A low complexity macroblock layer rate control scheme base on weighted-window for H.264 encoder

Abstract

Rate control plays a very important role in video coding. A low complexity macroblock (MB) layer rate control scheme for H.264 encoder is presented in this paper. Based on the analysis of the relationship among the quantization parameter (QP), mean absolute distortion (MAD) and the coded bits, a weighted-window model is proposed. A weighted-window based QP decision and MAD prediction model is proposed to reduce the computational complexity of MB-layer rate control. A new rate control scheme based on these models is presented in detail. The experimental results show that the proposed scheme gives a quality improvement of about 0.80dB on the average for all sequences, and about 58% reduction in bit rate mismatch. © 2012 Springer-Verlag.