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Adaptive shift of visual sensitivity balance under ambient illuminant change
1Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, Yokohama, Japan. ikuriki@n.cc.titech.ac.jp
Summary
Visual system sensitivity changes nonlinearly with illuminant chromaticity. Chromatic adaptation is less effective under saturated lighting conditions, impacting visual perception.
Area of Science:
- Visual perception
- Color science
- Human visual system
Background:
- The human visual system adapts to different lighting conditions to maintain stable color perception.
- Ambient illuminant chromaticity is a key factor influencing visual sensitivity and adaptation.
Purpose of the Study:
- To investigate the relationship between ambient illuminant chromaticity and visual system sensitivity.
- To quantify the degree of chromatic adaptation under varying illuminant conditions.
Main Methods:
- Measured observer sensitivity in a room with variable-chromaticity illuminants.
- Assessed chromatic adaptation using unique-white settings.
- Conducted experiments with different immediate surrounds to evaluate chromatic induction.
Main Results:
- Visual sensitivity changes nonlinearly with illuminant chromaticity.
- Chromatic adaptation was nearly complete for desaturated illuminants but decreased with increasing saturation.
- Immediate surround color did not significantly affect unique-white settings, indicating illuminant dominance.
Conclusions:
- Ambient illuminant chromaticity is the primary driver of chromatic adaptation changes.
- A new index, relative cone weights, effectively represents the relationship between illuminant and visual sensitivity.