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 http://resolver.caltech.edu/CaltechAUTHORS:20120531-084259752
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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.
|Additional Information:||© 1989 by Company of Biologists.|
|Subject Keywords:||motion, visual cortex, neuronal network, population coding|
|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.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||31 May 2012 16:00|
|Last Modified:||26 Dec 2012 15:17|
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