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Proceedings Paper

Subjective responses to constant and variable quality video
Author(s): David S. Hands; Kennedy Cheng
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Paper Abstract

This paper describes an experiment examining subjective ratings in response to variations in the reproduction quality of a video signal. Additionally, the test was designed to examine if pricing affected subjective judgements. Test materials were created with either constant quality or variable quality where quality was manipulated by reference to the video frame rate. Subjects were required to provide both quality and acceptability ratings for each test sequence. Two levels of variable quality were created: one in which the quality varied between medium and high quality (low variability), the other being variability between low and high quality (high variability). Subjects were assigned to one of three price bands prior to beginning the test. The test found that, for equivalent average quality sequences, subjects preferred constant quality to high variability. There was no difference in ratings for constant quality and low variability sequences. The results indicate that video encoding methods may take advantage of some variation in video quality provided the perceptual impact of changes in quality are not marked.

Paper Details

Date Published: 4 March 2008
PDF: 7 pages
Proc. SPIE 6806, Human Vision and Electronic Imaging XIII, 680618 (4 March 2008); doi: 10.1117/12.765870
Show Author Affiliations
David S. Hands, BT Research and Venturing (United Kingdom)
Kennedy Cheng, BT Research and Venturing (United Kingdom)

Published in SPIE Proceedings Vol. 6806:
Human Vision and Electronic Imaging XIII
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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