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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 23 — Aug. 10, 2003
  • pp: 4658–4662

Nonlinear filter for pattern recognition invariant to illumination and to out-of-plane rotations

Daniel Lefebvre, Henri H. Arsenault, and Sébastien Roy  »View Author Affiliations


Applied Optics, Vol. 42, Issue 23, pp. 4658-4662 (2003)
http://dx.doi.org/10.1364/AO.42.004658


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Abstract

Automatic target recognition in uncontrolled conditions is a difficult task because many parameters are involved. This study deals with the recognition of targets under limited out-of-plane rotations while maintaining invariance to ambient light illumination. Contrast invariance is achieved by using the recently developed locally adaptive contrast-invariant filter, a method that yields correlation peaks whose values are invariant under any linear transformation of intensity. To reduce the sensitivity to the orientation of the object we replace the reference in the nonlinear filter by a synthetic discriminant filter. The range used for out-of-plane rotations was 40 degrees with a depression angle of 20 degrees. We present results for unsegmented targets on complex backgrounds with the presence of false targets.

© 2003 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(070.4550) Fourier optics and signal processing : Correlators
(100.2000) Image processing : Digital image processing
(100.5010) Image processing : Pattern recognition
(150.2950) Machine vision : Illumination

History
Original Manuscript: November 1, 2002
Revised Manuscript: May 6, 2003
Published: August 10, 2003

Citation
Daniel Lefebvre, Henri H. Arsenault, and Sébastien Roy, "Nonlinear filter for pattern recognition invariant to illumination and to out-of-plane rotations," Appl. Opt. 42, 4658-4662 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-23-4658

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