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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. 18, Iss. 2 — Feb. 1, 2001
  • pp: 241–252

Accuracy of velocity estimation by Reichardt correlators

Ron O. Dror, David C. O’Carroll, and Simon B. Laughlin  »View Author Affiliations


JOSA A, Vol. 18, Issue 2, pp. 241-252 (2001)
http://dx.doi.org/10.1364/JOSAA.18.000241


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Abstract

Although a great deal of experimental evidence supports the notion of a Reichardt correlator as a mechanism for biological motion detection, the correlator does not signal true image velocity. This study examines the accuracy with which realistic Reichardt correlators can provide velocity estimates in an organism’s natural visual environment. The predictable statistics of natural images imply a consistent correspondence between mean correlator response and velocity, allowing the otherwise ambiguous Reichardt correlator to act as a practical velocity estimator. Analysis and simulations suggest that processes commonly found in visual systems, such as prefiltering, response compression, integration, and adaptation, improve the reliability of velocity estimation and expand the range of velocities coded. Experimental recordings confirm our predictions of correlator response to broadband images.

© 2001 Optical Society of America

OCIS Codes
(150.4620) Machine vision : Optical flow
(330.4060) Vision, color, and visual optics : Vision modeling
(330.4150) Vision, color, and visual optics : Motion detection
(330.4270) Vision, color, and visual optics : Vision system neurophysiology

History
Original Manuscript: January 3, 2000
Revised Manuscript: September 20, 2000
Manuscript Accepted: September 20, 2000
Published: February 1, 2001

Citation
Ron O. Dror, David C. O’Carroll, and Simon B. Laughlin, "Accuracy of velocity estimation by Reichardt correlators," J. Opt. Soc. Am. A 18, 241-252 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-2-241


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