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首页> 外文期刊>ACM Transactions on Graphics >Acquisition and Analysis of Bispectral Bidirectional Reflectance and Reradiation Distribution Functions
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Acquisition and Analysis of Bispectral Bidirectional Reflectance and Reradiation Distribution Functions

机译：双光谱双向反射和辐射分布函数的获取和分析

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摘要

In fluorescent materials, light from a certain band of incident wavelengthsrnis reradiated at longer wavelengths, i.e., with a reducedrnper-photon energy. While fluorescent materials are common in everydayrnlife, they have received little attention in computer graphics.rnEspecially, no bidirectional reradiation measurements of fluorescentrnmaterials have been available so far. In this paper, wernextend the well-known concept of the bidirectional reflectance distributionrnfunction (BRDF) to account for energy transfer betweenrnwavelengths, resulting in a Bispectral Bidirectional Reflectancernand Reradiation Distribution Function (bispectral BRRDF). Usingrna bidirectional and bispectral measurement setup, we acquire reflectancernand reradiation data of a variety of fluorescent materials,rnincluding vehicle paints, paper and fabric, and compare their renderingsrnwith RGB, RGB×RGB, and spectral BRDFs. Our acquisitionrnis guided by a principal component analysis on complete bispectralrndata taken under a sparse set of angles. We show that in order tornfaithfully reproduce the full bispectral information for all other angles,rnonly a very small number of wavelength pairs needs to bernmeasured at a high angular resolution.
机译：在荧光材料中，来自一定入射波长带的光以更长的波长，即以降低的全光子能量进行辐射。尽管荧光材料在日常生活中很常见，但在计算机图形学中却很少受到关注。特别是，到目前为止，荧光材料的双向辐射测量尚不可用。在本文中，我们扩展了双向反射率分布函数（BRDF）的众所周知的概念，以解决波长之间的能量转移，从而产生了双光谱双向反射率和辐射分布函数（bispectral BRRDF）。使用双向和双光谱测量设置，我们获取各种荧光材料（包括车漆，纸张和织物）的反射率和再辐射数据，并将它们的渲染图与RGB，RGB×RGB和光谱BRDF进行比较。我们的采集器以在稀疏角度下获取的完整双光谱数据的主成分分析为指导。我们显示，为了忠实地再现所有其他角度的完整双光谱信息，仅需要以高角度分辨率测量非常少的波长对。

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