Rate control with delay constraint for screen content coding

Abstract

Different from conventional video, screen content video often contains large movements and abrupt changes between adjacent frames. These distinct characteristics bring great challenges to the implementation of rate control in screen content coding (SCC). This paper proposes a novel rate control scheme for SCC considering the delay constraint. First, a pre-analyzer is designed to collect the information of the proceeding frames, which are about to be encoded. Then, after the information collection, more rational bit allocation strategy is adopted to keep the encoder from both buffer overflow and underflow. Furthermore, a delay constraint condition is derived for buffer and pre-analyzer to avoid additional delay. Experimental results demonstrate that the proposed scheme achieves more accurate rate control accuracy and 3.10 dB gain on average when compared with the existing rate control scheme in HM-16.8+SCM-7.0.