Measurement of bidirectional reflectance distribution function with a linear light source

被引:7
作者
Takase, Koichi [1 ]
Tsumura, Norimichi [1 ]
Nakaguchi, Toshiya [1 ]
Miyake, Yoichi [2 ]
机构
[1] Chiba Univ, Grad Sch Sci & Technol, Inage Ku, Chiba 2638522, Japan
[2] Chiba Univ, Res Ctr Frontier Med Engn, Inage Ku, Chiba 2638522, Japan
基金
日本学术振兴会;
关键词
BRDF; reflectance function; linear light source; light field; Gonio-photometric; rendering;
D O I
10.1007/s10043-008-0030-z
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
This paper proposes a practical measurement system for bidirectional reflectance distribution functions (BRDFs) of a three-dimensional (3D) object with a linear light source. Using the linear light source, the proposed system can reduce the number of image acquisitions which are necessary for an estimation of the spatially-varying BRDFs of the object. Furthermore, the size of the proposed system is much smaller than a conventional system which uses a parallel light. In this proposed system, the light field of the linear light source is previously measured to determine direction and radiance of incident rays to each point of the object, because the direction and radiance are not constant at each point. Using the proposed system, the BRDF of a point of flat objects was experimentally measured, and results showed validation of the estimation accuracy of the proposed system. Measurement efficiency of the proposed system was also evaluated by comparing reflectance model parameters estimated by the conventional and proposed systems. For the estimation, the reflectance function of a 3D object was measured by both systems. The estimation accuracy of the proposed method was also evaluated by comparing among a real image and rendered 3D objects of the conventional and proposed methods. (c) 2008 The Optical Society of Japan.
引用
收藏
页码:187 / 195
页数:9
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