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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 13 — May. 1, 2006
  • pp: 2924–2934

Signal-to-noise analysis of task-based imaging systems with defocus

Paulo E. X. Silveira and Ramkumar Narayanswamy  »View Author Affiliations


Applied Optics, Vol. 45, Issue 13, pp. 2924-2934 (2006)
http://dx.doi.org/10.1364/AO.45.002924


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Abstract

We analyze the signal-to-noise ratio (SNR) of arbitrary imaging systems in the presence of defocus. The modulation transfer function (MTF) and the mean SNR are combined to calculate the spatial-frequency spectrum of the SNR (the spectral SNR). Computational imaging methods are used for extending the depth of field (DOF) of the system. The DOF of a task-specific imaging system is defined as the range of defocus that causes the spectral SNR to drop below a minimum value within a band of spatial frequencies of interest. We introduce the polar-SNR plot as a tool for visualizing the spectral SNR of defocused imaging systems with asymmetric pupil functions. As an example, we perform the analysis of an imaging system used for biometric iris recognition.

© 2006 Optical Society of America

OCIS Codes
(100.5010) Image processing : Pattern recognition
(110.2960) Imaging systems : Image analysis
(110.3000) Imaging systems : Image quality assessment
(110.4100) Imaging systems : Modulation transfer function
(110.4280) Imaging systems : Noise in imaging systems

ToC Category:
Performance Analysis

History
Original Manuscript: September 8, 2005
Revised Manuscript: October 25, 2005
Manuscript Accepted: October 25, 2005

Virtual Issues
Vol. 1, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Paulo E. X. Silveira and Ramkumar Narayanswamy, "Signal-to-noise analysis of task-based imaging systems with defocus," Appl. Opt. 45, 2924-2934 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-13-2924


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