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1 December 2007 Maximum a priori estimation of focus aberration in imaging systems
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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.
©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
David M. Strong and Stephen C. Cain "Maximum a priori estimation of focus aberration in imaging systems," Optical Engineering 46(12), 127006 (1 December 2007).
Published: 1 December 2007

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