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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

  • Editor: Stephen A. Burns
  • Vol. 25, Iss. 11 — Nov. 1, 2008
  • pp: 2618–2629

Characteristics of grouping colors for figure segregation on a multicolored background

Takehiro Nagai and Keiji Uchikawa  »View Author Affiliations


JOSA A, Vol. 25, Issue 11, pp. 2618-2629 (2008)
http://dx.doi.org/10.1364/JOSAA.25.002618


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Abstract

A figure is segregated from its background when the colored elements belonging to the figure are grouped together. We investigated the range of color distribution conditions in which a figure could be segregated from its background using the color distribution differences. The stimulus was a multicolored texture composed of randomly shaped pieces. It was divided into two regions: a test region and a background region. The pieces in these two regions had different color distributions in the OSA Uniform Color Space. In our experiments, the subject segregated the figure of the test region using two different procedures. Since the Euclidean distance in the OSA Uniform Color Space corresponds to perceived color difference, if segregation thresholds are determined by only color difference, the thresholds should be independent of position and direction in the color space. In the results, however, the thresholds did depend on position and direction in the OSA Uniform Color Space. This suggests that color difference is not the only factor in figure segregation by color. Moreover, the threshold dependence on position and direction is influenced by the distances in the cone-opponent space whose axes are normalized by discrimination thresholds, suggesting that figure segregation threshold is determined by similar factors in the cone-opponent space for color discrimination. The analysis of the results by categorical color naming suggests that categorical color perception may affect figure segregation only slightly.

© 2008 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1720) Vision, color, and visual optics : Color vision
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: March 13, 2008
Revised Manuscript: August 13, 2008
Manuscript Accepted: August 21, 2008
Published: October 6, 2008

Virtual Issues
Vol. 4, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Takehiro Nagai and Keiji Uchikawa, "Characteristics of grouping colors for figure segregation on a multicolored background," J. Opt. Soc. Am. A 25, 2618-2629 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-11-2618


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