Study of sub-pel block vector for intra block copy

Yujin Lee; Bumyoon Kim; Byeungwoo Jeon

doi:10.1117/12.2631960

30 April 2022 Study of sub-pel block vector for intra block copy

Yujin Lee, Bumyoon Kim, Byeungwoo Jeon

Proceedings Volume 12177, International Workshop on Advanced Imaging Technology (IWAIT) 2022; 121771B (2022) https://doi.org/10.1117/12.2631960
Event: International Workshop on Advanced Imaging Technology 2022 (IWAIT 2022), 2022, Hong Kong, China

Abstract

Versatile video coding (VVC) has the intra block copy (IBC) coding tool for intra prediction. It uses block vector (BV) of resolution in either 1-pel or 4-pel accuracy to indicate a reference block in the current picture. However, a block vector not expressed in sub-pel accuracy might have limitation in accurately locating a reference block. In this context, we investigate representing BV in sub-pel resolution of half-pel and quarter-pel accuracy. According to our study, in case of camera-captured video contents, 18.96% and 28.63% of BVs prefer to be estimated in half-pel and quarter-pel resolutions respectively if sub-pel accuracy is allowed for the IBC block vector. Regarding the block vector difference (BVD), 8.72% and 9.98% of BVs choose to be signaled using nonzero BVD in half-pel and quarter-pel, respectively. This is comparable to the usage ratio of existing 4-pel resolution of IBC. Also, allowing the half-pel and quarter-pel resolutions of BV brings coding gain in some natural content sequences. Therefore, to further improve coding efficiency of IBC especially in natural video content, sub-pel resolution of BVs can be effective.

Citation Download Citation

Yujin Lee, Bumyoon Kim, and Byeungwoo Jeon "Study of sub-pel block vector for intra block copy", Proc. SPIE 12177, International Workshop on Advanced Imaging Technology (IWAIT) 2022, 121771B (30 April 2022); https://doi.org/10.1117/12.2631960

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KEYWORDS

Video

Video coding

Computer programming

Cameras

Copper

Chromium

Scientific research

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