Accuracy of velocity estimation by Reichardt correlators
Date
2001
Authors
Dror, R.
O'Carroll, D.
Laughlin, S.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Journal of the Optical Society of America A: Optics, Image Science and Vision, 2001; 18(2):241-252
Statement of Responsibility
R. O. Dror, D. C. O'Carroll, and S. B. Laughlin
Conference Name
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.
School/Discipline
Dissertation Note
Provenance
Description
Copyright © 2001 Optical Society of America