2021 IEEE International Conference on Image Processing

19-22 September 2021 • Anchorage, Alaska, USA

Imaging Without Borders

2021 IEEE International Conference on Image Processing

19-22 September 2021 • Anchorage, Alaska, USA

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Paper Detail

Paper IDCOM-1.11
Paper Title AN ENHANCED REFERENCE STRUCTURE FOR REFERENCE PICTURE RESAMPLING (RPR) IN VVC
Authors Tianliang Fu, Peking University, China; Kai Zhang, Li Zhang, Bytedance Inc., United States; Shanshe Wang, Siwei Ma, Peking University, China
SessionCOM-1: Image and Video Coding
LocationArea H
Session Time:Tuesday, 21 September, 08:00 - 09:30
Presentation Time:Tuesday, 21 September, 08:00 - 09:30
Presentation Poster
Topic Image and Video Communications: Lossy coding of images & video
IEEE Xplore Open Preview  Click here to view in IEEE Xplore
Abstract Reference picture resampling (RPR) is an important feature for real-time communication in Versatile Video Coding, which supports adaptive resolution change without introducing an instantaneous decoder refresh (IDR) or intra random access picture (IRAP). With RPR, considerable coding gain is achieved while bitrate leap still exists. In this paper, an enhanced reference structure for RPR is proposed. First, the high-resolution (HR) references are used to replace the low-resolution (LR) references to provide more accurate prediction. Furthermore, an adaptive decision on the number of HR references kept in RPL is applied to achieve more performance, which utilizes the history information in the current period. Simulation results show about 9% and 5% BD-rate savings on average can be achieved for scaling ratio of 2:1 and 1.5:1 compared to VTM-10.2 under RPR configurations. For sequences with slight motions, the coding gain is up to 20%. Besides, the bitrate explosion in RPR is reduced generally, where over 50% reductions of bitrates at explosion point is observed.