Document Detail

Model of human visual-motion sensing.
MedLine Citation:
PMID:  3973764     Owner:  NLM     Status:  MEDLINE    
We propose a model of how humans sense the velocity of moving images. The model exploits constraints provided by human psychophysics, notably that motion-sensing elements appear tuned for two-dimensional spatial frequency, and by the frequency spectrum of a moving image, namely, that its support lies in the plane in which the temporal frequency equals the dot product of the spatial frequency and the image velocity. The first stage of the model is a set of spatial-frequency-tuned, direction-selective linear sensors. The temporal frequency of the response of each sensor is shown to encode the component of the image velocity in the sensor direction. At the second stage, these components are resolved in order to measure the velocity of image motion at each of a number of spatial locations and spatial frequencies. The model has been applied to several illustrative examples, including apparent motion, coherent gratings, and natural image sequences. The model agrees qualitatively with human perception.
A B Watson; A J Ahumada
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics and image science     Volume:  2     ISSN:  0740-3232     ISO Abbreviation:  J Opt Soc Am A     Publication Date:  1985 Feb 
Date Detail:
Created Date:  1985-03-22     Completed Date:  1985-03-22     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8402086     Medline TA:  J Opt Soc Am A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  322-41     Citation Subset:  IM; S    
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MeSH Terms
Adaptation, Ocular
Differential Threshold
Discrimination (Psychology)
Fourier Analysis
Models, Psychological*
Motion Perception / physiology*
Space Perception
Time Factors
Visual Perception / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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