Screen Content Coding with Primary and Secondary Reference Buffers for String Matching and Copying

摘要

A screen content coding(SCC) algorithm that uses a primary reference buffer(PRB) and a secondary reference buffer(SRB) for string matching and string copying is proposed.PRB is typically the traditional reconstructed picture buffer which provides reference string pixels for the current pixels being coded.SRB stores a few of recently and frequently referenced pixels for repetitive reference by the current pixels being coded.In the encoder,searching of optimal reference string is performed in both PRB and SRB,and either a PRB or SRB string is selected as an optimal reference string on a string-by-string basis.Compared with HM-16.4+SCM-40 reference software,the proposed SCC algorithm can improve coding performance measured by bit- distortion rate reduction of average 4.19%in all-intra configuration for text and graphics with motion category of test sequences defined by JCT- VC common test condition.