High depth-of-field imaging without sacrificing light-gathering power and resolution

Alan R. FitzGerrell; Edward R. Dowski Jr.

doi:10.1117/12.285587

18 September 1997 High depth-of-field imaging without sacrificing light-gathering power and resolution

Alan R. FitzGerrell, Edward R. Dowski Jr.

Proceedings Volume 3205, Machine Vision Applications, Architectures, and Systems Integration VI; (1997) https://doi.org/10.1117/12.285587
Event: Intelligent Systems and Advanced Manufacturing, 1997, Pittsburgh, PA, United States

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.

Citation Download Citation

Alan R. FitzGerrell and Edward R. Dowski Jr. "High depth-of-field imaging without sacrificing light-gathering power and resolution", Proc. SPIE 3205, Machine Vision Applications, Architectures, and Systems Integration VI, (18 September 1997); https://doi.org/10.1117/12.285587

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