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

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

doi:10.1117/12.595995

6 April 2005 The effect of spatial noise of LCD displays on the detection capabilities of the human observer

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

Proceedings Volume 5749, Medical Imaging 2005: Image Perception, Observer Performance, and Technology Assessment; (2005) https://doi.org/10.1117/12.595995
Event: Medical Imaging, 2005, San Diego, California, United States

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.

Citation Download Citation

Kunal A. Gandhi, Jiahua Fan, Hans Roehrig, Malur K. Sundareshan, and Elizabeth A. Krupinski "The effect of spatial noise of LCD displays on the detection capabilities of the human observer", Proc. SPIE 5749, Medical Imaging 2005: Image Perception, Observer Performance, and Technology Assessment, (6 April 2005); https://doi.org/10.1117/12.595995

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