High-dynamic-range camera-based bidirectional reflectance distribution function measurement system for isotropic materials
High-dynamic-range camera-based bidirectional reflectance distribution function measurement system for isotropic materials
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基于高动态范围相机的各向同性材料双向反射率分布函数测量系统
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. Lee
中科院分区：
文献类型：
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作者：
D. Kim;K. Park;K. Kim;M. Seo;K. Lee
提出了一种基于高动态范围（HDR）相机的双向反射率分布函数（BRDF）测量系统，该系统可以测量各向同性材料的反射率特性。我们开发的系统可以比以前的系统更快地测量高镜面材料的BRDF。它测量高密度BRDF样本，具有更宽的反射角和更少的噪声，因此它提供了计算机图形应用所必需的精度。为了估计给定材料的反射率，我们对HDR相机进行了绝对光度校准。通过检测亥姆霍兹互易性，并与以往基于图像的系统进行性能比较，验证了系统的有效性。通过对四种不同各向同性材料的实测数据进行测量拟合和直接绘制生成的图像进行比较，证明了所开发系统的能力和效率。
We present a novel high-dynamic-range (HDR) camera-based bidirectional reflectance distribution function (BRDF) measurement system that can measure the reflectance property of isotropic materials. Our developed system can measure the BRDF of highly specular materials much faster than previous systems. It measures highly dense BRDF samples for a wider reflection angle with less noise so that it provides accuracy that is necessary for computer graphics application. To estimate the reflectance of a given material, we perform an absolute photometric calibration for the HDR camera. Our system is verified by checking the Helmholtz reciprocity and comparing the performance with that of previous image-based systems. The capability and efficiency of the developed system is demonstrated by comparing the images generated by measure-and-fit and direct-rendering methods using the measured data of four different isotropic materials.