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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 23, Iss. 10 — May. 15, 1984
  • pp: 1655–1670

Real-time depth measurement and display using Fresnel diffraction and white-light processing

James R. Leger and Michael A. Snyder  »View Author Affiliations


Applied Optics, Vol. 23, Issue 10, pp. 1655-1670 (1984)
http://dx.doi.org/10.1364/AO.23.001655


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Abstract

An optical method of measuring and displaying depth information has been developed which is based on the Fresnel diffraction properties of coherently illuminated gratings. Cosine modulated gratings are found to be more flexible than simple gratings for depth measurement. A pair of gratings crossed at right angles is used to provide two independent depth measurement channels. A real-time white-light processor has been developed to convert the depth information into pseudocolor. The depth signal is input to a white-light processor by a liquid crystal light valve. The two depth channels are filtered to produce different color images such that the hue of the combined image is a function of depth.

© 1984 Optical Society of America

History
Original Manuscript: October 15, 1983
Published: May 15, 1984

Citation
James R. Leger and Michael A. Snyder, "Real-time depth measurement and display using Fresnel diffraction and white-light processing," Appl. Opt. 23, 1655-1670 (1984)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-23-10-1655


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References

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