A Basic-unit Size Based Adaptive Rate Control Algorithm
基于单元尺度的自适应码率控制算法

With the rapid development of information technology,compress coding has become a heated topic in the field of multimedia storage and transmission.Aiming at the coding efficiency of video compression,ITU-T and ISO/IEC jointly developed a new video coding standard named H.264/AVC in 2003.In order to transmit video efficiently on certain bandwidth,the rate fluctuation should be controlled to make it as close to the target bandwidth as possible.Although rate-control is not a part of the standard,it has been playing an important role in the standard all the time.For this purpose,on the basis of JVT-G012 algorithm,a new rate-control algorithm based on Spatial-Temporal Gradient Scale(STGS) image is presented for H.264/AVC coding to select the size of basic-unit adaptively.The rate fluctuation resulted from the proposed algorithm is always close to the best case of JVT-G012 algorithm.Moreover,for the low computational complexity,the proposed algorithm is easy to implement in real time applications.