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https://hdl.handle.net/2440/11964
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Type: | Journal article |
Title: | Accuracy of velocity estimation by Reichardt correlators |
Author: | Dror, R. O'Carroll, D. Laughlin, S. |
Citation: | Journal of the Optical Society of America A: Optics, Image Science and Vision, 2001; 18(2):241-252 |
Publisher: | Optical Soc Amer |
Issue Date: | 2001 |
ISSN: | 1084-7529 1520-8532 |
Statement of Responsibility: | R. O. Dror, D. C. O'Carroll, and S. B. Laughlin |
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. |
Keywords: | Animals Diptera Motion Perception Motion Models, Biological Time Factors Computer Simulation |
Description: | Copyright © 2001 Optical Society of America |
DOI: | 10.1364/JOSAA.18.000241 |
Published version: | http://josaa.osa.org/abstract.cfm?id=62946 |
Appears in Collections: | Aurora harvest 7 Physiology publications |
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