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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 12666–12674

Improved particle size estimation in digital holography via sign matched filtering

Jiang Lu, Raymond A. Shaw, and Weidong Yang  »View Author Affiliations


Optics Express, Vol. 20, Issue 12, pp. 12666-12674 (2012)
http://dx.doi.org/10.1364/OE.20.012666


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Abstract

A matched filter method is provided for obtaining improved particle size estimates from digital in-line holograms. This improvement is relative to conventional reconstruction and pixel counting methods for particle size estimation, which is greatly limited by the CCD camera pixel size. The proposed method is based on iterative application of a sign matched filter in the Fourier domain, with sign meaning the matched filter takes values of ±1 depending on the sign of the angular spectrum of the particle aperture function. Using simulated data the method is demonstrated to work for particle diameters several times the pixel size. Holograms of piezoelectrically generated water droplets taken in the laboratory show greatly improved particle size measurements. The method is robust to additive noise and can be applied to real holograms over a wide range of matched-filter particle sizes.

© 2012 OSA

OCIS Codes
(070.4550) Fourier optics and signal processing : Correlators
(100.5090) Image processing : Phase-only filters
(090.1995) Holography : Digital holography

ToC Category:
Holography

History
Original Manuscript: March 1, 2012
Revised Manuscript: May 8, 2012
Manuscript Accepted: May 12, 2012
Published: May 21, 2012

Citation
Jiang Lu, Raymond A. Shaw, and Weidong Yang, "Improved particle size estimation in digital holography via sign matched filtering," Opt. Express 20, 12666-12674 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-12-12666


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