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Title: Fast depth intra coding based on decision tree in 33D-HEVC
Authors: Fu, CH
Chen, H
Chan, YL 
Tsang, SH 
Hong, H
Zhu, XH
Issue Date: 2019
Source: IEEE access, 2 Dec. 2019, v. 7, p. 173138-173147
Abstract: The coding units (CU) partitioning in the 3D extension of the high efficiency video coding standard (3D-HEVC) is recursively conducted on different block sizes from 64 x 64 to 8 x 8. Besides, the depth coding in 3D-HEVC introduces several new coding tools for each CU to improve the coding efficiency, however, with great computational complexity. It is noted that only a small number of the CUs in recursive partitioning are encoded into the final bitstream. Among these CUs, the CUs with Intra 2N x 2N or Intra N x N as optimal modes have a very small proportion. In this paper, we thus propose an early determination of depth intra coding, where the coding stage of Intra 2N x 2N, Intra N x N or CU Splitting for the CUs could be early skipped based on several Decision Trees. Simulation results show that, with restrict the results from the tree leaves by different Gini thresholds, the proposed algorithm could save 41.14%-71.63% of the depth coding time with only a slight increase in BDBR.
Keywords: 3D-HEVC
CU size decision
Decision tree
Gini thresholds
Depth intra coding
Fast mode decision
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE access 
EISSN: 2169-3536
DOI: 10.1109/ACCESS.2019.2956994
Rights: This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see
The following publication C. Fu, H. Chen, Y. Chan, S. Tsang, H. Hong and X. Zhu, "Fast Depth Intra Coding Based on Decision Tree in 3D-HEVC," in IEEE Access, vol. 7, pp. 173138-173147, 2019 is available at
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