Relation between lightness perception and luminance statistics of natural scenes K Kanari, H Kaneko |
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Department of Information Processing, Tokyo Institute of Technology, Japan
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| Results of some studies have shown that the perceived lightness of a stimulus depends on the context of the surroundings in natural scenes. However, few studies strictly divide the effects of context and those of luminance statistics in natural scenes. This study investigated the perceived lightness of a patch presented on a random-dot pattern having no context while manipulating the variance of the pattern luminance. We measured the illuminance and the luminance distribution of actual scenes to examine whether the illumination in our environment is related to some statistics of the luminance distribution of the scenes. Observers matched the perceived lightness of a test patch presented on the random-dot stimulus to that of a comparison patch presented on a uniform gray background by adjusting the comparison patch luminance. Results showed a correlation between the matched luminance and the variance of luminance distribution of the stimulus pattern. Field measurements revealed strong correlation between the variance of the luminance distribution in natural scenes and the illuminance measured in the scene. These results suggest that the visual system might refer some statistics of luminance distribution in an actual environment to estimate the illumination of the scene to produce lightness perception. |
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