Layered Protection of Scalable Media using Perceptually Removable Watermarks

• Main Authors: Yu-Cheng Chu, 朱育成
• Other Authors: Hsueh-Ming Hang
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/rw3p4z

碩士 === 國立交通大學 === 電子工程系所 === 95 === With the widespread use of Internet, digital multimedia data are easy to access. Therefore, a protection scheme is needed to secure the intellectual property. On the other hand, scalable media coding becomes more and more important due to the varying bandwidth in transmission such as mobile communication. Hence, a layered protection scheme of scalable media was proposed. It is a scheme which protects data of each layer by cryptosystem and the decoding key of the current layer is carried by the watermark embedded in the previous layer. In this thesis, our goal is to design and implement the layered protection scheme for the SNR and the spatial scalable media. Thus, the JPEG2000 still image compression standard, which provides content formats for SNR and spatial scalabilities, is used as the platform in our implementation. To fulfill all the requirements in our system, the perceptually removable watermarking (PRW) is chosen for carrying the decoding keys. The specifically designed PRW embeds the watermark with high intensity to increase the data capacity, and it can be removed at the other end with virtually no loss on image quality. With the aid of the PRW, the layered protection scheme for SNR and spatial scalability can be successfully implemented.