Extended depth of field in hybrid imaging systems: circular aperture

Author： Sherif Sherif S. Dowski Ed R. Cathey W. Thomas

ISSN： 1362-3044

Source： Journal of Modern Optics, Vol.51, Iss.8, 2004-05, pp. : 1191-1209

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Abstract

A hybrid imaging system combines a modified optical imaging system and a digital post-processing step. A spatial-domain method is described to design a pupil phase plate to extend the depth of field of an incoherent hybrid imaging system with a circular aperture. This method is used to obtain a pupil phase plate to extend the depth of field, and is referred to as the EDF circular phase plate. By introducing an EDF circular phase plate at the exit pupil of a simulated diffraction-limited system and digitally processing the output of the detector, the depth of field is extended by approximately an order of magnitude more than the Hopkins defocus criterion.