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Proceedings Paper

Two methods for increasing the depth of focus of imaging systems
Author(s): Emanuel Marom; E. Ben-Eliezer; Leonid P. Yaroslavsky; Zeev Zalevsky
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Paper Abstract

In this paper we describe two approaches for extending the depth of field in incoherent imaging system. The first one, a hybrid opto-digital incoherent imaging system, relies on an optical setup whereby the image is deliberately distorted, followed by a digital restoration stage. The second, an all-optical incoherent imaging system is based on a spatially code multiplexed multiple Fresnel lens mask, poisitioned in the lens aperture. Both provide a relatively high optical throughput and small contrast reduction, for an extremely wide range misfocus positions. For both cases, design considerations for an extended depth of field will be described. It is important to mention that both approaches are able to provide results in real time, thus enabling their usage in practical systems; yet the all-optical system presents a remarkable simplification.

Paper Details

Date Published: 30 September 2003
PDF: 8 pages
Proc. SPIE 5227, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, (30 September 2003); doi: 10.1117/12.519635
Show Author Affiliations
Emanuel Marom, Tel Aviv Univ. (Israel)
E. Ben-Eliezer, Tel Aviv Univ. (Israel)
Leonid P. Yaroslavsky, Tel Aviv Univ. (Israel)
Zeev Zalevsky, Tel Aviv Univ. (Israel)


Published in SPIE Proceedings Vol. 5227:
Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies
Ovidiu Iancu; Adrian Manea; Dan Cojoc, Editor(s)

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