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Proceedings Paper

Automated testing of visual instruments and the problem of best focus
Author(s): Pantazis Z. Mouroulis; Xiaoxue Cheng; Kevin P. Lyons
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Paper Abstract

We discuss the problem of how to determine the optimum focus during MTF or similar observerless testing of visual instruments. We review the literature to show that the most commonly employed method, maximization of the response at a single spatial frequency, can lead to very large errors in predicting the visual quality of an instrument. We propose alternative criteria, and examine their behavior through focus and in the presence of aberrations. Current data support the assertion that an appropriately defined radius of encircled energy, or an averaged MTF integral, are the best candidates to serve both as general image quality criteria and as a means for determining the optimum focus. We conclude by proposing an experiment that should resolve any remaining questions.

Paper Details

Date Published: 25 November 1993
PDF: 10 pages
Proc. SPIE 2000, Current Developments in Optical Design and Optical Engineering III, (25 November 1993); doi: 10.1117/12.163636
Show Author Affiliations
Pantazis Z. Mouroulis, Rochester Institute of Technology (United States)
Xiaoxue Cheng, Rochester Institute of Technology (United States)
Kevin P. Lyons, Rochester Institute of Technology (United States)


Published in SPIE Proceedings Vol. 2000:
Current Developments in Optical Design and Optical Engineering III
Robert E. Fischer; Warren J. Smith, Editor(s)

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