Research on the computation model of macro block coding based on the rate-distortion optimization

Abstract

For the coding bit-rate control problem on the H.264 wireless video communication, on the basis of in-depth rate-distortion theory analysis, this paper researches current common rate distortion computation model, establish the relationship between the total distortion statistics measurement, the coding bit-rate measurement, the quantization parameter and the macro block intra frame refresh rate, and put forward new associated error control and code-rate control thinking. This method not only can acquire the optimal control point in the rate-distortion curve from the global perspective under the code error environment, but also can self-adaptive adjust the bit allocation and the quantization parameter under given network bandwidth. Furthermore, it can also implement intra frame macro block refresh at the same time and play important role in counteracting the channel code error to minimize the total distortion under certain bit-rated according to current network package loss probability, by which to establish the rate-distortion model of associated signal source channel and apply the rate-distortion optimized solution method to optimal allocate the bit-rate between the signal source coding and the channel coding. This method can provide valuable reference for the video robust coding transmission and resource allocation under the wireless environment.