| In recent years, wireless communication has experienced unequalled rapid growth. As one of the most important future service traffic, video communication has been taken into high consideration. The incoming 3G could not only support the existing mobile voice service, but also provide broad band video service and real-time video communication traffic. The latest development in the wireless network makes it possible to transmit video monitoring data through the wireless network. In this paper, we study the wireless mobile video monitoring network system.For a wireless video monitoring system, because of the huge amount of data, and the high requirement for channel bit error rate, and the time-varying capacity and limited band of wireless channel, rate control plays a critical role in video encoder for regulating the coded bit stream to satisfy the channel conditions and keeping the high quality of coded video monitoring data.One main work of this paper is to study the rate control algorithm. Firstly, for the current rate control algorithm of Test Model 5(TM5), it fails to handle scene switch properly. Therefore, a scene switch detection method with less computation and an adaptive rate control algorithm to compensate the visual degradation at scene switch point is put forward. Moreover, an Adaptive Feedback Rate Control (AFRC) algorithm based on F-VBR model is proposed. The coded frame rate, the video bit rate are controlled by several feedback mechanisms, as well as the frames to be coded are chosen according to the content of video. Another main work is to design a wireless mobile video monitoring system in manner of Browser/Server, using the AFRC and CBR rate control algorithm which are put forward before. |
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