
Contents
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History and definitions History and definitions
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Topological and figural conditions Topological and figural conditions
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Topological condition Topological condition
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Figural conditions Figural conditions
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Transparency in outline patterns Transparency in outline patterns
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Photometric conditions Photometric conditions
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Metelli’s model Metelli’s model
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Reflectances or luminances? Reflectances or luminances?
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Are X-junctions and four regions indispensable? Are X-junctions and four regions indispensable?
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Shadows, transparency, and constancy Shadows, transparency, and constancy
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Effects of transparency Effects of transparency
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Transparency and motion Transparency and motion
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Motion transparency Motion transparency
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Kinetic transparency in grey-level patterns Kinetic transparency in grey-level patterns
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Conclusion Conclusion
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References References
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20 Achromatic transparency
Get accessWalter Gerbino, Department of Life Sciences and B.R.A.I.N. Center for Neuroscience, University of Trieste, Trieste, Italy
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Published:04 August 2014
Cite
Abstract
The chapter illustrates the historical background, the theoretical ideas, and the empirical findings that make achromatic transparency a central phenomenon in perceptual organization research. Perceived transparency is a case of double-belongingness, consistent with the tendency to minimize the complexity of visual organization at the levels of both form and color. Conditions and effects of achromatic transparency are reviewed, in the perspective of percept-percept coupling. Topological, figural, and photometric conditions are described, taking the episcotister as the reference physical model and the availability of X-junctions in a four-region pattern as the typical image information. Achromatic transparency is also discussed in the context of other layering effects (cast shadows, lightness of opaque surfaces, illumination) and in relation to constancy, depth, and motion.
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