Abstract
Ever since Stiles and Holladay (1929), veiling glare (VG) in the human
visual system has been known to hinder the visibility of subtle targets. In
this work, we quantitatively study how veiling glare affects contrast detection
tasks using a dual-layer high-dynamic-range (HDR) display and empirically
model the VG effect on thresholds. We used a binary decision for the presence
of a Gaussian target in the center of the display on white noise backgrounds.
The VG source was realized using a ring pattern with varying parameters. Detection
thresholds were estimated using a double-random staircase technique including
signal absent trials. In addition, divergence of the subject's fixation from
the target in the center was tracked in real-time and used to provide auditory
feedback to minimize adaptation effects. Our results are interpreted in terms
of illuminance and angular distance between source and target. Sensitivity
was lower for smaller angular distances and for larger source intensities.
Results from three subjects were used to formulate a bivariate model of VG
effect for contrast thresholds similar to Stiles and Holladay. The model can
be used to suggest optimal, content-dependent, HDR presentation modes for
medical images.
© 2012 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription