Normative values for a tablet computer-based application to assess 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.

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Chromatic Contrast Sensitivity

Encyclopedia of Color Science and Technology ◽

10.1007/978-1-4419-8071-7_17 ◽

2016 ◽

pp. 108-114

Author(s):

Christoph Witzel ◽

Karl Gegenfurtner

Keyword(s):

Contrast Sensitivity ◽

Chromatic Contrast ◽

Chromatic Contrast Sensitivity

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Measurements of achromatic and chromatic contrast sensitivity functions for an extended range of adaptation luminance

10.1117/12.2002178 ◽

2013 ◽

Cited By ~ 12

Author(s):

Kil Joong Kim ◽

Rafal Mantiuk ◽

Kyoung Ho Lee

Keyword(s):

Contrast Sensitivity ◽

Chromatic Contrast ◽

Sensitivity Functions ◽

Extended Range ◽

Chromatic Contrast Sensitivity

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

Journal of Vision ◽

10.1167/jov.20.11.1286 ◽

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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Are Spatial Chromatic Contrast Sensitivity Band-pass or Lowpass Functions?

Color and Imaging Conference ◽

10.2352/issn.2169-2629.2020.28.19 ◽

2020 ◽

Vol 2020 (28) ◽

pp. 125-129

Author(s):

Qiang Xu ◽

Stephen Westland ◽

Marcel Lucassen ◽

Dragan Sekulovski ◽

Sophie Wuerger ◽

...

Keyword(s):

Contrast Sensitivity ◽

Threshold Method ◽

Colour Difference ◽

Chromatic Contrast ◽

Experimental Conditions ◽

Colour Centres ◽

Spatial Frequencies ◽

Wide Range ◽

Band Pass ◽

Chromatic Contrast Sensitivity

The goal of this research is to generate high quality chromatic Contrast Sensitivity Function (CSF) over a wide range of spatial frequencies from 0.06 to 3.84 cycles per degree (cpd) surrounding 5 CIE proposed colour centres (white, red, yellow, green and blue) to study colour difference. At each centre, 6 colour directions at each of 7 frequencies were sampled, from 0.06 to 3.84 cycles per degree (cpd) corresponding to the number of cycles: from 2.3 to 144.4 respectively. A threshold method based on forced-choice stair-case was adopted to investigate the just noticeable (threshold) colour difference. The results revealed that the chromatic CSF under the present experimental conditions having many lower spatial frequencies covering five colour centres to be band pass, whereas previous results indicated it was low pass. However, this could be caused by the present experimental conditions such as fixed-size stimuli and constant luminance. The new chromatic CSF for R-G and Y-B channels were also developed.

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