The Effect of Spatial Distortion Distributions on Human Viewing Behaviour when Judging Image Quality

Document type: Conference Presentations
Peer reviewed: Yes
Author(s): Ulrich Engelke, Anthony Maeder, Hans-Jürgen Zepernick
Title: The Effect of Spatial Distortion Distributions on Human Viewing Behaviour when Judging Image Quality
Conference name: European Conference on Visual Perception
Year: 2009
Pagination: 22
Publisher: Pion Ltd
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Authors e-mail: uen@bth.se
Language: English
Abstract: In wireless communication, distortions are induced into an image through both lossy source coding and an error prone channel. The combination thereof causes complex distortion patterns in the visual content which vary strongly in their spatial distribution, some being uniformly spread and others being locally clustered. In the context of image quality, it is of interest to identify as to how the distribution of the distortions impact on the visual attention of human observers and thus on the perceived quality. For this reason, we conducted an experiment in which fifteen participants were asked to rate the quality of eighty distorted images and their corresponding reference images, while we recorded their gaze patterns using an eye tracker. The test images contained a wide range of artifact magnitudes, both locally and globally distributed, and were created using a wireless channel simulation model. We then correlate the visual gaze patterns of the human observers with local energy measures of the distortions in order to identify the effect of distortion distributions on the viewing behaviour of human observers when judging image quality. The outcomes serve to improve the prediction performance of objective image quality metrics that we previously proposed.
Subject: Telecommunications\General
Human Work Science\Human Computer Interaction
Psychology\General
Keywords: Human visual system, eye tracking, wireless image communication
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