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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Stephen A. Burns
  • Vol. 25, Iss. 2 — Feb. 1, 2008
  • pp: 312–317

Study of active millimeter-wave image speckle reduction by Hadamard phase pattern illumination

Gaetan Koers, Ilja Ocket, Qi Feng, Vahid Tavakol, Irina Jäger, Bart Nauwelaers, and Johan Stiens  »View Author Affiliations


JOSA A, Vol. 25, Issue 2, pp. 312-317 (2008)
http://dx.doi.org/10.1364/JOSAA.25.000312


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Abstract

Active millimeter-wave images typically exhibit characteristic speckle noise, due to the coherence of artificial millimeter-wave sources. We study the Hadamard speckle contrast reduction (SCR) technique, which has been successfully used in laser projection systems, in the context of millimeter-wave imaging. We show the impact of Hadamard pattern order and size and of image and pattern resolution on speckle reduction efficiency. Practical limitations of Hadamard pattern implementations and their effect on speckle reduction efficiency are also discussed.

© 2008 Optical Society of America

OCIS Codes
(030.0030) Coherence and statistical optics : Coherence and statistical optics
(030.4280) Coherence and statistical optics : Noise in imaging systems
(030.6140) Coherence and statistical optics : Speckle
(110.0110) Imaging systems : Imaging systems
(110.2945) Imaging systems : Illumination design

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: August 23, 2007
Manuscript Accepted: November 26, 2007
Published: January 10, 2008

Citation
Gaetan Koers, Ilja Ocket, Qi Feng, Vahid Tavakol, Irina Jäger, Bart Nauwelaers, and Johan Stiens, "Study of active millimeter-wave image speckle reduction by Hadamard phase pattern illumination," J. Opt. Soc. Am. A 25, 312-317 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-2-312

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