A New Semi-Fragile Watermarking Technique for Image Authentication
出版社：
- 会议名称：The Seventh International Conference on Signal Processing （ICSP 2004）
- 举办地点：Beijing,China
- 举办日期：2004
- 页数：32-45
摘要内容：
Semi-fragile watermarking techniques aim at de-tecting malicious manipulations on an image, while allowingacceptable manipulations such as lossy compression. Althoughboth of these manipulations are considered to be pixel valuechanges, semi-fragile watermarks should be sensitive to maliciousmanipulations but robust to the degradation introduced by lossycompression and other de?ned acceptable manipulations. In thispaper, after studying the characteristics of both natural imagesand malicious manipulations, we propose two new semi-fragileauthentication techniques robust against lossy compression, usingrandom bias and nonuniform quantization, to improve the perfor-mance of the methods proposed by Lin and Chang.
关键词：
- JPEG2000；nonuniform quantization；random bias；semi-fragile watermark；wavelet transform
