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Proceedings Paper

High depth-of-field imaging without sacrificing light-gathering power and resolution
Author(s): Alan R. FitzGerrell; Edward R. Dowski Jr.
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Paper Abstract

The traditional method of improving the depth-of-field of an imaging system is to stop down the aperture. Light gathering power and resolution are lost. We present a modified CCD camera system which achieves exceptionally high depth-of-field without stopping down the aperture. A special phase mask placed near the lens modifies the incoming wavefront making it nearly invariant to the state of focus. The resulting image has reduced contrast but still contains complete object information. Straightforward post-processing is then used to regain image contrast. In effect, we trade image SNR instead of aperture size to obtain high depth-of-field.

Paper Details

Date Published: 18 September 1997
PDF: 12 pages
Proc. SPIE 3205, Machine Vision Applications, Architectures, and Systems Integration VI, (18 September 1997); doi: 10.1117/12.285587
Show Author Affiliations
Alan R. FitzGerrell, Vexcel Corp. (United States)
Edward R. Dowski Jr., CDM Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 3205:
Machine Vision Applications, Architectures, and Systems Integration VI
Susan Snell Solomon; Bruce G. Batchelor; John W. V. Miller, Editor(s)

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