The effects of luminance contrast, raster modulation, and ambient illumination on text readability and subjective image quality

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dc.contributor.authorWells, Emily Jeanen
dc.contributor.departmentIndustrial and Systems Engineeringen
dc.date.accessioned2014-03-14T21:39:51Zen
dc.date.adate2009-07-10en
dc.date.available2014-03-14T21:39:51Zen
dc.date.issued1994en
dc.date.rdate2009-07-10en
dc.date.sdate2009-07-10en
dc.description.abstractThis thesis examined the effects of luminance contrast, raster modulation, and ambient illumination on readability and image quality of text presented on a CRT display. Participants read a Tinker Speed of Reading text passage on the monitor and then responded when they found the out-of-context word in the passage. Correct responses and response times were recorded. Participants also rated the image quality of the monitor by selecting a number between one (worst imaginable) and nine (best imaginable). An ANOVA revealed that luminance contrast significantly affected errors. It is suggested that luminance contrasts of 7:1 be used to maintain low error rates. None of the independent variables affected the time required to read the Tinker passages. However, luminance contrast, raster modulation, and illumination significantly affected the subjective quality ratings. Participants rated the 3:1 luminance contrast, the 1.2 RAR, and the 1000 lux ambient illumination conditions as possessing the lowest image quality. From this research, it can be concluded that 7:1 is the preferred contrast ratio. This conclusion is based upon the findings that the 3:1 and 7:1 luminance contrast conditions produced the fewest errors and the 5:1 and 7:1 luminance contrast conditions produced the highest subjective image quality ratings. This recommendation holds over a RAR range of 0.8 to 1.2 and an ambient illumination range of 10 to 100 lux. High illumination levels would require special attention due to the low image quality ratings for the 7:1/1000 lux interaction.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 65 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07102009-040235en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07102009-040235/en
dc.identifier.urihttp://hdl.handle.net/10919/43607en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.W4557.pdfen
dc.relation.isformatofOCLC# 32452030en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.W4557en
dc.subject.lcshHuman engineeringen
dc.subject.lcshVideo display terminalsen
dc.titleThe effects of luminance contrast, raster modulation, and ambient illumination on text readability and subjective image qualityen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineIndustrial and Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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