Fast Depth Video Coding with Intra Prediction on VVC

• Published in: KSII transactions on Internet and information systems 2020, 14(7), , pp.3018-3038
• Main Authors: Wei, Hongan, Zhou, Binqian, Fang, Ying, Xu, Yiwen, Zhao, Tiesong
• Format: Article
• Language: English
• Subjects: Algorithms; Image coding; 컴퓨터학
• ISSN: 1976-7277; 1976-7277
• DOI: 10.3837/tiis.2020.07.016

In the stereoscopic or multiview display, the depth video illustrates visual distances between objects and camera. To promote the computational efficiency of depth video encoder, we exploit the intra prediction of depth videos under Versatile Video Coding (VVC) and observe a diverse distribution of intra prediction modes with different coding unit sizes. We propose a hybrid scheme to further boost fast depth video coding. In the first stage, we adaptively predict the HADamard (HAD) costs of intra prediction modes and initialize a candidate list according to the HAD costs. Then, the candidate list is further improved by considering the probability distribution of candidate modes with different CU sizes. Finally, early termination of CU splitting is performed at each CU depth level based on the Bayesian theorem. Our proposed method is incorporated into VVC intra prediction for fast coding of depth videos. Experiments with 7 standard sequences and 4 Quantization parameters (Qps) validate the efficiency of our method. Keywords: Depth video, intra prediction, Versatile Video Coding (VVC), fast coding algorithm, mode decision, early termination