一种多色度格式级联编码的AVS2全色度图像编码算法

doi:10.11959/j.issn.1000-0801.2018122

电信科学 ›› 2018, Vol. 34 ›› Issue (4): 57-67.doi: 10.11959/j.issn.1000-0801.2018122

一种多色度格式级联编码的AVS2全色度图像编码算法

赵利平¹,林涛²,周开伦²,胡珂立¹,林春梅¹

¹ 绍兴文理学院计算机科学与工程系，浙江绍兴 312000
² 同济大学超大规模集成电路研究所，上海 200092

修回日期:2018-03-02 出版日期:2018-04-01 发布日期:2018-05-02
作者简介:赵利平（1984-），女，博士，绍兴文理学院计算机科学与工程系讲师，主要研究方向为高效视频编码、屏幕图像编码。|林涛（1958-），男，博士，同济大学超大规模集成电路研究所长江学者特聘教授，主要研究方向为高效视频编码、屏幕图像编码、多媒体芯片设计等。|周开伦（1977-），男，博士，同济大学超大规模集成电路研究所讲师，主要研究方向为视频编码、超大规模集成电路架构、设计与验证。|胡珂立（1989-），男，博士，绍兴文理学院计算机科学与工程系讲师，主要研究方向为图像处理、目标跟踪。|林春梅（1961-），女，博士，绍兴文理学院计算机科学与工程系副教授，主要研究方向为机器学习。
基金资助:
国家自然科学基金资助项目(61601200);国家自然科学基金资助项目(61603258)

A multi-chroma format cascaded coding method for full-chroma image in AVS2

Liping ZHAO¹,Tao LIN²,Kailun ZHOU²,Keli HU¹,Chunmei LIN¹

¹ Department of Computer Science and Engineering,Shaoxing University,Shaoxing 312000,China
² Institute of VLSI,Tongji University,Shanghai 200092,China

Revised:2018-03-02 Online:2018-04-01 Published:2018-05-02
Supported by:
The National Natural Science Foundation of China(61601200);The National Natural Science Foundation of China(61603258)

摘要/Abstract

摘要：

在我国最新的第二代数字音视频编解码算法标准（AVS2）的基础上，提出了一种多色度格式级联编码（MCFCC）的全色度（4:4:4采样格式）图像编码算法。MCFCC算法首先对4:4:4采样格式的图像进行色度下采样转换成4:2:0采样格式的图像，然后进行4:2:0采样格式的帧内预测、变换、量化、反量化、反变换、熵编码和在率—失真最优化过程中使用带权重的4:4:4采样格式的失真计算方案，最后将其上采样为4:4:4采样格式的预测补偿图像并采用4:4:4采样格式的环内滤波补偿算法。实验结果表明：对于全色度自然图像，MCFCC算法在低编码复杂度和低实现成本（完全复用4:2:0编解码模块）的前提下，综合编码效率进一步提高。

关键词: 图像编码, AVS2, 全色度, 色度重采样, 环内滤波

Abstract:

In the second generation of audio video coding standard (AVS2),a multi-chroma format cascaded coding method (MCFCC) for full-chroma (4:4:4 sampling format) images coding was proposed.The MCFCC algorithm firstly converts the 4:4:4 sampling format image into 4:2:0 sampling format image,then the 4:2:0 sampling format image was processed by 4:2:0 sampling format intra prediction,transform,quantization,inverse quantization,inverse transform,entropy coding and a weighted 4:4:4 sampling format distortion calculation method in the rate-distortion optimization process,finally 4:4:4 sampling format in-loop filtering and offset algorithms were applied to the 4:4:4 sampling format image after up sampling.The experimental results show that,for full-chroma natural images,the MCFCC algorithm achieves higher coding efficiency at very low additional encoding complexity and very low additional design and implementation cost.

Key words: image coding, AVS2, full-chroma, chroma subsampling, in-loop filtering

中图分类号:

TP919.81

赵利平,林涛,周开伦,胡珂立,林春梅. 一种多色度格式级联编码的AVS2全色度图像编码算法[J]. 电信科学, 2018, 34(4): 57-67.

Liping ZHAO,Tao LIN,Kailun ZHOU,Keli HU,Chunmei LIN. A multi-chroma format cascaded coding method for full-chroma image in AVS2[J]. Telecommunications Science, 2018, 34(4): 57-67.

图/表 12

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参考文献 24

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	算法	参数	4:2:0采样格式	4:4:4采样格式
环内滤波补偿	DF	色度DF块数目（以8×8为单位）	（图像高度/8）×（图像宽度/8）/4	（图像高度/8）×（图像宽度/8）
	SAO	色度SAO	32×32	64×64
		单元大小
	ALF	色度ALF单元大小	32×32	64×64

算法类别	参数名称值
全4:4:4、伪4:4:4、伪LI4:4:4、MCFCC算法、AVS2SM算法	编码配置全帧内（all intra,AI）编码
	编码类型有损编码
全4:4:4算法	超高质量QP组2，7，12，17
	传统QP组22，27，32，37
	其余编码参数配置同HEVC-RExt通用测试条件的标准配置^[21]
伪4:4:4、伪LI4:4:4、	超高质量QP组0，5，12，18
MCFCC算法、AVS2SM算法	传统QP组25，32，38，45
	其余编码参数配置同AVS2通用测试条件的标准配置^[22]

