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Brightness indention: a novel compression mechanism in the luminance-brightness mapping
1Institute for Perception Research (IPO), Eindhoven, The Netherlands.
Perception & Psychophysics
|October 1, 1995
Summary
Brightness constancy involves luminance compression. New research reveals an additional "brightness indention" mechanism, a brightness decrease around a luminous disk, occurring in large luminance range scenes.
Area of Science:
- Visual perception
- Psychophysics
- Computational neuroscience
Background:
- Brightness constancy implies significant luminance-brightness mapping compression.
- Large luminance ranges may necessitate additional compression mechanisms.
Purpose of the Study:
- Investigate additional brightness compression mechanisms in large luminance range scenes.
- Identify and characterize novel compression phenomena.
Main Methods:
- Experiments involved expanding luminance range using a disk-Ganzfeld configuration.
- Varied disk contrast and size parametrically.
- Conducted sequential dichoptic brightness matches.
Main Results:
- Discovered a novel compression mechanism termed "brightness indention."
- Brightness indention occurs when the surround (Ganzfeld) is less luminous than the disk.
- Observed a brightness decrease in the disk's immediate surroundings.
Conclusions:
- Brightness indention is a previously unreported visual phenomenon.
- This mechanism contributes to brightness perception under large luminance variations.
- Further research is needed to fully understand its implications.
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