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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

  • Vol. 15, Iss. 9 — Sep. 1, 1998
  • pp: 2327–2340

Object recognition based on impulse restoration with use of the expectation-maximization algorithm

Ahmad Abu-Naser, Nikolas P. Galatsanos, Miles N. Wernick, and Dan Schonfeld  »View Author Affiliations


JOSA A, Vol. 15, Issue 9, pp. 2327-2340 (1998)
http://dx.doi.org/10.1364/JOSAA.15.002327


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Abstract

It has recently been demonstrated that object recognition can be formulated as an image-restoration problem. In this approach, which we term impulse restoration, the objective is to restore a delta function that indicates the detected object’s location. We develop solutions based on impulse restoration for the Gaussian-noise case. We propose a new iterative approach, based on the expectation-maximization (EM) algorithm, that simultaneously estimates the background statistics and restores a delta function at the location of the template. We use a Monte Carlo study and localization-receiver-operating-characteristics curves to evaluate the performance of this approach quantitatively and compare it with existing methods. We present experimental results that demonstrate that impulse restoration is a powerful approach for detecting known objects in images severely degraded by noise. Our numerical experiments point out that the proposed EM-based approach is superior to all tested variants of the matched filter. This result demonstrates that accurate modeling and estimation of the background and noise statistics are crucial for realizing the full potential of impulse restoration-based template matching.

© 1998 Optical Society of America

OCIS Codes
(100.1830) Image processing : Deconvolution
(100.3010) Image processing : Image reconstruction techniques
(100.3020) Image processing : Image reconstruction-restoration
(100.5010) Image processing : Pattern recognition

History
Original Manuscript: October 6, 1997
Revised Manuscript: March 17, 1998
Manuscript Accepted: May 11, 1998
Published: September 1, 1998

Citation
Ahmad Abu-Naser, Nikolas P. Galatsanos, Miles N. Wernick, and Dan Schonfeld, "Object recognition based on impulse restoration with use of the expectation-maximization algorithm," J. Opt. Soc. Am. A 15, 2327-2340 (1998)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-15-9-2327


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