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Residual coding for transform skip mode in versatile video coding

: Nguyen, T.; Bross, B.; Schwarz, H.; Marpe, D.; Wiegand, T.


Bilgin, A. ; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Signal Processing Society:
Data Compression Conference, DCC 2020. Proceedings : 24-27 March 2020, Snowbird, Utah, USA, Virtual Conference
Los Alamitos, Calif.: IEEE Computer Society Conference Publishing Services (CPS), 2020
ISBN: 978-1-7281-6457-1
ISBN: 978-1-7281-6458-8
Data Compression Conference (DCC) <2020, Online>
Fraunhofer HHI ()

The support for screen content coding has received more attention with the latest development in video compression, the upcoming Versatile Video Coding (VVC) standard. Among the dedicated screen content coding tools, the transform skip mode (TSM) represents a promising approach for improving the coding efficiency at a low impact on implementation complexity. In this work, we present a dedicated residual coding for transform blocks coded in TSM. Due to the lack of the energy compaction of the transform, the quantization indexes for blocks coded in TSM have different statistical properties, which can be exploited in the entropy coding. Our coding experiments with screen content sequences yielded bit-rate savings of 3.9% for intra-only coding and 2.8% for typical random access configurations.