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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 31, Iss. 1 — Jan. 1, 1992
  • pp: 120–125

Image speckle contrast reduction resulting from integrative synthetic aperture imaging

Louis Sica  »View Author Affiliations


Applied Optics, Vol. 31, Issue 1, pp. 120-125 (1992)
http://dx.doi.org/10.1364/AO.31.000120


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Abstract

Reduction of image speckle noise with the use of an integrative synthetic aperture imaging technique is studied. It is found that the Fourier inversion of the mutual intensity estimate [ Appl. Opt. 30, 206– 213 ( 1991)] yields an image intensity that corresponds exactly to the illumination of the object with partially coherent light from source optics imaging a delta-function incoherent source. An expression for the signal-to-noise ratio at an image point is derived for a large rough object with delta-function correlated amplitude reflection. A synthetic aperture system receiver of sufficiently small diameter yields image speckle with a signal-to-noise ratio (SNR) equal to 1. When the receiver and the transmitter diameters are equal, the SNR is 2 for linearly polarized speckle. The SNR continues to increase with receiver size and is linear in the diameter for large receiver-to-transmitter diameter ratios.

© 1992 Optical Society of America

History
Original Manuscript: November 19, 1990
Published: January 1, 1992

Citation
Louis Sica, "Image speckle contrast reduction resulting from integrative synthetic aperture imaging," Appl. Opt. 31, 120-125 (1992)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-31-1-120

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