物体の拡散反射光成分による輝度分布の推定と形状計測について : 実験による検討

概要

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Photometric stereo method can be used to find the orientation of the surface of an object to be measured. This method cannot avoid the influence of highlights in an image that are caused by the specular reflection components of mixed diffuse-specular objects. In a previous paper, we presented that estimate luminance distribution in highlight regions can eliminate influence of highlights in an image. However, the previous method is unstable when some highlight regions overlap. We have proposed a new method of measuring the shapes of mixed diffuse-specular objects. First, highlight is detected using the bi-directional reflectance distribution function. Next, highlight regions that overlap in a gray-level image are divided using the watershed algorithm. Then, the luminance distribution caused by the diffuse reflection components in the highlight regions is estimated based on the luminance distribution in a gray-level image without highlights. Shape measurement experiments using mixed diffuse-specular objects with different characteristic reflectances and shapes showed that our method can accurately measure the 3-D shape of mixed diffuse-specular objects.
社団法人照明学会の論文
2005-08-01