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Brightness versus apparent contrast. 2: Large-field asymmetry.

J M du Buf1

  • 1Signal Processing Laboratory, Swiss Federal Institute of Technology, EPFL-Ecublens, Lausanne.

Spatial Vision
|January 1, 1992
PubMed
Summary

This study distinguishes brightness and apparent contrast perception. Luminance increments are more effective for brightness, while decrements become more effective for apparent contrast at higher values.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Photometry

Background:

  • Distinguishing between brightness and apparent contrast is crucial for understanding visual perception.
  • Previous research has explored luminance perception but often conflates brightness and contrast.

Purpose of the Study:

  • To investigate the quasi-static perception of brightness and apparent contrast.
  • To differentiate the perceptual attributes of brightness and apparent contrast.
  • To analyze the effectiveness of luminance increments versus decrements on perception.

Main Methods:

  • Experiments were conducted on a foveal 1-degree disk.
  • Stimuli were presented as luminance increments or decrements against a 300 cd.m-2 background.
  • Data were analyzed using Stevens' power function and standard contrast formulas.

Main Results:

  • Brightness and apparent contrast are distinct perceptual attributes.
  • Luminance increments are more effective than decrements for equal brightness differences.
  • For equal apparent contrast, increments and decrements are similarly effective up to 100 cd.m-2, with decrements becoming more effective at higher values.
  • Both brightness and apparent contrast can be modeled using power functions of luminance differences.

Conclusions:

  • Brightness and apparent contrast are separable perceptual dimensions.
  • The relationship between luminance and perceived attributes is non-linear and depends on whether it's an increment or decrement.
  • Power functions effectively describe the perception of brightness and apparent contrast in relation to luminance differences.

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