Automated testing of visual instruments and the problem of best focus

Pantazis Z. Mouroulis; Xiaoxue Cheng; Kevin P. Lyons

doi:10.1117/12.163636

25 November 1993 Automated testing of visual instruments and the problem of best focus

Pantazis Z. Mouroulis, Xiaoxue Cheng, Kevin P. Lyons

Proceedings Volume 2000, Current Developments in Optical Design and Optical Engineering III; (1993) https://doi.org/10.1117/12.163636
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

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Pantazis Z. Mouroulis, Xiaoxue Cheng, and Kevin P. Lyons "Automated testing of visual instruments and the problem of best focus", Proc. SPIE 2000, Current Developments in Optical Design and Optical Engineering III, (25 November 1993); https://doi.org/10.1117/12.163636

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KEYWORDS

Modulation transfer functions

Monochromatic aberrations

Visualization

Image quality

Eye

Point spread functions

Spatial frequencies

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