Adaptive Intra Refresh for Screen Content Video Transmission in Dynamic Network

Screen content video has been widely used in teleconferencing, cloud gaming, screen sharing, etc. In order to improve the compression efficiency of screen content video, the international standards organization developed the extended screen content coding standard (HEVC-SCC). However, high compression rates may also cause serious information loss when transmission error occurs, degrading the quality of received video. To tackle this problem, this paper proposes an adaptive intra refresh strategy for screen content video transmission. Firstly, the intra refresh optimization problem is mathematically modeled considering error propagation and error concealment. Next, the optimization problem is simplified based on the quantization mechanism, and the optimal solution of the optimization problem is obtained using the offline training method. Then, the buffer control is designed to reduce the transmission delay. Finally, experimental results show that compared with the original HEVC-SCC encoding method, the proposed algorithm could averagely improve the rate-distortion performance by 14.12%, and significantly improve the subjective quality of the received video.