Robust and Fragile Watermarking in MPEG-2 Videos

• Main Authors: Ying-Ru Chen, 陳瀅如
• Other Authors: Shen-Chan Tai
• Format: Others
• Language: en_US
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/q4bh5e

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 90 === This Thesis brings up a digital watermarking system that can protect the author’s intellectual property rights (IPR) and the user’s right at the same time. We embed the author’s identification data into the Y component of the uncompressed video sequence and hide the data, which is used to protect the compressed MEPG-2 video, into motion vectors in MEPG-2 bitstream. Traditional video watermarking method cannot reach the requirements of robustness and fragility at the same time. Our robust watermarking is assisted by HVS and embedded into the wavelet coefficients of the frame. The watermark, which is used to protect the completeness of the video, is first encrypted by cryptology and then hided into certain macroblocks’ motion vectors. The simulation results show that our robust watermark can against intentional attacks, such as video sequence recompression, frame blurring, frame cropping, frame noising, frame sharpening, and frame filtering. Additionally, any video content modification would change the motion vectors and destroy the fragile watermarks. When fragile watermark detection process cannot detect fragile watermarks, system alarms the users the video is destroyed by some pirates.