Research Of The H.264 Video Coding Error Control Technology In Wireless Transmission

As wireless communication technology's rapid development. The wireless network bandwidth has been greatly improved; making the wireless mobile multimedia transmission became possible. Vision as the main information acquisition way of the human, decided the video communication will become the future of the core communications business. But, compared to the cable channel, there is still a high error rate, poor-quality transmission of the fatal defects in the wireless channel has brought enormous challenge to the video transmission.In order to save network resources, all kinds of video encoding technologies compressed information redundancy greatly to reduce the amount of data required for transmission. On the one hand video compress technology make less data need to be transmitted, on the other hand, because reduce the correlation between the data, the effect of error, which made in transmission, to the video quality increased. So in video encoding technology, error control and hide technology has an important possision.As wireless channel high error rate and packet loss rate of the inherent characteristics of wireless data communications under the reliability lower than the cable channel. This environment of the wireless channel request video coding's error control to be more efficiency.H.264 video encoding technology to accurately predict the video information in both the time and space field, it's get much higher compression rate than the previous video coding technology, and makes the low rate of the video transmission possible. In error control, except use proved effective approach, H.264 adds many new technologies, such as the set of parameters, redundancy slice and flexible macroblock ordering.The main research and work of this paper include several aspects as follows:(1) Study the error control technology of wireless video encoding and transmission system.(2) Analysis Intra and Inter prediction process of the H.264 video encoding technology, and what effect will bring to the error happened in the communication.(3) Studies the current error control technology used in the H.264 video encoding technology, and analysis the effectiveness and practicality of them.(4) In consider of the wireless environment and network bandwidth limitations of terminal equipments, select the low decoder complexity and channel conditions require flexible slice ordering technology as study points. Proposes an improved method based on FMO's (Flexible Macroblock Ordering) explicit mod. In the coding process, according to the characteristics of the image's Macroblocks updated the MBAmap, in order to achieve redress the Slice Group to adaptive changes of the image.(5) Analog wireless channel transmission characteristics of simulation tests proposes method, and compare it's anti-error performance and coding efficiency with original method.