文献类型：期刊文献

英文题名：Enhanced Intra String Copy for Screen Content Coding in AVS3

作者：Zhao, Liping[1,2];Wang, Huihui[3];Zhou, Qingyang[3];Zhang, Wenjuan[3];Zhou, Kailun[3];Hu, Keli[1,2];Lin, Tao[3]

机构：[1]Shaoxing Univ, Dept Comp Sci & Engn, Shaoxing 312000, Peoples R China;[2]Peking Univ, Informat Technol Res & Dev Innovat Ctr, Shaoxing 312000, Peoples R China;[3]Tongji Univ, Coll Elect & Informat Engn, VLSI Lab, Shanghai 200092, Peoples R China

年份：2022

卷号：10

起止页码：80403

外文期刊名：IEEE ACCESS

收录：SCI-EXPANDED(收录号：WOS:000838618700001)、、EI(收录号：20223312566644)、Scopus(收录号：2-s2.0-85135745482)、WOS

基金：This work was supported in part by the Natural Science Foundation of Zhejiang Province under Grant LTY22F020003, Grant LY20F020011, and Grant TY22F025548; in part by the National Science Foundation of China under Grant 61871289; in part by the Natural Science Foundation of Shanghai under Grant 19ZR1461100; and in part by the Social Sciences and Humanities Youth Foundation of Ministry of Education of China under Grant 21YJCZH039.

语种：英文

外文关键词：Encoding; Complexity theory; Copper; Standards; Frequency modulation; Hardware; Transforms; Video coding standard; screen content coding; intra string copy; string split; point vector

外文摘要：Driven by growing applications that use computer screens as interfaces for daily remote interactions, almost all current video coding standards have included screen content coding (SCC) tools. Recently, an efficient SCC tool called intra string copy (ISC) has been adopted in the third-generation of audio video coding standard in China (AVS3). ISC has two coding unit (CU) level sub-modes: fully-matching-string and partially-matching-string based string prediction (FPSP) sub-mode and equal-value-string, unit-basis-vector-string, and unmatched-pixel-string based string prediction (EUSP) sub-mode. To further improve the coding efficiency of SCC, this paper proposes four enhancement techniques of ISC (EISC), including CU partition improvements, point vector (PV) relocation and reactivation, line-based overlapping string prediction, and an optimized coding method for string length in the EUSP sub-mode. Compared with the latest AVS3 reference software HPM with EISC disabled, using AVS3 SCC common test condition and YUV test sequences in text and graphics with motion and mixed content categories, the proposed technique achieves an average Y BD-rate reduction of 2.39% and 1.49% for all intra (AI) and low-delay B (LDB) configurations, respectively, with low additional encoding complexity and almost no additional decoding complexity. All proposed ISC enhancement techniques have been adopted in AVS3.