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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 5 — Feb. 10, 2003
  • pp: 811–819

Scale-invariant recognition of three-dimensional objects by use of a quasi-correlator

Youzhi Li and Joseph Rosen  »View Author Affiliations


Applied Optics, Vol. 42, Issue 5, pp. 811-819 (2003)
http://dx.doi.org/10.1364/AO.42.000811


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Abstract

A method of scale-invariant recognition of three-dimensional (3-D) objects is presented. Several images of the observed scene are recorded under white-light illumination from several different points of view and compressed into a single complex two-dimensional matrix. After filtering with a single scale-invariant filter, the resultant function is then coded into a computer-generated hologram (CGH). When this CGH is coherently illuminated, a correlation space is reconstructed in which light peaks indicate the existence and location of true targets in the tested 3-D scene. The light peaks are detectable for different sizes of the true objects, as long as they are within the invariance range of the filter. Experimental results in a complete electro-optical system are presented, and comparisons with other systems are investigated by use of computer simulation.

© 2003 Optical Society of America

OCIS Codes
(090.1760) Holography : Computer holography
(090.2870) Holography : Holographic display
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition
(100.5090) Image processing : Phase-only filters
(100.6890) Image processing : Three-dimensional image processing
(110.4190) Imaging systems : Multiple imaging
(110.6880) Imaging systems : Three-dimensional image acquisition

History
Original Manuscript: June 5, 2002
Revised Manuscript: September 3, 2002
Published: February 10, 2003

Citation
Youzhi Li and Joseph Rosen, "Scale-invariant recognition of three-dimensional objects by use of a quasi-correlator," Appl. Opt. 42, 811-819 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-5-811

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