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11 August 1995 Aspheric optical elements for extended depth-of-field imaging
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Abstract
We provide experimental verification of the performance of an optical-digital imaging system that delivers near diffraction limited imaging over a wide depth of field. A custom aspheric optical element is used to modify an incoherent optical system so that the generated optical image is nearly independent of misfocus-induced blur. The resulting image, called an intermediate image, is not spatially diffraction limited. Digital processing of the intermediate image produces a final image that forms a close approximation to the diffraction limited image. The combined effect of the optical-digital system is to image objects independently of focus or range, that is, the system has an extended depth of field.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph van der Gracht, Edward R. Dowski Jr., W. Thomas Cathey Jr., and John P. Bowen "Aspheric optical elements for extended depth-of-field imaging", Proc. SPIE 2537, Novel Optical Systems Design and Optimization, (11 August 1995); https://doi.org/10.1117/12.216392
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