摘要
数字技术的发展,以数字方式存储的多媒体信息越来越容易被篡改,传统手段应用在数字多媒体的保护中缺点显现.提出一种新的用于数字图像篡改证明的小波域脆弱水印算法.算法中引入了人眼视觉模型,使得算法有好的视觉隐蔽性.同时,该算法很好的克服了之前数字水印算法对篡改的综合分析能力弱的缺陷.此外,该算法能够用于多灰度级图像水印的嵌入.以嵌入多灰度级水印的数字图像为对象,对频域改动分析和局部空间篡改检测的试验结果都表明该方案是行之有效的.
As a great deal of multimedia is stored in the form of digital format, they are becoming easier to be modified and forged. The shortcomings of traditional protection methods used in the digital multimedia appear. In this paper, a novel fragile wavelet-based image watermarking algorithm for tamper-proofing of data image is proposed. By utilizing the just noticeable distortion （JND） values, the transparency of the hidden watermark can be guaranteed. The limitation of synthetical analysis in the other proposed watermarking algorithms for tamper-proofing previous is amended. Furthermore, it can be embedded in a multilevel gray image. Some experiments show that this algorithm is effective in detecting changes in the local space and frequency regions in the image.
出处
《浙江工业大学学报》
CAS
2006年第1期97-100,共4页
Journal of Zhejiang University of Technology
关键词
图像水印
小波分解
篡改证明
image watermarking
wavelet decomposition
tamper-proofing
