An Improved Wavelet-tree Watermarking on ROI Image for Android Mobile Device s

• Main Authors: LIN, Chun-Yu, 林俊宇
• Other Authors: SU, Chung-Yen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/12702055284377832006

碩士 === 國立臺灣師範大學 === 應用電子科技學系 === 101 === In the paper, we propose a wavelet-tree based digital image watermarking algorithm, and implement it on Android platform as an application. In the past two years, smartphones and tablets have been used widely. Due to the inner high-pixel camera and 3G connecting characteristics of them, lots of personal photographs and illustrations are shared on the internet. Besides, copying digital image and editing it further are quite easy. Therefore, there is a reason to protect digital ownership from illegal declaration after non -authorized people tamper the file. The proposed watermarking improves the embedding method, and offers an effective extraction which is depending on embedding data. According to experimental analysis, the proposed system could improve image quality, and get a better extracting solution for different type watermarks. Moreover, the proposed one has lower computation and high er applicability for image and watermark than the previous method. Finally, the system combines ROI and is implemented on Android OS.