Evaluating an image-based bidirectional reflectance distribution function measurement setup

Sole Aditya; Farup Ivar; Nussbaum Peter; Tominaga Shoji

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Evaluating an image-based bidirectional reflectance distribution function measurement setup

机译：评估基于图像的双向反射率分布函数测量设置

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We evaluate an image-based multiangle bidirectional reflectance distribution function measurement setup by comparing it to measurements from two commercially available goniospectrophotometers. The image-based setup uses an RGB camera to perform bidirectional measurements of the sample material. We use a conversion matrix to calculate luminance from the captured data. The matrix is calculated using camera spectral sensitivities that are measured with a monochromator. Radiance factor of the sample material is measured using a commercially available tabletop goniospectrophotometer and compared to measurements made using the image-based setup in the colorimetric domain. Our measurement setup is validated by comparing the measurements performed using a goniospectrophotometer. Uncertainty and error propagation is calculated and taken into account for validation. The sample material measured is wax-based ink printed on packaging paper substrate commonly used in the print and packaging industry. Results obtained show that the image-based setup can perform bidirectional reflectance measurements with a known uncertainty. The goniospectrophotometer measurements lie within the uncertainty of the measurements performed by the image-based measurement setup. The setup can be used to perform bidirectional reflectance measurements on samples with properties similar to the samples used in this paper. (C) 2018 Optical Society of America

机译：通过将其与来自两个商业上可获得的Goniopectophoters的测量值进行比较，我们评估基于图像的多聚双向反射率分布函数测量设置。基于图像的设置使用RGB摄像机进行样品材料的双向测量。我们使用转换矩阵从捕获的数据计算亮度。使用用单色仪测量的相机光谱敏感性来计算矩阵。使用市售的桌面GONIOPTOPTOMER测量样品材料的辐射系数，并与使用比色域中的图像基设置进行的测量相比。通过比较使用GoniopectoPotometer进行的测量来验证我们的测量设置。计算并考虑到验证的不确定性和错误传播。测量的样品材料是印刷在印刷和包装行业的包装纸基材上印有蜡的油墨。得到的结果表明，基于图像的设置可以用已知的不确定性执行双向反射率测量。 GONISPectoPoLometer测量值位于由基于图像的测量设置执行的测量的不确定性内。该设置可用于对具有类似本文所用的样本的样本进行双向反射率测量。（c）2018年光学学会

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《Applied optics》 |2018年第8期|共11页
作者
Sole Aditya; Farup Ivar; Nussbaum Peter; Tominaga Shoji;
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Norwegian Univ Sci &

Technol Fac Informat Technol &

Elect Engn Dept Comp Sci Norwegian Colour &

Visual Comp Lab Gjovik Norway;

Norwegian Univ Sci &

Technol Fac Informat Technol &

Elect Engn Dept Comp Sci Norwegian Colour &

Visual Comp Lab Gjovik Norway;

Norwegian Univ Sci &

Technol Fac Informat Technol &

Elect Engn Dept Comp Sci Norwegian Colour &

Visual Comp Lab Gjovik Norway;

Norwegian Univ Sci &

Technol Fac Informat Technol &

Elect Engn Dept Comp Sci Norwegian Colour &

Visual Comp Lab Gjovik Norway;

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Evaluating an image-based bidirectional reflectance distribution function measurement setup

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