MEASUREMENT OF SCENE-DEPENDENT QUALITY VARIATIONS IN DIGITALLY CODED TELEVISION PICTURES

被引：26

作者：

ALDRIDGE, R ^{[1
]}

DAVIDOFF, J ^{[1
]}

GHANBARI, M ^{[1
]}

HANDS, D ^{[1
]}

PEARSON, D ^{[1
]}

机构：

[1] UNIV ESSEX,DEPT PSYCHOL,COLCHESTER CO4 3SQ,ESSEX,ENGLAND

来源：

IEE PROCEEDINGS-VISION IMAGE AND SIGNAL PROCESSING | 1995年 / 142卷 / 03期

关键词：

BIT RATE; CODING DISTORTION; RECENCY EFFECT; TELEVISION PICTURES; TESTING METHODOLOGY; TEST SEQUENCES;

D O I：

10.1049/ip-vis:19951937

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Experiments are reported in which the ITU-R Double Stimulus Continuous Quality Scale (DSCQS) method was used to assess scene-dependent, time-varying television picture coding distortions introduced by MPEG-2 coding, at bit rates ranging from 1 Mbit/s to 7.5 Mbit/s. Test sequence lengths of both 10 s and 30 s were employed, the latter in an attempt to present to subjects a more representative range of quality variations, which were found to be large. In forming quality judgements of 30 s sequences, subjects gave significantly more weight to impairments occurring towards the end of the sequence; for identical impairments in the first and in the last 10 s of such a sequence, the difference in rating was typically about half a scale point on a 5-point scale. This recency effect is probably linked to the short-term nature of human working memory.

引用

页码：149 / 154

页数：6