基于块方向预测的AV1快速帧内编码算法

doi:10.13229/j.cnki.jdxbgxb.20240173

吉林大学学报(工学版) ›› 2025, Vol. 55 ›› Issue (3): 993-1000.doi: 10.13229/j.cnki.jdxbgxb.20240173

基于块方向预测的AV1快速帧内编码算法

严利民(),金炜烨

上海大学微电子研究与开发中心，上海 200444

收稿日期:2024-02-21 出版日期:2025-03-01 发布日期:2025-05-20
作者简介:严利民（1971-），男，副教授，博士.研究方向：图像处理，计算机视觉，信息安全，集成电路设计与应用.E-mail：yanlm@shu.edu.cn
基金资助:
国家自然科学基金项目(61774101)

Fast algorithm based on block direction prediction for AV1 intra encoding

Li-min YAN(),Wei-ye JIN

Microelectronics Research and Development Center，Shanghai University，Shanghai 200444，China

Received:2024-02-21 Online:2025-03-01 Published:2025-05-20

摘要/Abstract

摘要：

AV1压缩技术增加了编码复杂性，为了满足实时通信（RTC）应用要求，在低端平台上，编码器要以低延迟、低比特率、低编码时间运行，这使得在RTC任务中，使用AV1编码器具有挑战性。对此，本文提出了一种AV1快速帧内编码算法。通过预先计算块的方向特性，在帧内编码方向预测遍历期间，跳过与预先计算的方向显著不同的方向，从而提高libaom-AV1编码器的编码速度，节省帧内编码时间，并加速AV1在低延迟视频编码应用中的进展。实验结果表明：该算法可节省25.89%的运行时间，且编码时间节省后，编码性能损失较小。

关键词: AV1, libaom, 实时编码, 帧内编码速度优化

Abstract:

AV1 compression technology increases encoding complexity. In order to meet the requirements of real-time communication （RTC） applications， encoders need to run at low latency， low bit rate， and low encoding time on low-end platforms， which makes using AV1 encoders challenging in RTC tasks. In this regard， this article proposes an AV1 fast intra frame encoding algorithm. By pre calculating the directional characteristics of blocks， during the intra frame encoding direction prediction traversal， significantly different directions from the pre calculated direction are skipped， thereby improving the encoding speed of the libaom-AV1 encoder， saving intra frame encoding time， and accelerating the progress of AV1 in low latency video encoding applications. The experimental results show that the algorithm can save 25.89% of running time， and after saving encoding time， the loss of encoding performance is relatively small.

Key words: AV1, libaom, real-time encoding, intra encoding speed optimization

中图分类号:

TP312

严利民,金炜烨. 基于块方向预测的AV1快速帧内编码算法[J]. 吉林大学学报(工学版), 2025, 55(3): 993-1000.

Li-min YAN,Wei-ye JIN. Fast algorithm based on block direction prediction for AV1 intra encoding[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(3): 993-1000.

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分辨率	序列名称	原编码时间/s	优化后编码耗时/s	TS/%	BD-rate损失/%
416×240	BasketballPass	22.49	15.15	32.64	0.47
	BlowingBubbles	29.74	20.34	31.61	0.33
	BQSquare	23.24	17.28	25.65	0.37
	RaceHorses1	23.48	16.68	28.96	0.40
832×480	BasketballDrillText	87.73	67.28	23.31	0.18
	BasketballDrill	79.89	61.33	23.23	0.61
	BQMall	90.61	63.15	30.31	0.40
	PartyScene	96.33	77.24	19.82	0.36
	RaceHorses2	83.40	62.69	24.83	0.34
1 024×768	ChinaSpeed	86.96	70.17	19.31	0.17
1 280×720	SlideEditing	105.87	87.84	17.03	0.06
1 280×720	SlideShow	50.89	40.38	20.65	0.32
1 920×1 080	BasketballDrive	350.95	268.02	23.63	0.24
	BQTerrace	368.42	303.56	17.60	0.31
	Cactus	524.32	370.92	29.26	0.25
	Kimono1	383.74	257.10	33.00	0.11
	ParkScene	508.43	354.90	30.20	0.14
	vidyo4	120.18	87.70	27.03	0.38
2 560×1 600	PeopleOnStreet	723.64	509.90	29.54	0.30
2 560×1 600	Traffic	805.04	560.62	30.36	0.25

算法	TS/%	BD-rate损失/%
文献［4］	15.86	0.44
文献［5］	8.67	0.04
本文	25.89	0.29

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基于块方向预测的AV1快速帧内编码算法

Fast algorithm based on block direction prediction for AV1 intra encoding

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