Heightfield and spatially varying BRDF Reconstruction for Materials with Interreflections
Heightfield and spatially varying BRDF Reconstruction for Materials with Interreflections
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DOI：
10.1111/j.1467-8659.2009.01390.x
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发表时间：
2009-04
影响因子：
2.5
通讯作者：
R. Ruiters;R. Klein
中科院分区：
文献类型：
--
作者：
R. Ruiters;R. Klein
从图像中逼真地再现材料外观在从电影到广告到虚拟原型的应用中得到了广泛的应用。一个常见的方法来完成这项任务是重建小规模的几何形状的样品，并捕捉反射率的属性使用空间变化的BRDF。为此，可以使用多视图和光度立体重建，这两种重建方式在视图或光线方向的数量方面都有限制，并且分别会受到低频或高频伪影的影响。在本文中，我们提出了一种新的算法相结合的技术来恢复高度场和空间变化的BRDF，而在同一时间克服上述缺点。我们的主要贡献是一个新的目标函数，它允许重建的高度场和高质量的SVBRDF，包括视图相关的影响。因此，我们的方法也避免了低频和高频伪影。此外，我们的算法考虑了内部反射，允许重建底层材料的未受干扰的表示。在我们的实验中，包括合成和真实的世界的数据，我们表明，我们的方法是上级国家的最先进的方法重建误差以及视觉印象。重建的几何形状和恢复的SVBRDF都是高度精确的，从而忠实地再现了材料的特征外观，这在材料渲染的背景下是至关重要的。
Photo‐realistic reproduction of material appearance from images has widespread use in applications ranging from movies over advertising to virtual prototyping. A common approach to this task is to reconstruct the small scale geometry of the sample and to capture the reflectance properties using spatially varying BRDFs. For this, multi‐view and photometric stereo reconstruction can be used, both of which are limited regarding the amount of either view or light directions and suffer from either low‐ or high‐frequency artifacts, respectively. In this paper, we propose a new algorithm combining both techniques to recover heightfields and spatially varying BRDFs while at the same time overcoming the above mentioned drawbacks. Our main contribution is a novel objective function which allows for the reconstruction of a heightfield and high quality SVBRDF including view dependent effects. Thereby, our method also avoids both low and high frequency artifacts. Additionally, our algorithm takes inter‐reflections into account allowing for the reconstruction of undisturbed representations of the underlying material. In our experiments, including synthetic and real‐world data, we show that our approach is superior to state‐of‐the‐art methods regarding reconstruction error as well as visual impression. Both the reconstructed geometry and the recovered SVBRDF are highly accurate, resulting in a faithful reproduction of the materials characteristic appearance, which is of paramount importance in the context of material rendering.