数据名称	MCFCC相对全4:4:4				MCFCC相对伪4:4:4				MCFCC相对伪LI4:4:4
	BD-rate				BD-rate				BD-rate
	Y	U	V	YUV	Y	U	V	YUV	Y	U	V	YUV
RGB_OR_003	-4.4%	64.4%	82.5%	-0.9%	1.0%	-12.6%	-13.8%	0.1%	1.0%	-11.4%	-13.0%	0.2%
RGB_OR_004	-8.8%	116.4%	86.8%	-0.4%	3.0%	-17.6%	-17.6%	0.1%	3.0%	-13.4%	-13.3%	0.8%
RGB_OR_014	-11.0%	76.8%	83.8%	-1.0%	2.9%	-28.8%	-25.8%	-4.2%	2.9%	-15.5%	-13.8%	-0.8%
RGB_OR_016	-6.4%	75.7%	65.5%	-3.6%	0.9%	-15.7%	-14.0%	0.0%	0.9%	-11.9%	-11.7%	0.2%
RGB_OR_018	-6.8%	82.1%	79.8%	-2.1%	1.0%	-18.7%	-30.9%	-1.5%	1.0%	-12.4%	-17.1%	-0.4%
RGB_OR_027	-5.1%	73.6%	70.2%	-1.6%	1.2%	-14.4%	-14.6%	0.1%	1.2%	-12.0%	-12.9%	0.2%
RGB_OR_029	-8.6%	79.8%	75.8%	-0.6%	2.4%	-20.5%	-33.8%	-3.8%	2.4%	-12.6%	-17.4%	-0.8%
RGB_OR_030	-13.7%	76.7%	82.5%	-3.3%	2.7%	-26.6%	-24.5%	-4.1%	2.7%	-13.8%	-13.0%	-0.8%
RGB_OR_032	-14.7%	93.2%	102.4%	-5.4%	2.4%	-23.9%	-23.8%	-2.3%	2.4%	-13.6%	-13.4%	-0.2%
RGB_OR_038	-12.9%	67.1%	79.1%	-3.0%	3.8%	-19.0%	-31.0%	-3.6%	3.8%	-11.4%	-14.2%	0.1%
RGB_OR_042	-10.3%	78.1%	71.6%	-2.7%	2.9%	-27.9%	-23.8%	-2.4%	2.9%	-14.7%	-14.7%	0.0%
RGB_OR_062	-14.3%	108.7%	83.3%	-4.7%	1.3%	-18.0%	-11.9%	-1.4%	1.3%	-11.5%	-8.3%	-0.5%
平均编码效率	-9.8%	82.7%	80.3%	-2.4%	2.1%	-20.3%	-22.1%	-1.9%	2.1%	-12.9%	-13.6%	-0.2%

数据名称	MCFCC与伪4:4:4				MCFCC与伪LI4:4:4
	BD-rate				BD-rate
	Y	U	V	YUV	Y	U	V	YUV
RGB_OR_003	1.1%	-31.8%	-36.8%	-7.0%	1.1%	-19.5%	-27.5%	-4.5%
RGB_OR_004	1.2%	-62.4%	-48.4%	-8.5%	1.2%	-47.6%	-32.3%	-5.1%
RGB_OR_014	1.3%	-100%	-100%	-50.3%	1.3%	-100%	-100%	-25.9%
RGB_OR_016	0.8%	-39.7%	-27.5%	-10.0%	0.8%	-19.3%	-16.5%	-5.1%
RGB_OR_018	0.8%	-100%	-100%	-26.7%	0.8%	-42.5%	-100%	-15.1%
RGB_OR_027	0.8%	-41.4%	-41.0%	-8.8%	0.8%	-24.1%	-27.4%	-5.0%
RGB_OR_029	1.2%	-100%	-100%	-37.6%	1.2%	-51.5%	-100%	-16.4%
RGB_OR_030	1.1%	-100%	-100%	-39.4%	1.1%	-100%	-52.1%	-17.9%
RGB_OR_032	1.1%	-100%	-100%	-29.6%	1.1%	-50.7%	-43.6%	-14.7%
RGB_OR_038	1.3%	-100%	-100%	-32.4%	1.3%	-51.0%	-77.3%	-12.8%
RGB_OR_042	1.4%	-100%	-63.5%	-30.0%	1.4%	-50.8%	-29.6%	-11.8%
RGB_OR_062	0.8%	-100%	-45.4%	-25.2%	0.8%	-100%	-25.5%	-17.0%
平均编码效率	1.1%	-81.3%	-71.9%	-25.5%	1.1%	-54.8%	-52.7%	-12.6%

	QP组2					QP组1
		BD-rate		EncTime		BD-rate		EncTime
	Y	U	V	YUV		Y	U	V	YUV
伪LI4:4:4相对伪4:4:4	0.0%	-48.3%	-49.0%	-16.6%	99.8%	0.0%	-8.7%	-10.1%	-1.8%	99.9%
MCFCC相对伪4:4:4	1.1%	-74.0%	-65.6%	-25.5%	103.2%	2.1%	-20.4%	-22.2%	-1.9%	102.2%
AVS2SM相对伪4:4:4	16.3%	-89.2%	-96.1%	-35.0%	131.4%	-0.2%	-32.4%	-34.5%	-6.2%	117.2%

一种多色度格式级联编码的AVS2全色度图像编码算法

A multi-chroma format cascaded coding method for full-chroma image in AVS2

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