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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 2, Iss. 10 — Oct. 1, 1985
  • pp: 1769–1786

Intensity-dependent spatial summation

Tom N. Cornsweet and John I. Yellott, Jr.  »View Author Affiliations


JOSA A, Vol. 2, Issue 10, pp. 1769-1786 (1985)
http://dx.doi.org/10.1364/JOSAA.2.001769


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Abstract

Psychophysical evidence indicates that, in the human retina, the size of the spatial-summation area decreases as illuminance increases. Such a relationship would be beneficial for the detection of spatial contrast in the presence of photon noise. We analyze an image-processing mechanism in which the area of a strictly positive point-spread function varies inversely with local illuminance while its volume remains constant. In addition to its expected effect of improving spatial resolution as illuminance increases, this mechanism also yields center-surround antagonism and all other manifestations of bandpass filtering and accounts for Ricco’s law and Weber’s law—including the failures of both laws as a function of test conditions. The relationship between this mechanism and lateral inhibition is analyzed.

© 1985 Optical Society of America

History
Original Manuscript: November 13, 1984
Manuscript Accepted: April 16, 1985
Published: October 1, 1985

Citation
Tom N. Cornsweet and John I. Yellott, "Intensity-dependent spatial summation," J. Opt. Soc. Am. A 2, 1769-1786 (1985)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-2-10-1769

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