Synthesis of material drying history: phenomenon modeling, transferring and rendering
ACM SIGGRAPH 2006 Courses
IEEE Transactions on Visualization and Computer Graphics
Interactive rendering of optical effects in wet hair
Proceedings of the 2007 ACM symposium on Virtual reality software and technology
Digital Modeling of Material Appearance
Digital Modeling of Material Appearance
Synthesis of material drying history: phenomenon modeling, transferring and rendering
NPH'05 Proceedings of the First Eurographics conference on Natural Phenomena
NPH'06 Proceedings of the Second Eurographics conference on Natural Phenomena
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Wet surfaces are ubiquitous in our visual experience. Autonomous machines with vision systems will need to identify wet surfaces from dry. Wet surfaces (especially rough, absorbent ones) appear darker when wet. This paper presents the Lekner and Dorf (1988) model for describing the darkening caused by wetting. We explain how to use this optics model to transform intensity values of a region of an image to make that region appear wet. We also show how the model can be reversed in order to make a wet part of an image appear dry. It is also shown that this technique can be used to identify wet regions. This identification is contrasted with darkening caused by shadows. Comparisons of the gray-level histograms of these real images show the validity of this approach for distinguishing wet surfaces from dry.