Fast depth map intra-mode selection for 3D-HEVC intra-coding
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ORIGINAL PAPER
Fast depth map intra-mode selection for 3D-HEVC intra-coding Hamza Hamout1
· Abderrahmane Elyousfi2
Received: 15 August 2019 / Revised: 15 January 2020 / Accepted: 6 March 2020 © Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract As the last effort of ISO/IEC MPEG and ITU-T Video Coding Experts Group for 3D video coding, high-efficiency video coding (HEVC)-based 3D video coding (3D-HEVC) is the new international emerging standard to compress multi-view texture videos plus depth maps data. In the test model of 3D-HEVC, the conventional HEVC intra-prediction modes and new additional intra-coding tools called depth modeling modes (DMMs) are exploited for depth map intra-coding. These intramodes provide important coding improvement. However, the improvement of the coding efficiency is obtained at the expense of a computational complexity increase, which obstructs 3D-HEVC from practical real-world applications. Previously, we propose a depth map intra-model decision using tensor features as homogeneity determination. In this paper, we propose an amelioration of the previously proposed depth map intra-model decision using an efficient homogeneity determination. In most cases, the angular intra-coding and DMM could be skipped if some specific conditions are satisfied. The experimental results show that the proposed intra-model decision can reduce the encoding time significantly, with negligible loss of rate distortion performance. Keywords 3D-HEVC · JCT-3V · Fast depth map intra-mode decision · Depth video coding · Intra-coding unit
1 Introduction In the last few years, 3D videos have substantial attention from the academic research and industry after excessive success. As a result, the Joint Collaborative Team on 3D Video Coding (JCT-3V) created by the ISO/IEC MPEG and ITUT Video Coding Experts Group (VCEG) in July 2012 [1] finalizes in February 2016 the standardization of the new generation of an international standard for 3D video coding, namely 3D extension of high-efficiency video coding (3D-HEVC) [2,3]. Influencing by the 3D multimedia technologies, several 3D applications are growing up fastly for the purpose to become more close to real-world reality including free viewpoint video (FVV), 3D gaming play, 3D television (3-DTV), and 3D IMAX technologies [4]. The stereoscopic
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Hamza Hamout [email protected] Abderrahmane Elyousfi [email protected]
1
Computer Systems and Vision Laboratory, The Faculty of Sciences, Ibn-Zohr University, Agadir, Morocco
2
Department of Computer Science, National Engineering School of Applied Sciences (ENSA), Ibn-Zohr University, Agadir, Morocco
was first investigated, which is composed of two captured views at the same time in different positions. To support and display more practically the 3D multimedia video, the autostereoscopic was adopted using a new 3D data format called multi-view video plus depth map (MVD) [5]. The MVD format has been standardized by the Moving Picture Experts Group (MPEG) and being adopted by the 3D-HEVC. This en
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