Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Conferences, Workshops, Symposiums, and Seminars
  4. Spectral Bandwidths for the Detection of Colour within Random Colour Textures
 
conference paper

Spectral Bandwidths for the Detection of Colour within Random Colour Textures

Monaci, Gianluca  
•
Menegaz, Gloria  
•
Süsstrunk, Sabine  
Show more
2003
Perception (supplement: 26th European Conference on Visual Perception)
26th European Conference on Visual Perception

We investigated the spectral properties of color detection mechanisms via a noise masking paradigm. Contrast detection thresholds were measured for equiluminant chromatic modulations in the (L-M,S-(L+M))-plane within a random texture. Each texture image was the spatial juxtaposition of color samples drawn from a bi-dimensional probability density function whose support was a sector in the equiluminant plane. The task consisted in the detection of an equiluminant signal of Gaussian shape (sigma = 1.25 deg) whose amplitude was the chromatic signal and whose pixel-wise chromaticity was spatially modulated by the noise. Each stimulus consisted of two textures (5 x 5 deg) arranged side-by-side and separated by a gap (width = 0.5 deg) with the same chromaticity as the uniform background. Subjects were asked to judge on which side of the central fixation point the signal was displayed via a 2AFC paradigm. Contrast thresholds were measured for four color directions and three sector widths at increasing levels of the average energy of the axial component of the noise. Results show that contrast thresholds are unaffected by the width of the noise sector, as previously found for temporally modulated stimuli (D'Zmura & Knoblauch, 1998). The results are consistent with the existence of spectrally broadband linear detection mechanisms tuned to the signal color direction and support the hypothesis of the existence of higher-order color mechanisms with sensitivities tuned to intermediate directions in the color space.

  • Details
  • Metrics
Type
conference paper
Web of Science ID

WOS:000185259600394

Author(s)
Monaci, Gianluca  
Menegaz, Gloria  
Süsstrunk, Sabine  
Knoblauch, Kenneth
Date Issued

2003

Published in
Perception (supplement: 26th European Conference on Visual Perception)
Volume

32

Start page

146

Subjects

IVRG

•

LTS1

•

LTS2

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
IVRL  
LTS2  
Event nameEvent place
26th European Conference on Visual Perception

Paris, France

Available on Infoscience
May 21, 2005
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/213951
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés