Display spatial luminance nonuniformities: effects on operator performance and perception

This dissertation examined the effects of display spatial luminance nonuniformities on operator performance and perception. The objectives of this research were to develop definitions of nonuniformity, develop accurate measurement techniques, determine acceptable levels of nonuniformities, and to de...

Full description

Bibliographic Details
Main Author: Decker, Jennie Jo
Other Authors: Industrial Engineering and Operations Research
Format: Others
Language:en_US
Published: Virginia Polytechnic Institute and State University 2015
Subjects:
Online Access:http://hdl.handle.net/10919/54510
id ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-54510
record_format oai_dc
spelling ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-545102020-12-23T05:32:33Z Display spatial luminance nonuniformities: effects on operator performance and perception Decker, Jennie Jo Industrial Engineering and Operations Research LD5655.V856 1989.D335 Video display terminals -- Research Computer terminals -- Research Electronic data processing -- Data entry This dissertation examined the effects of display spatial luminance nonuniformities on operator performance and perception. The objectives of this research were to develop definitions of nonuniformity, develop accurate measurement techniques, determine acceptable levels of nonuniformities, and to develop a predictive model based on user performance data. Nonuniformities were described in terms of spatial frequency, amplitude, display luminance, gradient shape, and number of dimensions. Performance measures included a visual random search task and a subjective measure to determine users' perceptions of the nonuniformities. Results showed that users were able to perform the search task in the presence of appreciable nonuniformities. lt was concluded that current published recommendations for acceptable levels of nonuniformities are adequately specified. Results from the subjective task showed that users were sensitive to the presence of nonuniformities in terms of their perceptions of uniformity. Specifically, results showed that as spatial frequency increased, perceived uniformity ratings increased. That is, users rated nonuniformities to be less noticeable. As amplitude and display luminance increased, the users' ratings of perceived uniformity decreased; that is, they rated the display as being farther from a uniform field. There were no differences in impressions between a sine and triangle gradient shape, while a square gradient shape resulted in lower ratings of perceived uniformity. Few differences were attributed to the dimension (1-D versus 2- D) of the nonuniformity and results were inconclusive because dimension was confounded with the display luminance. Nonuniformities were analyzed using Fourier techniques to determine the amplitudes of the coefficients for each nonuniformity pattern. These physical descriptors were used to develop models to predict users' perceptions of the nonuniformities. A few models yielded good fits of the subjective data. lt was concluded that the method for describing and measuring nonuniformities was successful. Also, the results of this research were in strong concurrence with previous research in the area of spatial vision. Ph. D. 2015-07-10T20:00:18Z 2015-07-10T20:00:18Z 1989 Dissertation Text http://hdl.handle.net/10919/54510 en_US OCLC# 20623132 In Copyright http://rightsstatements.org/vocab/InC/1.0/ xi, 247 leaves application/pdf application/pdf Virginia Polytechnic Institute and State University
collection NDLTD
language en_US
format Others
sources NDLTD
topic LD5655.V856 1989.D335
Video display terminals -- Research
Computer terminals -- Research
Electronic data processing -- Data entry
spellingShingle LD5655.V856 1989.D335
Video display terminals -- Research
Computer terminals -- Research
Electronic data processing -- Data entry
Decker, Jennie Jo
Display spatial luminance nonuniformities: effects on operator performance and perception
description This dissertation examined the effects of display spatial luminance nonuniformities on operator performance and perception. The objectives of this research were to develop definitions of nonuniformity, develop accurate measurement techniques, determine acceptable levels of nonuniformities, and to develop a predictive model based on user performance data. Nonuniformities were described in terms of spatial frequency, amplitude, display luminance, gradient shape, and number of dimensions. Performance measures included a visual random search task and a subjective measure to determine users' perceptions of the nonuniformities. Results showed that users were able to perform the search task in the presence of appreciable nonuniformities. lt was concluded that current published recommendations for acceptable levels of nonuniformities are adequately specified. Results from the subjective task showed that users were sensitive to the presence of nonuniformities in terms of their perceptions of uniformity. Specifically, results showed that as spatial frequency increased, perceived uniformity ratings increased. That is, users rated nonuniformities to be less noticeable. As amplitude and display luminance increased, the users' ratings of perceived uniformity decreased; that is, they rated the display as being farther from a uniform field. There were no differences in impressions between a sine and triangle gradient shape, while a square gradient shape resulted in lower ratings of perceived uniformity. Few differences were attributed to the dimension (1-D versus 2- D) of the nonuniformity and results were inconclusive because dimension was confounded with the display luminance. Nonuniformities were analyzed using Fourier techniques to determine the amplitudes of the coefficients for each nonuniformity pattern. These physical descriptors were used to develop models to predict users' perceptions of the nonuniformities. A few models yielded good fits of the subjective data. lt was concluded that the method for describing and measuring nonuniformities was successful. Also, the results of this research were in strong concurrence with previous research in the area of spatial vision. === Ph. D.
author2 Industrial Engineering and Operations Research
author_facet Industrial Engineering and Operations Research
Decker, Jennie Jo
author Decker, Jennie Jo
author_sort Decker, Jennie Jo
title Display spatial luminance nonuniformities: effects on operator performance and perception
title_short Display spatial luminance nonuniformities: effects on operator performance and perception
title_full Display spatial luminance nonuniformities: effects on operator performance and perception
title_fullStr Display spatial luminance nonuniformities: effects on operator performance and perception
title_full_unstemmed Display spatial luminance nonuniformities: effects on operator performance and perception
title_sort display spatial luminance nonuniformities: effects on operator performance and perception
publisher Virginia Polytechnic Institute and State University
publishDate 2015
url http://hdl.handle.net/10919/54510
work_keys_str_mv AT deckerjenniejo displayspatialluminancenonuniformitieseffectsonoperatorperformanceandperception
_version_ 1719371373540802560