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Proceedings Paper

Perception-based contrast enhancement model for complex images in high dynamic range
Author(s): Akiko Yoshida; Grzegorz Krawczyk; Karol Myszkowski; Hans-Peter Seidel
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Paper Abstract

Contrast in image processing is typically scaled using a power function (gamma) where its exponent specifies the amount of the physical contrast change. While the exponent is normally constant for the whole image, we observe that such scaling leads to perceptual nonuniformity in the context of high dynamic range (HDR) images. This effect is mostly due to lower contrast sensitivity of the human eyes for the low luminance levels. Such levels can be reproduced by an HDR display while they can not be reproduced by standard display technology. We conduct two perceptual experiments on a complex image: contrast scaling and contrast discrimination threshold, and we derive a model which relates changes of physical and perceived contrasts at different luminance levels. We use the model to adjust the exponent value such that we obtain better perceptual uniformity of global and local contrast scaling in complex images.

Paper Details

Date Published: 13 February 2008
PDF: 11 pages
Proc. SPIE 6806, Human Vision and Electronic Imaging XIII, 68060C (13 February 2008); doi: 10.1117/12.766500
Show Author Affiliations
Akiko Yoshida, Max-Planck-Institut für Informatik (Germany)
Grzegorz Krawczyk, Max-Planck-Institut für Informatik (Germany)
Karol Myszkowski, Max-Planck-Institut für Informatik (Germany)
Hans-Peter Seidel, Max-Planck-Institut für Informatik (Germany)

Published in SPIE Proceedings Vol. 6806:
Human Vision and Electronic Imaging XIII
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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