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Optical Engineering

Display nonlinearity in digital image processing for visual communications
Author(s): Eli Peli
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Paper Abstract

The luminance emitted from a cathode ray rube (CRT) display is a nonlinear function (the gamma function) of the input video signal voltage. In most analog video systems, compensation for this nonlinear transfer function is implemented in the camera amplifiers. When CRT displays are used to present psychophysical stimuli in vision research, the specific display nonlinearity usually is measured and accounted for to ensure that the luminance of each pixel in the synthetic image properly represents the intended value. However, when using digital image processing, the linear analog-to-digital converters store a digital image that is nonlinearly related to the displayed or recorded image. The effect of this nonlinear transformation on a variety of image-processing applications used in visual communications is described.

Paper Details

Date Published: 1 November 1992
PDF: 9 pages
Opt. Eng. 31(11) doi: 10.1117/12.59989
Published in: Optical Engineering Volume 31, Issue 11
Show Author Affiliations
Eli Peli, Eye Research Institute (United States)

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