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Titolo:
Accuracy of velocity estimation by Reichardt correlators
Autore:
Dror, RO; OCarroll, DC; Laughlin, SB;
Indirizzi:
Univ Cambridge, Dept Zool, Cambridge CB2 3EJ, England Univ Cambridge Cambridge England CB2 3EJ ool, Cambridge CB2 3EJ, England
Titolo Testata:
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
fascicolo: 2, volume: 18, anno: 2001,
pagine: 241 - 252
SICI:
1084-7529(200102)18:2<241:AOVEBR>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAT STRIATE CORTEX; NATURAL IMAGES; RESPONSE PROPERTIES; MOVEMENT DETECTORS; MOTION DETECTORS; VISUAL-SYSTEM; STATISTICS; CELLS; FLY; COMPUTATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Dror, RO MIT, Dept Elect Engn & Comp Sci, Room 35-427,77 Massachusetts Ave, Cambridge, MA 02139 USA MIT Room 35-427,77 Massachusetts Ave Cambridge MAUSA 02139 9 USA
Citazione:
R.O. Dror et al., "Accuracy of velocity estimation by Reichardt correlators", J OPT SOC A, 18(2), 2001, pp. 241-252

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 estimatesin an organism's natural visual environment. The predictable statistics ofnatural images imply a consistent correspondence between mean correlator response and velocity, allowing the otherwise ambiguous Reichardt correlatorto act as a practical velocity estimator. Analysis and simulations suggestthat 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. (C) 2001 Optical Society of America OCIS codes: 330.4060, 330.4150, 330.4270, 150.4620.

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Documento generato il 27/01/20 alle ore 01:24:43