A High-speed Lossless Intra Reference Block Recompression Method for Bandwidth Reduction in Video Coding

In screen content coding (SCC) tools, Intra Block Copy (IBC) is one of the key technologies. However, this technology, which greatly increases the coding efficiency, aggravates the bandwidth consumption in high efficiency video coding (HEVC) and needs too much storage resources. Some papers have proposed their own compression algorithms to solve this problem. Their algorithms have the problem that compression efficiency and encoding speed cannot be achieved at the same time. In this paper, we speed up existing reference frame compression algorithms by replacing traversed pixels with predicting 4 pixels at a time. The high-speed compression scheme in this paper speeds up the reference frame compression module by 62.4%. In addition, this paper proposes a re-compression algorithm to reduce the loss of data reduction rate caused by the high-speed compression algorithm.