Koichi TAKASE, Norimichi TSUMURA, Toshiya NAKAGUCHI, and Yoichi MIYAKE1
Graduate School of Science and Technology, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
1Research Center for Frontier Medical Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
OPTICAL REVIEW Vol. 15, No. 4 (2008) 187-195
Abstract
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.
Full paper ( to appear )
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