The directional emissivity is deduced from the Bidirectional Reflectance Distribution Function (BRDF) in the hemispherical scattering space of the objects.
利用双向反射分布函数测量系统，通过对物体表面双向反射分布的测量来获得其方向发射率。
The concept and measuring method of BRDF (Bi-directional Reflectance Distribution Function) are discussed in the paper.
本文介绍了双向反射分布函数(BRDF)的概念和测量方法。
In order to get an ideal lane marks' edge, an image preprocessing method based on edge distribution function (EDF) was proposed considering the directional characteristics of lane marks.
为了得到较理想的车道标识线的边缘，考虑车道标识线的方向特性，提出一种基于边缘分布函数(EDF)的图像预处理方法。
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