Abstract

The principal investigator examines a three stage model of image processing comprising a first stage of oriented filters, a nonlinearity and a second stage of oriented filters of much lower preferred spatial frequency. This model has evolved from experiments on texture segmentation and the current proposal refines some of the parameters of the model and tests its generality.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY008459-09
Application #
2711025
Study Section
Visual Sciences B Study Section (VISB)
Project Start
1989-12-01
Project End
2000-04-30
Budget Start
1998-09-01
Budget End
2000-04-30
Support Year
9
Fiscal Year
1998
Total Cost
Indirect Cost

  Institution

Name
Columbia University (N.Y.)
Department
Psychology
Type
Other Domestic Higher Education
DUNS #
064931884
City
New York
State
NY
Country
United States
Zip Code
10027

  Publications

Graham, Norma V; Wolfson, S Sabina (2018) Is the straddle effect in contrast perception limited to second-order spatial vision? J Vis 18:15
Wolfson, S Sabina; Graham, Norma (2009) Two contrast adaptation processes: contrast normalization and shifting, rectifying contrast comparison. J Vis 9:30.1-23
Wolfson, S Sabina; Graham, Norma (2007) An unusual kind of contrast adaptation: shifting a contrast comparison level. J Vis 7:12
Wolfson, S Sabina; Graham, Norma (2006) Forty-four years of studying light adaptation using the probed-sinewave paradigm. J Vis 6:1026-46
Wolfson, S Sabina; Graham, Norma (2005) Element-arrangement textures in multiple objective tasks. Spat Vis 18:209-26
Graham, Norma; Wolfson, S Sabina (2004) Is there opponent-orientation coding in the second-order channels of pattern vision? Vision Res 44:3145-75
Wolfson, S S; Graham, N (2001) Comparing increment and decrement probes in the probed-sinewave paradigm. Vision Res 41:1119-31
Graham, N; Wolfson, S S (2001) A note about preferred orientations at the first and second stages of complex (second-order) texture channels. J Opt Soc Am A Opt Image Sci Vis 18:2273-81
Wolfson, S S; Graham, N (2001) Processing in the probed-sinewave paradigm is likely retinal. Vis Neurosci 18:1003-10
Wolfson, S S; Graham, N (2000) Exploring the dynamics of light adaptation: the effects of varying the flickering background's duration in the probed-sinewave paradigm. Vision Res 40:2277-89

Showing the most recent 10 out of 23 publications