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Proceedings Paper

Aspheric optical elements for extended depth-of-field imaging
Author(s): Joseph van der Gracht; Edward R. Dowski; W. Thomas Cathey; John P. Bowen
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Paper 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.

Paper Details

Date Published: 11 August 1995
PDF: 10 pages
Proc. SPIE 2537, Novel Optical Systems Design and Optimization, (11 August 1995); doi: 10.1117/12.216392
Show Author Affiliations
Joseph van der Gracht, Army Research Lab. (United States)
Edward R. Dowski, Univ. of Colorado/Boulder (United States)
W. Thomas Cathey, Univ. of Colorado/Boulder (United States)
John P. Bowen, Rochester Photonics Corp. (United States)


Published in SPIE Proceedings Vol. 2537:
Novel Optical Systems Design and Optimization
Jose M. Sasian, Editor(s)

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