衡,实用性较强。
Sightlessness is one of the most basic requirements for invisible watermarks and its impersonal criterion is signal - to- noise ratio of watermarked image. Based on this criterion, an adaptive color watermark algorithm is proposed based on DWT domain in this paper： according to demanded signal - to- noise ratio of RGB watermarked image, embedding intensity of RGB is chosen automatically despite of different color host images and watermarks. Experiments show that the algorithm is able to meet the required PSNR and performances of the proposed watermarking are good at robustness. The algorithm makes each image be watermarked naturally to an extent where maximum level of trade-off between invisibility （PSNR value） and robustness （parameter w ） is achieved and it is very useful.
出处
《计算机技术与发展》
2010年第2期160-162,166,共4页
Computer Technology and Development
基金
安徽高等学校省级自然科学研究项目(KJ2009B123)
关键词
信息安全
小波
自适应嵌入
信噪比
information security
wavelet
adaptive embedding
signal- to-noise ratio
