Surface glossiness is a material property that is crucial in helping us to recognize and interact with materials. Estimating surface glossiness from the visual image is a complex and under-constrained problem. This is because image cues to surface glossiness depend not only on the reflectance properties of the surface, but also on object shape, illumination conditions and the observer’s viewpoint. In this thesis, we investigated the effects of illumination, shape and haptics (touch) on gloss perception. First, we showed that observers are not gloss constant under changing illumination conditions and they rely on certain priors about illumination to estimate surface gloss when illumination is unknown. Presenting explicit information about illumination does affect perceived gloss. However, it does not improve gloss constancy. Second, we showed that gloss and shape are estimated jointly rather than independently. A set of image statistics failed to predict observers’ gloss estimates and the interaction between depth and gloss. In this study we also introduced a new method to measure metric estimates of gloss and shape using physical stimuli. Lastly, we introduced haptic shape cues and tested their effects on both perceived gloss and perceived shape. We found that although haptic shape did influence perceived shape, it did not influence visual estimation of gloss. In other words, gloss estimation is not affected by cross-modal shape cues. Together, these findings suggest that visual estimation of gloss is a generative process where gloss is estimated in tandem with other scene properties, ruling out the hypothesis that gloss is estimated directly from a set of image statistics, independently of illumination and shape.
|Advisor:||Landy, Michael S.|
|Commitee:||Adams, Wendy J., Carrasco, Marisa, Maloney, Laurence T., Winawer, Jonathan|
|School:||New York University|
|School Location:||United States -- New York|
|Source:||DAI-B 78/08(E), Dissertation Abstracts International|
|Subjects:||Behavioral psychology, Experimental psychology, Cognitive psychology|
|Keywords:||Gloss, Haptic perception, Illumination, Material perception, Physical scaling, Three-dimensional shape|
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