Measurement System of Bidirectional Reflectance-distribution Function
نویسندگان
چکیده
منابع مشابه
Image-based bidirectional reflectance distribution function measurement.
We present a new image-based process for measuring a surface's bidirectional reflectance rapidly, completely, and accurately. Requiring only two cameras, a light source, and a test sample of known shape, our method generates densely spaced samples covering a large domain of illumination and reflection directions. We verified our measurements both by tests of internal consistency and by comparis...
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To study the optical properties of materials, one needs a complete set of the angular distribution functions of surface scattering from the materials. Here we present a convenient method for collecting a large set of bidirectional reflectance distribution function (BRDF) samples in the hemispherical scattering space. Material samples are wrapped around a right-circular cylinder and irradiated b...
متن کاملInstrument to measure the bidirectional reflectance distribution function of surfaces.
A new instrument to measure the in situ bidirectional reflectance distribution function (BRDF) of surfaces is described. This instrument measures the BRDF for eight illumination angles from 0 to 65 deg, three colors (475, 570, and 658 nm), and at over 100 selected viewing angles. The viewing zenith angles range from 5 to 65 deg, and the azimuth angles, relative to the illumination direction, ra...
متن کاملBidirectional reflectance distribution function of specular surfaces with hemispherical pits.
We derive the bidirectional reflectance distribution function for a class of opaque surfaces that are rough on a macroscale and smooth on a microscale. We model this type of surface as a distribution of spherical mirrors. Since our study concerns geometrical optics, it is only the aperture of the concavities that is relevant, not the dimension. The three-dimensional problem is effectively trans...
متن کاملSpectral and geometrical variation of the bidirectional reflectance distribution function of diffuse reflectance standards.
A study on the variation of the spectral bidirectional reflectance distribution function (BRDF) of four diffuse reflectance standards (matte ceramic, BaSO(4), Spectralon, and white Russian opal glass) is accomplished through this work. Spectral BRDF measurements were carried out and, using principal components analysis, its spectral and geometrical variation respect to a reference geometry was ...
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ژورنال
عنوان ژورنال: Korean Journal of Optics and Photonics
سال: 2010
ISSN: 1225-6285
DOI: 10.3807/kjop.2010.21.2.046