The Digital Information Encryption System by Infrared Detection

• Main Authors: Chia-Long Chang, 張家龍
• Other Authors: Hsi-Chun Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/5532g7

碩士 === 國立臺灣師範大學 === 圖文傳播學系 === 96 === The objective of this research is to propose a method for inkjet printing to build anti-counterfeiting features by infrared detection. The multiple anti-counterfeiting watermark is constructed by digital halftoning techniques and the characteristics of ink materials. The method also provides many value-added applications for ink-jet printing process. Since carbon black absorbs infrared light, The research demonstrate that the latent information of watermark can be observed and verified under infrared light. The watermark is designed as a form of 2D barcode. The result that binary watermark has error correction capability by BCH error correction code. Digital halftoning technique and the threshold matrix are used to generate the watermarked printed image. The suitable image combination of gray patches by black and Cyan, Magenta and yellow patches are selected. The integrated design of an ID card is successfully implemented. The method achieve the purpose to declare copyright on the basis of the digital watermark. The results show that the watermark can be detected either by an infrared camera or by a copy machine and to withstand the noise attack.