Research Based on H.264/AVC Rate Control Algorithm
Abstract
In order to take full advantage of network resources, ensure optimum visual quality and try to avoid network congestion, rate control mechanism is paid more attention in compressed video transmission systems to make balance the bandwidth and quality. Firstly the reason of using Rate Control is introduced. In addition, H.264/AVC video compression standard and common rate control mechanism are involved. Then JM10.1 rate control algorithm is investigated, the structural levels of the algorithm is analyzed and its flow chart is given. What’s more, aiming at the shortcoming of frame layer rate control on its bits allocation, an improved frame layer rate control algorithm is introduced considering the relative complexity of the current picture: the frames of higher complexity are quantized with smaller parameter to improve image quality, while the frames of lower relative complexity are quantized with bigger parameter to save bits, which is done striving to make a group of pictures with stable image quality. Finally the improved algorithm is said with VC code, and performed on JM10.1 experimental platform. The simulation shows that the introduced algorithm makes the output image PSNR a slight increase. The improved algorithm needs further study.
