基于人眼感知特性的亮度系数压缩方法

喻  莉; 郭  姗; 徐士麟; 周  刚; 李  荣

doi:10.11834/jig.20090312

图像处理和编码 | 浏览量 : 0 下载量: 283 CSCD: 0

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专辑

基于人眼感知特性的亮度系数压缩方法
A Perceptual Coding Method Based on the Compression of Luma Coefficients
2009年14卷第3期页码：452
纸质出版：2009
DOI： 10.11834/jig.20090312
稿件说明：

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喻莉, 郭姗, 徐士麟, 周刚, 李荣. 基于人眼感知特性的亮度系数压缩方法[J]. 中国图象图形学报, 2009,14(3):452. DOI： 10.11834/jig.20090312.

YU Li, GUO Shan, XU Shilin, ZHOU Gang, LI Rong. A Perceptual Coding Method Based on the Compression of Luma Coefficients[J]. Journal of Image and Graphics, 2009, 14(3): 452. DOI： 10.11834/jig.20090312.

摘要

在传统视频编码系统中，尽管失真大多由均方误差(MSE)度量，但是基于MSE的失真往往难以衡量不同视频流的主观差异，因此，人眼视觉系统对视频流的感知特性有必要被编码器利用。为了进一步提高编码效率，针对人眼对不同亮度的信号敏感程度不同的特性，提出了一种基于人眼感知特性的亮度系数压缩算法，该算法通过前向量化将人眼不能察觉的冗余信息丢掉来提高编码器压缩效率，并保证了人眼对损失的信息不可见。实验结果表明，采用该算法的AVS参考编码器，其输出码率的下降幅度达到8%～40%，而解码图像的主观观测质量却同未采用该算法的编码器相当。

Abstract

In the conventional video coding system

the distortion is always measured by Mean-square-error (MSE). However

the MSE-based distortion fails to measure the subjective difference of videos. As a result

the property and interest of human visual system (HVS) should be considered by video coder. This paper proposes a new perceptual coding method aiming at compressing the luma coefficients in terms of the eyes sensitivity. By using the pre-quantization strategy

it discards the imperceptible information and improves the compression performance of video codec without contaminating the video subjective quality. The experiment result proves that this perceptual coding method can efficiently reduce the output bit rate of AVS reference software by 8%~40% while guaranteeing the quality of decoded video.