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Proceedings Paper

A comparison between 8-bit and 10-bit luminance resolution when generating low-contrast sinusoidal test pattern on an LCD
Author(s): Patrik Sund; Magnus Båth; Linda Ungsten; Lars Gunnar Månsson
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Paper Abstract

Radiological images are today mostly displayed on monitors, but much is still unknown regarding the interaction between monitor and viewer. Issues like monitor luminance range, calibration, contrast resolution and luminance distribution need to be addressed further. To perform vision research of high validity to the radiologists, test images should be presented on medical displays. One of the problems has been how to display low contrast patterns in a strictly controlled way. This paper demonstrates how to generate test patterns close to the detection limit on a medical grade display using subpixel modulation. Patterns are generated with both 8-bit and 10-bit monitor input. With this technique, up to 7162 luminance levels can be displayed and the average separation is approximately 0.08 of a JND (Just Noticeable Difference) on a display with a luminance range between 1 and 400 cd/m2. These patterns were used in a 2AFC detection task and the detection threshold was found to be 0.75 ± 0.02 of a JND when the adaptation level was the same as the target luminance (20 cd/m2). This is a reasonable result considering that the magnitude of a JND is based on the method of adjustment rather than on a detection task. When test patterns with a different luminance than the adaptation level (20 cd/m2) were displayed, the detection thresholds were 1.11 and 1.06 of a JND for target luminance values 1.8 and 350 cd/m2, respectively.

Paper Details

Date Published: 8 March 2007
PDF: 10 pages
Proc. SPIE 6515, Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment, 65150O (8 March 2007); doi: 10.1117/12.709248
Show Author Affiliations
Patrik Sund, Sahlgrenska Univ. Hospital (Sweden)
Göteborg Univ. (Sweden)
Magnus Båth, Sahlgrenska Univ. Hospital (Sweden)
Göteborg Univ. (Sweden)
Linda Ungsten, Sahlgrenska Univ. Hospital (Sweden)
Lars Gunnar Månsson, Sahlgrenska Univ. Hospital (Sweden)
Göteborg Univ. (Sweden)

Published in SPIE Proceedings Vol. 6515:
Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment
Yulei Jiang; Berkman Sahiner, Editor(s)

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