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  On the Visual Perception of Translucent Materials

Fleming, R. (2005). On the Visual Perception of Translucent Materials. Poster presented at 8th Tübinger Wahrnehmungskonferenz (TWK 2005), Tübingen, Germany.

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 Creators:
Fleming, R1, 2, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Many commonly occurring substances are somewhat translucent (e.g. wax, jade, fruit-flesh, and cheese). When light strikes a translucent material, it passes through the surface and scatters a number of times within the body of the object before re-emerging. This causes light to ‘bleed’ through translucent objects, giving them a distinctive visual softness and glow. What image cues are responsible for this characteristic appearance? How do we distinguish between translucent and opaque materials? Here we use a combination of image statistics and psychophysics to study the perception of translucent materials. There has been a large amount of previous work on the perception of materials that transmit light. Almost all of this work is based on simple physical models of transparency, (e.g. the episcotister model of Metelli, 1974), in which the object of interest is a thin filter or screen. However, recent advances in computer graphics (Jensen et al. 2001; Jensen and Buhler, 2002) make it possible to simulate the complex physics of solid translucent objects. We have used this model to study how a wide range of factors influence the perception of translucency, including highlights, colour, contrast, brightness, blurriness, and conditions of illumination. Our main findings are as follows: (1) We have found that it is possible to enjoy a vivid impression of translucency even when many of the cues that were traditionally believed to be important for the perception of transparency (e.g. X-Junctions, contrast conditions) are absent from the display. (2) We argue that sub-surface light scattering is too complex for the visual system to infer translucency by inverse optics. Accordingly we suggest that the visual system tracks low-level image statistics that reliably correlate with changes in translucency. (3)We find that perceived translucency varies dramatically with conditions of illumination. We compare how well a number of candidate cues can predict these variations. In conclusion, there is a wide range of materials that have not been studied before, and which we are only just beginning to understand. Many intuitions that we have about which cues are crucial for recovering opacity turn out to be at best incomplete.

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 Dates: 2005-02
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: BibTex Citekey: Fleming2005
 Degree: -

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Title: 8th Tübinger Wahrnehmungskonferenz (TWK 2005)
Place of Event: Tübingen, Germany
Start-/End Date: 2005-02-25 - 2005-02-27

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Title: 8th Tübingen Perception Conference: TWK 2005
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Mallot, HA, Editor            
Ulrich, R, Editor
Wichmann, FA1, Editor            
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 89 Identifier: ISBN: 3-927091-70-7