Image Watermarking Processes on Cloud For Physical Object Technology Research

• Main Authors: Chun-Long Wu, 吳春隆
• Other Authors: Wei-Ming Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/b8v6rx

碩士 === 國立宜蘭大學 === 資訊工程研究所碩士班 === 101 === In recent years, the internet technology has changed with each passing day, people can get digital information resource on internet easily. That is why the problem of information security has become more and more important. In traditional way, we usually use watermarking algorithm to protect digital information. It is also the most popular algorithm in recent years. But, for image digital information, we usually use them in physical way. Like movie posts, coupons. Now, it is age of smartphone users. If we can through smartphone’s camera to get information from watermarking, then one watermarked physical image can tells more and more information than one normal physical image. In this research will face on many distortion problems. First, printer has Dithering Distortion, Resolution Distortion, Color Distortion. Second, smartphone’s camera has Resolution Distortion, Color Distortion, Geometrical Distortion, Compression Distortion, Low-Pass Filter. After all distortion then still can decode information in watermarking is the most important point in this research.