| DVB-C(Digital Video Broadcasting-Cable) system is a production from programming, signal transmission and processing signals to display completely digital TV system and it consist of computer, communication and electronic technology. Compared with conventional analog television, DVB-C has many advantages which haven't. But the monitoring system of DVB-C is still same with the analog television. It lacks automation way to deal with illegal attack to itself, such as illegal signal insertion attack.Digital watermarking is a new practical information hiding technology, which develops great fast recently. It is an effective way to using digital watermarking to protection multimedia information at home an abroad. Video watermarking is one of digital watermarking technology, which used most widely. This paper analyzes digital watermarking technology and the relevant literature of domestic and international, propose a solution which use video watermarking technology to DVB-C monitoring system in order to solve the problem of automation monitoring.In the monitoring system solution, we proposed a new video watermarking algorithm which is based on replacing the parameter of macro block variable length codeword run field in the compressed video domain. This algorithm doesn't require decoding or encoding of the video stream completely, thus avoiding the high complicated computation of some operations, such as DCT transform and motion compensation, to meet the real-time requirement of video watermarking. In order to achieve video watermarking blind detection, the video watermarking algorithm uses the extended m-sequences as embedded watermark because of the balance property of extended m-sequences adequately to generate a stable reference point. The experiment results show that the algorithm satisfies ht various performance indicators of monitoring system. |
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