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A transducer model for contrast perception
1H. G. Armstrong Aerospace Medical Research Laboratory, AAMRL/HEF Wright-Patterson Air Force Base, OH 45433-6573.
Vision Research
|January 1, 1991
Summary
This study introduces a new model for visual function that simulates contrast detection and perception. It addresses the transition from detection to perception by modeling the gradual loss of spatial response pooling with increasing contrast.
Area of Science:
- Visual neuroscience
- Computational vision
- Psychophysics
Background:
- Existing visual function models are limited to either threshold or suprathreshold conditions.
- The transition phase between contrast detection and perception, involving spatial response pooling, remains poorly understood.
Purpose of the Study:
- To propose a novel computational model for visual function.
- To simulate contrast detection, contrast perception, and the dynamic changes in spatial response pooling across varying contrast levels.
Main Methods:
- Development of a new multi-channel visual model.
- Simulation of responses to multiple component stimuli at different contrast levels.
Main Results:
- The proposed model successfully simulates contrast detection and perception.
- The model accurately predicts thresholds and perceived contrast functions for complex stimuli.
- It captures the gradual disappearance of spatial response pooling as contrast increases.
Conclusions:
- The new model provides a unified framework for understanding visual function across detection and perception.
- It offers a mechanism to explain the shift in spatial processing with contrast intensity.
- This model advances the simulation of visual responses to multi-component stimuli.