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Point Spread Function of Specular Reflection and Gonio-Reflectance Distribution

机译：镜面反射和点反射分布的点扩散函数

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摘要

In this article, the specular reflection phenomenon is analyzed by the concept of the point spread function (PSF). The conventional PSF, which is a sharpness criterion, is used for the transfer function in image science. In general, print (an ink image on paper) is observed as diffuse reflection light, and the light source image, i.e., gloss, is observed as specular reflection. We first introduce the point spread function of specular reflection (SR-PSF). A measurement principle for the SR-PSF is proposed, and a measurement apparatus for the SR-PSF is developed by using a collimator optical system. The experimental results show that the measured SR-PSF works as a transfer function for a specular reflection image. Each detected position is in agreement with the angle of reflected light. The apparatus works as a goniophotometer within a narrow solid angle. The relation between the SR-PSF and the specular reflection angle distribution is discussed in terms of surface geometry. It is concluded that the measured data are the SR-PSF and they have a gonio-reflectance distribution. The reflection angle is caused by the surface normal, and the surface normal distribution can be calculated from the gonio-reflectance distribution by using the mathematical model We plan to apply our proposed principle to the development of an evaluation technique for the visual gloss. In addition, the high-resolution goniophotometer can be further developed by this measuring technique. (C) 2015 Society for Imaging Science and Technology.
机译：在本文中，通过点扩散函数（PSF）的概念分析镜面反射现象。作为清晰度标准的常规PSF用于图像科学中的传递函数。通常，将印刷品（纸上的油墨图像）观察为漫反射光，将光源图像即光泽观察为镜面反射。我们首先介绍镜面反射的点扩散函数（SR-PSF）。提出了用于SR-PSF的测量原理，并且通过使用准直仪光学系统来开发用于SR-PSF的测量设备。实验结果表明，测得的SR-PSF作为镜面反射图像的传递函数。每个检测到的位置与反射光的角度一致。该设备在狭窄的立体角内用作测角光度计。 SR-PSF和镜面反射角分布之间的关系是根据表面几何形状讨论的。结论是测得的数据是SR-PSF，它们具有角反射分布。反射角是由表面法线引起的，并且可以使用数学模型从角反射率分布计算表面法线分布。我们计划将我们提出的原理应用于视觉光泽度评估技术的开发。另外，通过这种测量技术可以进一步开发高分辨率测角光度计。 （C）2015年影像科学与技术学会。

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  • 来源
    《Journal of Imaging Science and Technology》 |2015年第1期|010501.1-010501.10|共10页
  • 作者

    Inoue Shinichi; Tsumura Norimichi;

  • 作者单位

    Mitsubishi Paper Mills Co Ltd, Proc Dev Labs, Nishigomura, Fukushima 9618054, Japan;

    Chiba Univ, Grad Sch Adv Integrat Sci, Inage Ku, Chiba, Chiba 2638522, Japan;

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