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Volume: 28 | Article ID: art00055
Image-Based Measurement of Structural Color using Spectral Camera
  DOI :  10.2352/issn.2169-2629.2020.28.54  Published OnlineNovember 2020

We perceive structural colors by optical phenomena such as light interference and diffraction caused by a fine structure of the object surface. One of the characteristics of structural colors is that a wavelength distribution of light changes depending on an incident angle of a light source and a viewing angle. Generally, for color evaluation and reproduction, it is required to acquire reflection characteristics of objects. Therefore, BRDF (Bidirectional Reflectance Distribution Function) is often used as a function that represents reflection characteristics depending on incident and viewing angles. In this study, we measured BRDF of structural colors based on a method to acquire image-based material reflection characteristics using a spectral camera. The measurement was performed by aligning an optical axis of a spectral camera with a structural color sample and changing an irradiation angle of a light source. Reflection characteristics were represented by using a radiance factor, which was a ratio between a spectral radiance of white material and that of structural color. From measurement results, we confirmed an angle-dependent radiance factor. Finally, based on a measured spectral radiance of a structural color sample, we spectrally reproduced the structural color using a spectral projector based on model fitting of spectral data.

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Kazuki Iwata, Hiroki Shirasawa, Keita Hirai, "Image-Based Measurement of Structural Color using Spectral Camerain Proc. IS&T 28th Color and Imaging Conf.,  2020,  pp 342 - 346,

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Copyright © Society for Imaging Science and Technology 2020
Color and Imaging Conference
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