Automated three-axis gonioreflectometer for computer graphics applications
Automated three-axis gonioreflectometer for computer graphics applications
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DOI：
10.1117/1.2192787
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发表时间：
2006-04-01
影响因子：
1.3
通讯作者：
Westin, Stephen H.
中科院分区：
文献类型：
--
作者：
Li, Hongsong;Foo, Sing-Choong;Westin, Stephen H.
我们描述了一种自动化三轴测角反射仪，它可以通过提供场景中表面的光散射数据来帮助提高计算机图形渲染的物理真实感。测角反射计可在整个可见光谱以及大部分入射和反射半球上快速测量平坦、各向同性样品表面的双向反射分布函数 (BRDF)。该仪器采用宽带光源和带有衍射光栅和线性二极管阵列的检测器。通过与参考表面和其他仪器进行比较来实现验证。 BRDF 的精度以及光谱和角度范围适合计算机图形图像，同时保留了互易性和能量守恒。报告了在粗糙铝、金属银涂料和光泽黄色涂料上测量的 BRDF，并包含渲染汽车图像的示例。 (c) 2006 年光电仪器工程师协会。
We describe an automated three-axis gonioreflectometer, which can help increase the physical realism of computer graphics renderings by providing light scattering data for the surfaces in a scene. The gonioreflectometer performs rapid measurements of the bidirectional reflectance distribution function (BRDF) for flat, isotropic, sample surfaces over the complete visible spectrum and over most of the incident and reflection hemispheres. The instrument employs a broadband light source and a detector with a diffraction grating and linear diode array. Validation is achieved by comparisons against reference surfaces and other instruments. The accuracy and spectral and angular ranges of the BRDFs are appropriate for computer graphics imagery, while reciprocity and energy conservation are preserved. Measured BRDFs on rough aluminum, metallic silver paint, and a glossy yellow paint are reported, and an example rendered automotive image is included. (c) 2006 Society of Photo-Optical Instrumentation Engineers.