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Computing motion in the primate's visual system

Koch, Christof and Wang, H. Taichi and Mathur, Bimal (1989) Computing motion in the primate's visual system. Journal of Experimental Biology, 146 (1). pp. 115-139. ISSN 0022-0949. PMCID 2689558. http://resolver.caltech.edu/CaltechAUTHORS:20120531-084259752

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Abstract

Computing motion on the basis of the time-varying image intensity is a difficult problem for both artificial and biological vision systems. We will show how one well-known gradient-based computer algorithm for estimating visual motion can be implemented within the primate's visual system. This relaxation algorithm computes the optical flow field by minimizing a variational functional of a form commonly encountered in early vision, and is performed in two steps. In the first stage, local motion is computed, while in the second stage spatial integration occurs. Neurons in the second stage represent the optical flow field via a population-coding scheme, such that the vector sum of all neurons at each location codes for the direction and magnitude of the velocity at that location. The resulting network maps onto the magnocellular pathway of the primate visual system, in particular onto cells in the primary visual cortex (V1) as well as onto cells in the middle temporal area (MT). Our algorithm mimics a number of psychophysical phenomena and illusions (perception of coherent plaids, motion capture, motion coherence) as well as electrophysiological recordings. Thus, a single unifying principle ‘the final optical flow should be as smooth as possible’ (except at isolated motion discontinuities) explains a large number of phenomena and links single-cell behavior with perception and computational theory.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://jeb.biologists.org/content/146/1/115.abstractPublisherArticle
http://www.ncbi.nlm.nih.gov/pubmed/2689558PubMed Central IDPubMed Article
Additional Information:© 1989 by Company of Biologists.
Group:Koch Laboratory, KLAB
Subject Keywords:motion, visual cortex, neuronal network, population coding
PubMed Central ID:2689558
Record Number:CaltechAUTHORS:20120531-084259752
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120531-084259752
Official Citation: C. Koch, H. T. Wang and B. Mathur Computing motion in the primate's visual system J Exp Biol 1989 146:115-139.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31733
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:31 May 2012 16:00
Last Modified:08 Oct 2013 17:23

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