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VITRAIL: Acquisition, Modeling, and Rendering of Stained Glass

机译:VITRAIL:彩色玻璃的采集,建模和渲染

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Stained glass windows are designed to reveal their powerful artistry under diverse and time-varying lighting conditions; virtual relighting of stained glass, therefore, represents an exceptional tool for the appreciation of this age old art form. However, as opposed to most other artifacts, stained glass windows are extremely difficult if not impossible to analyze using controlled illumination because of their size and position. In this paper, we present novel methods built upon image based priors to perform virtual relighting of stained glass artwork by acquiring the actual light transport properties of a given artifact. In a preprocessing step, we build a material-dependent dictionary for light transport by studying the scattering properties of glass samples in a laboratory setup. We can now use the dictionary to recover a light transport matrix in two ways: under controlled illuminations the dictionary constitutes a sparsifying basis for a compressive sensing acquisition, while in the case of uncontrolled illuminations the dictionary is used to perform sparse regularization. The proposed basis preserves volume impurities and we show that the retrieved light transport matrix is heterogeneous, as in the case of real world objects. We present the rendering results of several stained glass artifacts, including the Rose Window of the Cathedral of Lausanne, digitized using the presented methods.
机译:彩色玻璃窗的设计旨在在多种多样且随时间变化的照明条件下展现其强大的艺术气息。因此,对彩色玻璃的虚拟重新照明代表了一种欣赏这种古老艺术形式的绝佳工具。但是,与大多数其他伪像相反,彩色玻璃窗由于尺寸和位置的原因,即使不是不可能使用受控照明进行分析,也极其困难。在本文中,我们提出了一种基于图像的先验方法,该方法通过获取给定工件的实际光传输特性来对彩色玻璃艺术品进行虚拟重照明。在预处理步骤中,我们通过研究实验室设置中玻璃样品的散射特性,建立了光传输的材料相关字典。现在,我们可以使用字典以两种方式恢复光传输矩阵:在受控照明下,字典构成压缩感知采集的稀疏基础,而在不受控制的照明情况下,字典用于执行稀疏正则化。所提出的基础保留了体积杂质,并且我们证明了检索到的光传输矩阵是异质的,就像在现实世界中的物体一样。我们介绍了几种彩色玻璃假象的渲染结果,包括使用提出的方法进行数字化处理的洛桑大教堂的玫瑰窗。

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