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- W13716421 abstract "Polynomial Texture Mapping (PTM) is a technique employed in a variety of settings, from museums to in-the-field image capture to multi-illuminant microscopy. It consists of illuminating the surface in question with lights from a collection of light directions, each light in turn. To date, the most accurate interpolation employed in PTM consists of two stages: a matte regression stage followed by a further specularity/shadow interpolation. For the first stage, recovering an underlying matte model so as to acquire surface albedo, normals and chromaticity, PTM employs polynomial regression at each pixel, mapping light-direction to luminance. A more accurate model excludes outlier values deriving from specularities and shadows by employing a robust regression from 6-D polynomials to 1-D luminance. Robust methods are guaranteed to automatically find the best representation of the underlying matte content. Here, we retain the idea of using robust methods but instead investigate using a much simpler robust 1-D mode-finder, acting on luminance and on chromaticity components. We then go on to increase accuracy by carrying out 3-D to 1-D regression: this strikes a balance between the best method and the fastest method, with greatly diminished complexity and another large speedup. We show that little accuracy is lost using this much simpler method, and demonstrate the effectiveness of the new method on several image datasets." @default.
- W13716421 created "2016-06-24" @default.
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- W13716421 date "2012-01-01" @default.
- W13716421 modified "2023-10-16" @default.
- W13716421 title "Robust Luminance and Chromaticity for Matte Regression in Polynomial Texture Mapping" @default.
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- W13716421 doi "https://doi.org/10.1007/978-3-642-33868-7_36" @default.
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