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Proceedings Paper

The effect of spatial noise of LCD displays on the detection capabilities of the human observer
Author(s): Kunal A. Gandhi; Jiahua Fan; Hans Roehrig; Malur K. Sundareshan; Elizabeth A. Krupinski
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Paper Abstract

This paper presents results of physical as well as psychophysical evaluations of an LCD with respect to its spatial noise. Spatial noise is quantified using a high-resolution CCD camera and a method is developed to compensate for it. This compensation method is based on a spatial noise map, derived from the CCD camera images, and on the application of an error diffusion algorithm. This method of noise compensation reduces the spatial noise by about a factor of 2. Psychophysical evaluation is performed in order to explore the dependence of human contrast sensitivity on display spatial noise. This evaluation uses the two-alternative forced choice (2-AFC) method. Aperiodic Gaussian-shaped objects, which simulate lung nodules, serve as stimuli. The detectability index, d', calculated indicates that spatial noise compensation leads to a lower contrast threshold.

Paper Details

Date Published: 6 April 2005
PDF: 11 pages
Proc. SPIE 5749, Medical Imaging 2005: Image Perception, Observer Performance, and Technology Assessment, (6 April 2005); doi: 10.1117/12.595995
Show Author Affiliations
Kunal A. Gandhi, Univ. of Arizona (United States)
Jiahua Fan, Univ. of Arizona (United States)
Hans Roehrig, Univ. of Arizona (United States)
Optical Sciences Ctr./Univ. of Arizona (United States)
Malur K. Sundareshan, Univ. of Arizona (United States)
Elizabeth A. Krupinski, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 5749:
Medical Imaging 2005: Image Perception, Observer Performance, and Technology Assessment
Miguel P. Eckstein; Yulei Jiang, Editor(s)

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