The effect of spatial noise of LCD displays on the detection capabilities of the human observer

Kunal Gandhi, Jiahua Fan, Hans Roehrig, Malur K. Sundareshan, Elizabeth Krupinski

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


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.

Original languageEnglish (US)
Article number59
Pages (from-to)538-548
Number of pages11
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
StatePublished - Sep 19 2005
EventMedical Imaging 2005 - Image Perception, Observer Performance, and Technology Assessment - San Diego, CA, United States
Duration: Feb 15 2005Feb 17 2005


  • Error diffusion
  • LCD
  • Spatial noise
  • Two-alternative forced choice

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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