scholarly journals A Normative Data Set for the Clinical Assessment of Achromatic and Chromatic Contrast Sensitivity Using a qCSF Approach

2018 ◽  
Vol 58 (9) ◽  
pp. 3628 ◽  
Author(s):  
Yeon Jin Kim ◽  
Alexandre Reynaud ◽  
Robert F. Hess ◽  
Kathy T. Mullen
Keyword(s):  
Contrast Sensitivity ◽  
Clinical Assessment ◽  
Normative Data ◽  
Chromatic Contrast ◽  
Data Set ◽  
Chromatic Contrast Sensitivity

Modeling chromatic contrast sensitivity across different background colors and luminance

2021 ◽  
Vol 2021 (29) ◽  
pp. 99-104
Author(s):  
Marcel Lucassen ◽  
Dragan Sekulovski ◽  
Marc Lambooij ◽  
Qiang Xu ◽  
Ronnier Luo
Keyword(s):  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Constant Stimulus ◽  
Stimulus Size ◽  
Experimental Paradigm ◽  
Chromatic Contrast ◽  
Data Set ◽  
Contrast Model ◽  
Model Based ◽  
Chromatic Contrast Sensitivity

In this research we compare chromatic contrast sensitivity models for two separate datasets and for the pooled dataset. They were obtained from two studies employing a very similar experimental paradigm. The data represent threshold visibilities of chromatic Gabor patterns varying in spatial frequency, background chromaticity, direction of color modulation and luminance, at constant stimulus size. Using the extended data set, we reconfirm our previously reported finding that a model based on coloropponent contrast signals is an improvement over a cone contrast model. However, when linear background scaling in classic cone contrast is replaced by nonlinear background scaling, an improvement of almost similar size is obtained. The results of this study can be of interest for the development of vision models employing the processing of spatio-chromatic information.

scholarly journals Spatio-chromatic contrast sensitivity under mesopic and photopic light levels

2020 ◽  
Vol 20 (4) ◽  
pp. 23
Author(s):  
Sophie Wuerger ◽  
Maliha Ashraf ◽  
Minjung Kim ◽  
Jasna Martinovic ◽  
María Pérez-Ortiz ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Chromatic Contrast ◽  
Light Levels ◽  
Chromatic Contrast Sensitivity

scholarly journals Luminance and chromatic contrast sensitivity at high light levels

2019 ◽  
Vol 19 (10) ◽  
pp. 70b ◽  
Author(s):  
Sophie Wuerger ◽  
Rafal Mantiuk ◽  
Maria Perez-Ortiz ◽  
Jasna Martinovic
Keyword(s):  
Contrast Sensitivity ◽  
High Light ◽  
Chromatic Contrast ◽  
Light Levels ◽  
Chromatic Contrast Sensitivity

Investigation of Chromatic Contrast Sensitivity Based on Different Color Directions and Spatial Frequencies

2011 ◽  
Vol 31 (1) ◽  
pp. 0133002 ◽  
Author(s):  
吕玮阁 Lü Weige ◽  
徐海松 Xu Haisong ◽  
汪哲弘 Wang Zhehong ◽  
M. Ronnier Luo M. Ronnier Luo
Keyword(s):  
Contrast Sensitivity ◽  
Chromatic Contrast ◽  
Spatial Frequencies ◽  
Different Color ◽  
Chromatic Contrast Sensitivity

Spatial Integration of Objectively Equiluminous Chromatic Gratings

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 200-200
Author(s):  
M I Kankaanpää ◽  
J Rovamo ◽  
H T Kukkonen ◽  
J Hallikainen
Keyword(s):  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Spatial Integration ◽  
Chromatic Contrast ◽  
Shape Difference ◽  
Sensitivity Functions ◽  
Spatial Frequencies ◽  
Low Pass ◽  
Chromatic Aberrations ◽  
Chromatic Contrast Sensitivity

Contrast sensitivity functions for achromatic and chromatic gratings tend to be band-pass and low-pass in shape, respectively. Our aim was to test whether spatial integration contributes to the shape difference found at low spatial frequencies. We measured binocular chromatic contrast sensitivity as a function of grating area for objectively equiluminous red - green and blue - yellow chromatic gratings. Chromatic contrast refers to the Michelson contrast of either of the two chromatic component gratings presented in counterphase against the combined background. Grating area ( A) varied from 1 to 256 square cycles ( Af2) at spatial frequencies ( f) of 0.125 – 4.0 cycles deg−1. We used only horizontal gratings at low and medium spatial frequencies to minimise the transverse and longitudinal chromatic aberrations due to ocular optics. At all spatial frequencies studied, chromatic contrast sensitivity increased with grating area. Ac was found to be constant at low spatial frequencies (0.125 – 0.5 cycles deg−1) but decreased in inverse proportion to increasing spatial frequency at 1 – 4 cycles deg−1. Thus, spatial integration depends similarly on spatial frequency for achromatic (Luntinen et al, 1995 Vision Research35 2339 – 2346) and chromatic gratings, and differences in spatial integration do not contribute to the shape difference of the respective contrast sensitivity functions.

scholarly journals Spatio-chromatic contrast sensitivity across the life span: interactions between age and light level in high dynamic range

2020 ◽  
Vol 20 (11) ◽  
pp. 1286
Author(s):  
Maliha Ashraf ◽  
Sophie Wuerger ◽  
Minjung Kim ◽  
Helen Saunderson ◽  
Jasna Martinovic ◽  
...  
Keyword(s):  
Life Span ◽  
Contrast Sensitivity ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Light Level ◽  
Chromatic Contrast ◽  
High Dynamic ◽  
Chromatic Contrast Sensitivity
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