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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. 18, Iss. 9 — Sep. 1, 2001
  • pp: 2041–2053

Characterizing the spatial-frequency sensitivity of perceptual templates

Zhong-Lin Lu and Barbara Anne Dosher  »View Author Affiliations


JOSA A, Vol. 18, Issue 9, pp. 2041-2053 (2001)
http://dx.doi.org/10.1364/JOSAA.18.002041


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Abstract

Filtered external noise has been an important tool in characterizing the spatial-frequency sensitivity of perceptual templates. Typically, low-pass- and/or high-pass-filtered external noise is added to the signal stimulus. Thresholds, the signal energy necessary to maintain given criterion performance levels, are measured as functions of the spatial-frequency passband of the external noise. An observer model is postulated to segregate the impact of the external noise and the internal noise. The spatial-frequency sensitivity of the perceptual template is determined by the relative impact exerted by external noise in each frequency band. The perceptual template model (PTM) is a general observer model that provides an excellent account of human performance in white external noise [Vision Res. 38, 1183 (1998); J. Opt. Soc. Am. A 16, 764 (1999)]. We further develop the PTM for filtered external noise and apply it to derive the spatial-frequency sensitivity of perceptual templates.

© 2001 Optical Society of America

OCIS Codes
(330.1880) Vision, color, and visual optics : Detection
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5000) Vision, color, and visual optics : Vision - patterns and recognition
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.6110) Vision, color, and visual optics : Spatial filtering

History
Original Manuscript: July 13, 2000
Revised Manuscript: February 13, 2001
Manuscript Accepted: February 13, 2001
Published: September 1, 2001

Citation
Zhong-Lin Lu and Barbara Anne Dosher, "Characterizing the spatial-frequency sensitivity of perceptual templates," J. Opt. Soc. Am. A 18, 2041-2053 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-9-2041


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  76. This approximation becomes exact if (i) Ts(fx, fy)=Ts(f ) and F(fx, fy)=F(f ); that is, the template and the experimenter-applied filter are radially symmetric in Fourier space; or (ii) Ts(fx, fy)=kF(fx, fy),∀fx,fy; that is, the template is matched to the noise filter; or (iii) either the template or the noise filter (or both) are uniform for every radius where the template and the noise filter overlap in Fourier space. In the current application, F(fx, fy)= F(f )=constant, the expected spectrum of the Gaussian noise is uniform, and condition (iii) is met. In most applications it will be possible to construct filters such that condition (iii) holds.
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