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Optical Engineering

Maximum a priori estimation of focus aberration in imaging systems
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Paper Abstract

A maximum a priori (MAP) estimation technique for the detection of focus aberrations in electro-optical imaging systems is developed. The technique simplifies the equipment required in focus aberration detection over previous methodologies. The magnitude of the focus aberration is estimated from a single image. The MAP estimation technique uses a Poisson distribution of the photons arriving at the detector from the object. A Gaussian distribution is added to the statistical model to account for the focus aberration. Using the imaging system statistical model and real laboratory images from a charge-coupled device (CCD) camera, the focus aberration detection (FAD) algorithm produces estimates of the focus aberrations. The results demonstrate a viable approach for estimation and potential removal of focus aberrations in electro-optical systems, without the need to divert any light from the primary channel, or for additional complicated equipment and associated calibration requirements.

Paper Details

Date Published: 1 December 2007
PDF: 11 pages
Opt. Eng. 46(12) 127006 doi: 10.1117/1.2823493
Published in: Optical Engineering Volume 46, Issue 12
Show Author Affiliations
David M. Strong, Air Force Research Lab. (United States)
Stephen C. Cain, Air Force Institute of Technology (United States)

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