Mark Bobb


Many investigations of the detection threshold of the human visual system have been conducted, and a few recognition threshold studies can be found, however no identification threshold data are available. This paper documents research on the observer's identification threshold for an alphanumeric resolution test object presented at various average luminance levels, contrasts, and contrast polarities. These factors affected the identification threshold in a similar way to the effects they exert on the observer's detection and recognition thresholds; the test object contrast being the most significant factor. Direct numerical comparisons between the various thresholds were not possible due to the large inherent differences between the test object visual task complexities found in the many threshold investigations.

Library of Congress Subject Headings

Visual perception; Threshold (Perception)

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Kintz, Robert

Advisor/Committee Member

Hollis, Todd

Advisor/Committee Member

Schumann, Gerhard


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: BF241.B62


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