Hybrid stopping model-based fast PU and CU decision for 3D-HEVC texture coding
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ORIGINAL RESEARCH PAPER
Hybrid stopping model‑based fast PU and CU decision for 3D‑HEVC texture coding Yue Li1 · Gaobo Yang1 · Yapei Zhu2 · Xiangling Ding1 · Yun Song3 · Dengyong Zhang3 Received: 12 July 2018 / Accepted: 23 April 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract As an extension of High-Efficiency Video Coding (HEVC) standard, 3D-HEVC needs to encode multiple texture views and depth maps, which further increases the computational complexity. To reduce the complexity of dependent texture view coding, a fast prediction unit (PU) and coding unit (CU) decision method is proposed for 3D-HEVC based on hybrid stopping model. The inter-view correlation is used as a priori information to roughly predict the possible optimal PU and CU sizes. Then, by exploiting the encoded posterior information, the rate distortion cost correlation and the code block flag, the optimal PU and CU are further examined as being optimal or not. Experimental results show that the proposed fast PU and CU decision method achieves 52.7% encoding time saving on average with negligible loss of coding efficiency for 3D-HEVC-dependent texture view coding. Keywords 3D High-Efficiency Video Coding · Prediction unit · Coding unit · Rate distortion cost · Hybrid stopping model
1 Introduction In recent years, three-dimension video (3DV), which is obtained by capturing the same scene from different viewing angles, has become prevalent in many broadcasting services such as video conference system, 3D television (3DTV) and free viewpoint television (FVT) [1]. Viewers involved in 3DV applications are provided with immersive perceptions of real-world scenes. 3D video is made up of multiple texture views and associated depth maps. Meanwhile, it can synthesize more virtual views by depth-image-based rendering [2]. Due to the increasing number of views to capture a scene, a great amount of data in 3D video content limits its efficient transmission and storage. To address this issue, a 3D video coding standard, which is referred to as the 3D video extension of High-Efficiency Video Coding * Gaobo Yang [email protected] 1
School of Information Science and Engineering, Hunan University, Changsha 410082, China
2
Faculty of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421002, China
3
School of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha 410114, China
(3D-HEVC), has been developed by the Joint Collaborative Team on 3D Video (JCT-3V) [3, 4]. In 3D-HEVC, texture views are classified as independent views and dependent views. Figure 1 shows the prediction structure of 3D-HEVC. Independent views are encoded with a non-modified HEVC codec [5, 6]. Dependent views are encoded with a modified HEVC codec, which supports extra coding tools and inter-component prediction techniques, to further reduce inter-view redundancy. For the mode decision of 3D-HEVC, each coding tree unit (CTU) may contain one coding unit (CU) or recursively split
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