H.264 video watermarking with secret image sharing

• Main Authors: Chin-Jen Lai, 賴致仁
• Other Authors: Wei-Ming Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/78848435908125686563

碩士 === 國立宜蘭大學 === 資訊工程研究所碩士班 === 96 === H.264 is a new advanced standard. The applications of video on Internet or wireless networks become very popular nowadays. However, these digital contents can be easily modified and copied by end users. Hence copyright protection, copy control and integrity verification has become important issues in recent years. Digital watermarking is a means of claiming ownership of a data source. Therefore, digital watermarking can solve the problem. In the proposed system, watermark will be through pre-processing. In order to enhance security of system, our system used Torus Automorphisms to encrypt the watermark first. Afterward the encrypted watermark used Secret Image Sharing technology to produce several sharing image. The sharing image embedded different I Frame respectively. Our system compute the energy of block which the I Frame after transformed and quantized. We design embedding algorithm for high energy block and low energy block respectively. Each pixel of the watermark is to decide singular values of mapped block which be calculate by Singular Value Decomposition (SVD). The experimental results demonstrate, the proposed algorithm can robustly survive common image processing, such as gaussian noise, mean filter etc. Our system can extract the watermark without original video sequence. The watermark pre-processing enhanced security of our system.