In search of a contrast metric: matching the perceived contrast of Gabor patches at different phases and bandwidths

Vision Research
E Peli

Abstract

The definition of contrast in a complex scene is a long-standing problem. The local contrast in an image may be approximated by the contrast of a Gabor patch of varying phase and bandwidth. Observers' perceived (apparent) contrast, as indicated by matching of such patterns, were compared here to the physical contrast calculated by a number of definitions. The 2 c/deg 1-octave Gabor patch stimuli of different phases were presented side by side, separated by 4 deg. During each session the subjects (n = 5) were adapted to the average luminance, and four different contrast levels were randomly interleaved. The subject's task was to indicate which of the two patterns was lower in contrast. Equal apparent contrast was determined by fitting a psychometric function to the data. The results of the matching rejected the hypothesis that either the Michelson formula or the King-Smith and Kulikowski contrast metric (CKK = (Lmax-Lbackground)/Lbackground) was used by the subjects to set the matching. The use of the Nominal contrast (the Michelson contrast of the underlying sinusoid) as an estimate of apparent contrast could not be rejected. In a second experiment the apparent contrast of a 1-octave Gabor patch was matched to the apparent cont...Continue Reading

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Citations

Feb 22, 2011·The Quarterly Journal of Experimental Psychology : QJEP·Rocı O Alcala-Quintana, Miguel A Garcı A-Perez
Jul 15, 2006·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Hao SunWilliam H Swanson
Jul 28, 2009·Attention, Perception & Psychophysics·Sonja EngmannWolfgang Einhäuser
Mar 14, 2013·Journal of the Society for Information Display·Andrew HaunEli Peli
May 31, 2007·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Ming MeiJeffery Hovis
Feb 5, 2008·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Martin Kutter, Stefan Winkler
Feb 1, 2012·Vision Research·Daniel H BakerTim S Meese
Sep 11, 2004·Vision Research·Casimir J H LudwigEugene McSorley
Jan 31, 2004·Vision Research·Cheryl A OlmanDaniel Kersten
Sep 9, 2016·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Rushi Lan, Yicong Zhou
Aug 15, 2003·Human Factors·Gary Witus, R Darin Ellis
Apr 10, 2021·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Samantha O BrownCharles W Bradberry

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