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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 26, Iss. 21 — Nov. 1, 1987
  • pp: 4612–4615

Optical/digital incoherent image processing for extended depth of field

Ting-Chung Poon and Masoud Motamedi  »View Author Affiliations


Applied Optics, Vol. 26, Issue 21, pp. 4612-4615 (1987)
http://dx.doi.org/10.1364/AO.26.004612


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Abstract

For a severely defocused incoherent system, its optical transfer function (OTF) has isolated zeros; therefore, an exact inverse filtering cannot be performed. Isolated zeros in the OTF can be avoided by choosing an annular aperture with a proper radius ratio, as the aperture can extend the depth of focus of the system. However, in the process of increasing the depth of focus of the system, this method results in a loss of image contrast. A simple hybrid optical/digital image processing system in which a TV camera device is coupled with an annular aperture is considered. Annular-pass filtering to compensate for the loss of contrast is performed by a digital computer. Experimental results are presented.

© 1987 Optical Society of America

History
Original Manuscript: March 26, 1987
Published: November 1, 1987

Citation
Ting-Chung Poon and Masoud Motamedi, "Optical/digital incoherent image processing for extended depth of field," Appl. Opt. 26, 4612-4615 (1987)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-26-21-4612


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References

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