Current Picture Referencing in Versatile Video Coding

Screen content coding (SCC) is a recognized feature in versatile video coding (VVC), the most recent international video coding standard development. Among all the coding tools that have been evaluated for SCC in the past, current picture referencing (CPR), or by another name intra block copy (IBC), has shown its effectiveness in coding of computer-generated contents such as texts and graphics. Therefore, it has been adopted into the HEVC standard version 4, extensions for SCC. In this paper, several variations of CPR implementations are proposed and discussed. Among those methods, the one with the best trade-off between coding efficiency and implementation cost has been adopted into the new VVC standard working draft and the reference software VTM.