Acquisition and Validation of Spectral Ground Truth Data for Predictive Rendering of Rough Surfaces
Acquisition and Validation of Spectral Ground Truth Data for Predictive Rendering of Rough Surfaces
复制标题
用于粗糙表面预测渲染的光谱地面实况数据的采集和验证
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Arnulph Fuhrmann
中科院分区：
文献类型：
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作者：
Olaf Clausen;R. Marroquim;Arnulph Fuhrmann
基于物理的渲染使用物理原理来模拟光与物质的相互作用。即使有可能实现逼真的渲染，它往往无法预测。有两个主要问题：首先，没有分析材料模型考虑所有的外观关键特性；其次，光在许多情况下只能用3个RGB样品来描述。这就导致了对不同的材料类型有不同的模型的问题，并且波长相关的现象只是近似的。为了能够分析这两个问题对现实世界材料外观的影响，有必要对渲染和现实进行准确的比较。因此，在这项工作中，我们获得了一组精确和光谱分辨的地面真值数据。它包括对新开发的参考场景的精确描述，包括24个色块的各向同性brdf，以及参考场景内13个不同角度下所有色块的参考测量。我们的参考数据涵盖了具有许多不同光谱分布和各种照明情况的粗糙材料，从直接光到间接光主导的情况。
Physically based rendering uses principles of physics to model the interaction of light with matter. Even though it is possible to achieve photorealistic renderings, it often fails to be predictive. There are two major issues: first, there is no analytic material model that considers all appearance critical characteristics; second, light is in many cases described by only 3 RGB‐samples. This leads to the problem that there are different models for different material types and that wavelength dependent phenomena are only approximated. In order to be able to analyze the influence of both problems on the appearance of real world materials, an accurate comparison between rendering and reality is necessary. Therefore, in this work, we acquired a set of precisely and spectrally resolved ground truth data. It consists of the precise description of a new developed reference scene including isotropic BRDFs of 24 color patches, as well as the reference measurements of all patches under 13 different angles inside the reference scene. Our reference data covers rough materials with many different spectral distributions and various illumination situations, from direct light to indirect light dominated situations.