基于纹理和亮度感知特性的率失真优化策略

俞力克; 代锋; 张勇东; 林守勋

doi:10.11834/jig.20120108

图像处理和编码 | 浏览量 : 0 下载量: 132 CSCD: 0

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专辑

基于纹理和亮度感知特性的率失真优化策略
Novel rate distortion optimization strategy based on perceptual properties of texture and luminance
2012年17卷第1期页码：54-61
纸质出版：2012
DOI： 10.11834/jig.20120108
稿件说明：

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俞力克, 代锋, 张勇东, 林守勋. 基于纹理和亮度感知特性的率失真优化策略[J]. 中国图象图形学报, 2012,17(1):54-61. DOI： 10.11834/jig.20120108.

Yu Like, Dai Feng, Zhang Yongdong, Lin Shouxun. Novel rate distortion optimization strategy based on perceptual properties of texture and luminance[J]. Journal of Image and Graphics, 2012, 17(1): 54-61. DOI： 10.11834/jig.20120108.

摘要

率失真优化(RDO)策略在视频编码体系中对编码效率有着重要影响。当前主流的率失真优化策略以MSE或类似的方法描述失真

不能很好反映人眼的主观感受。为了提高视频编码的主观感知质量

首先建立一种新的感知失真模型。该模型利用人眼对纹理和亮度的敏感特性

使评价结果能够更好地反映主观质量。在此基础上

提出一种基于纹理和亮度感知特性的率失真优化策略

简称TL-RDO(texture and luminance based RDO)策略。该策略对不同的区域自适应地调整拉格朗日乘子

使得编码结果更好地符合人眼的观察特性。实验结果表明

TL-RDO相比现有最常用的QP-RDO方法

编码效率显著提高;与一些典型的基于感知失真特性的率失真优化策略相比

TL-RDO策略计算复杂度较低

适合于实时编码系统。

Abstract

RDO (rate-distortion optimization) plays an important role in video coding systems and has a great effect on coding efficiency.The most widely used RDO strategy uses MSE or other similar metrics for distortion modeling

which is not a good metric for subjective evaluation.In order to improve the perceptual quality

a novel perceptual distortion model is firstly proposed which takes the perceptual properties of texture and luminance into consideration.Based on the perceptual distortion model

a TL-RDO (texture and luminance based RDO) strategy is proposed which adjusts the Lagrangian multiplier dynamically according to visual perception.The simulation result shows that TL-RDO gets higher coding efficiency than the famous QP-RDO.Moreover

it has low computational consumption compared to other perceptual RDO strategies

which is suitable for real-time systems.