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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. 16, Iss. 4 — Apr. 1, 1999
  • pp: 804–811

Surround articulation. II. Lightness judgments

James A. Schirillo  »View Author Affiliations


JOSA A, Vol. 16, Issue 4, pp. 804-811 (1999)
http://dx.doi.org/10.1364/JOSAA.16.000804


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Abstract

It has been hypothesized that to achieve color constancy, lightness judgments require an estimate of the illuminant. A companion paper [J. Opt. Soc. Am. A 16, 793 (1999)] suggests that surround articulation enhances the likelihood that a global luminance edge will be interpreted as being due to changes in illumination rather than in reflectance. Articulation is the process of adding equally spaced incremental and decremental patches within a surround while preserving the surround’s space-average luminance. Such a process results in lightness judgments that correlate perfectly with equal local ratio matches. For decrements, lightness constancy does not require articulation. These findings help explain why Arend and Goldstein [J. Opt. Soc. Am. A 4, 2281 (1987)] obtained color constancy with complex Mondrian surrounds but not with simple center surrounds.

© 1999 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision

Citation
James A. Schirillo, "Surround articulation. II. Lightness judgments," J. Opt. Soc. Am. A 16, 804-811 (1999)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-16-4-804


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References

  1. J. A. Schirillo, “Surround articulation. II. Brightness judgments,” J. Opt. Soc. Am. A 16, 793–803 (1999).
  2. L. E. Arend and R. Goldstein, “Simultaneous constancy, lightness, and brightness,” J. Opt. Soc. Am. A 4, 2281–2285 (1987).
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  6. Since early Gestalt works involving articulation have not been elaborated upon, those authors’ specific statements are reproduced in Refs. 7891011.
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