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8. Study On Coding Tools Beyond AV1

Author

Zhao, Xin, primary, Zhao, Liang, additional, Krishnan, Madhu, additional, Du, Yixin, additional, Liu, Shan, additional, Mukherjee, Debargha, additional, Xu, Yaowu, additional, and Grange, Adrian, additional

Published
2021
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15. A Technical Overview of AV1.

Author

Han, Jingning, Li, Bohan, Mukherjee, Debargha, Chiang, Ching-Han, Grange, Adrian, Chen, Cheng, Su, Hui, Parker, Sarah, Deng, Sai, Joshi, Urvang, Chen, Yue, Wang, Yunqing, Wilkins, Paul, Xu, Yaowu, and Bankoski, James

Subjects
VIDEO compression, BIT rate, VIDEO codecs, STREAMING media
Abstract

The AV1 video compression format is developed by the Alliance for Open Media consortium. It achieves more than a 30% reduction in bit rate compared to its predecessor VP9 for the same decoded video quality. This article provides a technical overview of the AV1 codec design that enables the compression performance gains with considerations for hardware feasibility. [ABSTRACT FROM AUTHOR]

Published
2021
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20. Optical Flow Based Co-Located Reference Frame for Video Compression.

Author

Li, Bohan, Han, Jingning, Xu, Yaowu, and Rose, Kenneth

Subjects
OPTICAL flow, VIDEO compression, MOTION capture (Human mechanics), OPTICAL distortion, VIDEO coding
Abstract

This paper proposes a novel bi-directional motion compensation framework that extracts existing motion information associated with the reference frames and interpolates an additional reference frame candidate that is co-located with the current frame. The approach generates a dense motion field by performing optical flow estimation, so as to capture complex motion between the reference frames without recourse to additional side information. The estimated optical flow is then complemented by transmission of offset motion vectors to correct for possible deviation from the linearity assumption in the interpolation. Various optimization schemes specifically tailored to the video coding framework are presented to further improve the performance. To accommodate applications where decoder complexity is a cardinal concern, a block-constrained speed-up algorithm is also proposed. Experimental results show that the main approach and optimization methods yield significant coding gains across a diverse set of video sequences. Further experiments focus on the trade-off between performance and complexity, and demonstrate that the proposed speed-up algorithm offers complexity reduction by a large factor while maintaining most of the performance gains. [ABSTRACT FROM AUTHOR]

Published
2020
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23. An Overview of Core Coding Tools in the AV1 Video Codec

Author

Chen, Yue, primary, Murherjee, Debargha, additional, Han, Jingning, additional, Grange, Adrian, additional, Xu, Yaowu, additional, Liu, Zoe, additional, Parker, Sarah, additional, Chen, Cheng, additional, Su, Hui, additional, Joshi, Urvang, additional, Chiang, Ching-Han, additional, Wang, Yunqing, additional, Wilkins, Paul, additional, Bankoski, Jim, additional, Trudeau, Luc, additional, Egge, Nathan, additional, Valin, Jean-Marc, additional, Davies, Thomas, additional, Midtskogen, Steinar, additional, Norkin, Andrey, additional, and de Rivaz, Peter, additional

Published
2018
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