A Technique for Image Authentication

• Main Authors: Chung-Wei Tsai, 蔡中瑋
• Other Authors: Yuan-Liang Tang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/12948829473620349269

碩士 === 朝陽科技大學 === 資訊管理系碩士班 === 90 === As digital technologies advance, more and more publications such as digital images and the MP3 music products are produced in the digital format and transmitted through the Internet. Accompanying the advent of such digital world, however, illegal use and copying of digital products become a serious problem. How to protect the right of legal users and the copyright of original producers thus becomes an active research area. Among various technologies for digital product protection, image authentication has received extensive attentions. Researchers have developed a number of methods to identify if an image has experienced illegal modifications. For examples, images can be authenticated by image feature comparison, by digital signatures, and by error control coding. Most of them, however, can only detect if a "portion" of an image is modified, as a tradeoff of simplicity, efficiency, or specific requirements for certain applications. There are very few techniques that can identify image tampering up to one-pixel level. In this research, we will first review current important techniques for digital product protection in general, and then propose a method that is able to locate image tampering up to one-pixel level. This technique is very important if the image content is not allowed for modification, especially when the image is used for legal purposes.