基于快速编码单元划分和自适应模式决策的HEVC效率改进算法

doi:10.16180/j.cnki.issn1007-7820.2020.10.004

Abstract

Abstract:

In order to improve the coding efficiency of HEVC in real-time video, this study proposes an improved HEVC efficiency algorithm based on fast coding unit partition and adaptive mode decision. By using the separation depth information of the adjacent coding units on the top and left, it is determined whether the can coding unit could be separated or terminated early. When the condition is not satisfied, the coding unit can end its quad-tree separation by using the Rate-distortion cost threshold determined by training frame online learning. At the same time, the minimum Rate-distortion cost model and the second smallest Rate-distortion cost model were adopted to reduce the number of candidate sets and determine candidate set CS₅. Then, CS₅ is optimized to reduce the number of candidate Rate-distortion optimization. Finally, the Rate-Distortion optimization calculation was carried out to select the optimal mode to reduce the number of prediction modes. Experimental results show that compared with HM standard test results, the proposed algorithm can effectively reduce the video coding time of 45.93% under the premise of ensuring the coding quality, with only 0.597 8% of BDBR rising.

Key words: HEVC, fast coding unit prediction, intra pretition, rate-distortion cost, adaptive mode decision, video coding

CLC Number:

TN919.81

LUO Xiaolong,LIU Zilong. HEVC Efficiency Improvement Algorithm Based on Fast Coding Unit Partition and Adaptive Mode Decision[J].Electronic Science and Technology, 2020, 33(10): 21-25.

Figures/Tables 6

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Table 2

References 16

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PU值	α₂	α₃	α₄	α₅	α₆
4	0.71	0.72	0.76	0.78	0.82
8	0.80	0.82	0.86	0.87	0.88
16	0.85	0.87	0.90	0.92	0.93
32	0.87	0.89	0.92	0.93	0.93
64	0.88	0.91	0.93	0.94	0.94

视频序列	快速编码单元划分算法		自适应模式决策算法		本文综合算法
视频序列	BDBR/%	TS/%	BDBR/%	TS/%	BDBR/%	TS/%
PeopleOnstreet	0.570 6	50.30	0.77	40.10	0.550 7	49.30
Traffic	0.454 1	39.55	0.99	38.89	0.435 9	43.19
Kimono	0.803 2	67.41	1.40	41.69	0.786 9	58.54
ParkScene	0.117 7	38.37	0.75	41.69	0.109 8	44.37
BasketballDrive	1.132 0	47.92	0.95	41.94	1.109 5	48.58
BQTerrace	0.397 0	45.46	0.51	40.42	0.378 5	46.77
BQMall	0.582 9	35.30	0.83	40.86	0.564 0	42.23
BasketballDrill	0.347 9	40.94	1.09	39.48	0.328 7	44.09
PartyScene	0.268 0	30.59	0.79	39.48	0.249 1	39.15
RaceHorses	0.465 0	35.35	0.84	39.75	0.446 2	41.25
BQSquare	0.245 5	30.13	1.29	42.28	0.227 9	40.55
BasketballPass	0.443 6	40.89	0.93	39.16	0.425 8	44.52
BlowingBubbles	0.125 1	30.56	0.78	40.00	0.108 7	39.86
FourPeople	0.738 5	48.02	1.00	40.40	0.719 7	48.37
Johnny	1.907 7	56.44	1.11	40.50	1.884 0	52.03
KristenAndSara	1.259 0	56.62	1.19	40.00	1.240 0	52.02
均值	0.616 1	43.37	0.93	40.58	0.597 8	45.93

HEVC Efficiency Improvement Algorithm Based on Fast Coding Unit Partition and Adaptive Mode Decision

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