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Proceedings Paper

Separating the effects of glare from simultaneous contrast
Author(s): Alessandro Rizzi; Marzia Pezzetti; John J. McCann
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Paper Abstract

Appearance in High Dynamic Range images is controlled by intraocular glare and physiological spatial contrast. Increasing the number of high luminance pixels in a display increases glare and reduces the dynamic range of luminances on the retina. Simultaneous contrast makes areas with higher glare related luminances look darker. Previous experiments measured the range needed for the appearance black in surrounds with variable percentage of white pixels in the background. In these test targets it was 2.0 log units with 100% white pixels, 2.3 log units with 50% white pixels, 2.9 log units with 8% white pixels, and 5.5 log units with 0% white pixels. We want to calculate the intensity of veiling glare in these test scenes and relate retinal luminances to the magnitude estimates of appearance reported by observers. This paper uses a glare spread function to calculate the retinal luminances after intraocular scatter. By modeling the actual luminances on the retina we can compare them with appearance.

Paper Details

Date Published: 13 February 2008
PDF: 9 pages
Proc. SPIE 6806, Human Vision and Electronic Imaging XIII, 68060A (13 February 2008); doi: 10.1117/12.766743
Show Author Affiliations
Alessandro Rizzi, Univ. degli Studi di Milano (Italy)
Marzia Pezzetti, Univ. degli Studi di Milano (Italy)
John J. McCann, McCann Imaging (United States)


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

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