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Experimental Study Of The Effects Of Surround Brightness And Size On Visual Performance
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Book Synopsis Experimental Study of the Effects of Surround Brightness and Size on Visual Performance by : Fred H. Ireland
Download or read book Experimental Study of the Effects of Surround Brightness and Size on Visual Performance written by Fred H. Ireland and published by . This book was released on 1967 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A visual display must often be used in a setting where the surrounding visual field is brighter than the background area within the display. Such use violates a common human factors recommendation that the brightness of the display surround should be equal to, or slightly less than, that of the background in the display itself. The purpose of this experiment was to determine, quantitatively, the degradation in visibility due to high surround brightness and thus to provide useful data for the display system designer. Measurements were made of the target-to-background contrast required for each of 5 Ss to determine, with 50% accuracy, the orientation of a light Landolt ring target centered on a darker circular background. The target gap subtended 1.93 minutes of arc. Background angular subtense was varied from 5° to 45°, background brightness from 0.17 to 18.43 millilamberts and surround-to-background brightness ratio from 0:1 to 100:1. A uniform surround, independently variable in brightness with respect to the background, filled the rest of the visual field. The scene was viewed monocularly with natural pupil. The contrast limen was found to vary directly with surround-to-background brightness ratio for ratios greater than one. The variation with background size was smaller than predicted by an equation for integrating the effects of point sources of glare. An apparent tendency for a slight increase in limen as the surround-to-background ratio decreased from 1:1 to 0:1 was not statistically significant. Results are described by equations, and a procedure for their practical application is illustrated.
Book Synopsis Effects of Surround Illumination on Visual Performance by : Fred H. Ireland
Download or read book Effects of Surround Illumination on Visual Performance written by Fred H. Ireland and published by . This book was released on 1967 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A common human factors recommendation states that, for good target visibility, the area surrounding a display should not be brighter than the background area within the display. However, this recommendation must often be violated in applications where the surround brightness cannot be adequately controlled (e.g. in an airplane cockpit) and/or display technique limitations prevent use of high brightness backgrounds (e.g. with cathode ray tubes). This literature review was undertaken to see what has been discovered thus far concerning the effects on target visibility of specific parameters of a surround-to-background. Well over 100 documents were reviewed. Seventy-five annotated references to the more pertinent documents are contained in this report. Quantitative effects of pertinent parameters have been studied by numerous investigators. Results of studies using extended surrounds, rather than point sources, have not been sufficiently comprehensive or consistent to support quantitative generalizations in this area. Attempts have been made by Holladay and by Moon and Spencer to make quantitative predictions for the extended surround case on the basis of the more extensive body of data dealing with point source effects. However, several of the findings upon which their formulas are based have been contradicted by other findings cited in this report. (Author).
Book Synopsis Report on an Investigation of the High Speed Hazards of Steel Belted Radial Tires on Police Cars by : Jared J. Collard
Download or read book Report on an Investigation of the High Speed Hazards of Steel Belted Radial Tires on Police Cars written by Jared J. Collard and published by . This book was released on 1977 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Security Lighting for Nuclear Weapons Storage Sites by : Patrick G. Meguire
Download or read book Security Lighting for Nuclear Weapons Storage Sites written by Patrick G. Meguire and published by . This book was released on 1977 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1977 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Human Factors in Design and Control of Aircraft by :
Download or read book Human Factors in Design and Control of Aircraft written by and published by . This book was released on 1971 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flat-Panel Displays and CRTs by : Lawrence E. Tannas
Download or read book Flat-Panel Displays and CRTs written by Lawrence E. Tannas and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flat-Panel Displays and CRTs, a review of electronic information display devices, is the first sys tematic and comprehensive coverage of the subject. It is intended to distill our wealth of knowledge of flat-panel displays and CRTs from their beginnings to the present state of the art. Historical perspective, theory of operation, and specific applications are all thoroughly covered. The field of display engineering is a multidisciplined technical pursuit with the result that its individual disciplines suffer from a lack of communications and limited perspective. Many previ ously developed standards for, and general understanding of, one technology are often inappro priate for another. Care has been taken here to document the old, incorporate the new, and emphasize commonalities. Criteria for performance have been standardized to enable an expert in one display technology, such as liquid crystals, to compare his device performance with that offered by another technology, such as electroluminescence. This book has been written with a second purpose in mind, to wit, to be the vehicle by means of which a new scientist or engineer can be introduced into the display society. It is organized to be tutorial for use in instructional situations. The first chapters begin with first principles and defini tions; the middle chapters set out requirements and criteria; and the last chapters give a complete description of each major technology.
Book Synopsis OAR Cumulative Index of Research Results by :
Download or read book OAR Cumulative Index of Research Results written by and published by . This book was released on 1967 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Hazardous Materials Information Needs and Identification Systems for Transportation Purposes. Final Report by : Gustave J. Rath
Download or read book A Study of Hazardous Materials Information Needs and Identification Systems for Transportation Purposes. Final Report written by Gustave J. Rath and published by . This book was released on 1972 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Research Resumés written by and published by . This book was released on with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1967 with total page 1894 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Apollo 8 by : Manned Spacecraft Center (U.S.)
Download or read book Analysis of Apollo 8 written by Manned Spacecraft Center (U.S.) and published by . This book was released on 1969 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Apollo 8 observations of lunar topography.
Download or read book Air Force Research Resumés written by and published by . This book was released on 1968 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerospace Medicine and Biology written by and published by . This book was released on 1986 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into NASA scientific and technical information system and announced in Scientific and Technical Aerospace Reports (STAR), International Aerospace Abstracts (IAA).
Download or read book AMRL-TR. written by and published by . This book was released on 1968 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research & Development Reports by :
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1966-11 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
