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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: Franco Gori
  • Vol. 30, Iss. 10 — Oct. 1, 2013
  • pp: 2012–2020

Discretization of continuous convolution operators for accurate modeling of wave propagation in digital holography

Nikhil Chacko, Michael Liebling, and Thierry Blu  »View Author Affiliations


JOSA A, Vol. 30, Issue 10, pp. 2012-2020 (2013)
http://dx.doi.org/10.1364/JOSAA.30.002012


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Abstract

Discretization of continuous (analog) convolution operators by direct sampling of the convolution kernel and use of fast Fourier transforms is highly efficient. However, it assumes the input and output signals are band-limited, a condition rarely met in practice, where signals have finite support or abrupt edges and sampling is nonideal. Here, we propose to approximate signals in analog, shift-invariant function spaces, which do not need to be band-limited, resulting in discrete coefficients for which we derive discrete convolution kernels that accurately model the analog convolution operator while taking into account nonideal sampling devices (such as finite fill-factor cameras). This approach retains the efficiency of direct sampling but not its limiting assumption. We propose fast forward and inverse algorithms that handle finite-length, periodic, and mirror-symmetric signals with rational sampling rates. We provide explicit convolution kernels for computing coherent wave propagation in the context of digital holography. When compared to band-limited methods in simulations, our method leads to fewer reconstruction artifacts when signals have sharp edges or when using nonideal sampling devices.

© 2013 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.2000) Image processing : Digital image processing
(090.1995) Holography : Digital holography
(070.7345) Fourier optics and signal processing : Wave propagation
(110.7410) Imaging systems : Wavelets

ToC Category:
Image Processing

History
Original Manuscript: May 10, 2013
Manuscript Accepted: August 8, 2013
Published: September 18, 2013

Citation
Nikhil Chacko, Michael Liebling, and Thierry Blu, "Discretization of continuous convolution operators for accurate modeling of wave propagation in digital holography," J. Opt. Soc. Am. A 30, 2012-2020 (2013)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-30-10-2012

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