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Proceedings Paper

Variable Contrast, Variable Color Resolution Target
Author(s): Robert J. Meltzer; Walter J. Wojcik
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Paper Abstract

An instrument developed for the U.S Air Force, the Variable Contrast Illuminator, permits continuous variation of the contrast and color of a bar target source. The target consists of transparent areas ruled through a reflecting substrate. The colors of the transparent areas, the reflecting areas, or an area superposed over both clear and reflecting areas may be independently varied. The color variations are formed by selective attenuation and synthesis of red, green, and blue light paths. The white light in tensities of transparent and reflecting areas may be independently varied to produce contrast ratios from over 1000:1 to 1:30, i.e. from bright areas on a dark surround to dark areas on a bright surround. Recently a company investigation has shown the feasibility of providing a ruled target with three bar patterns(√2 progression) extending from 3.2 lines per mm to 228 lines per mm.

Paper Details

Date Published: 1 November 1967
PDF: 4 pages
Proc. SPIE 0009, Photo-Optical Systems Evaluation, (1 November 1967); doi: 10.1117/12.978085
Show Author Affiliations
Robert J. Meltzer, Bausch & Lomb Incorporated (United States)
Walter J. Wojcik, Bausch & Lomb Incorporated (United States)


Published in SPIE Proceedings Vol. 0009:
Photo-Optical Systems Evaluation
Fred M. Emens, Editor(s)

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