具有邻近平面分布光源的光度立体

James J. Clark
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引用次数: 19

摘要

本文研究了利用邻近平面分布光源进行形状渐变的问题。结果表明,一个矩形平面附近分布的均匀各向同性光源照射在一个小的朗伯曲面斑块上,在无穷远处相当于一个单一的各向同性点光源。给出了等效点光源方向在光源角位置上的封闭解。等效点光源可以获得多个矩形光源,允许使用标准的光度立体算法。对具有任意亮度分布的矩形平面光源进行了推广。结果表明,用Walsh函数逼近任意光源分布可以有效地计算等效点光源方向。针对深度未知的情况,提出了一种采用解一致性度量的搜索技术。本文中提出的理论的应用包括使用形状-从阴影算法的视觉用户界面,利用来自计算机显示器或电影屏幕的照明。
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Photometric Stereo with Nearby Planar Distributed Illuminants
This paper considers the problem of shape-from-shading using nearby planar distributed illuminants. It is shown that a rectangular planar nearby distributed uniform isotropic illuminant shining on a small Lambertian surface patch is equivalent to a single isotropic point light source at infinity. A closed-form solution is given for the equivalent point light source direction in terms of the illuminant corner locations. Equivalent point light sources can be obtained for multiple rectangular illuminants allowing standard photometric stereo algorithms to be used. An extension is given to the case of a rectangular planar illuminant with arbitrary radiance distribution. It is shown that a Walsh function approximation to the arbitrary illuminant distribution leads to an efficient computation of the equivalent point light source directions. A search technique employing a solution consistency measure is presented to handle the case of unknown depths. Applications of the theory presented in this paper include visual user-interfaces using shape-from-shading algorithms making use of the illumination from computer monitors, or movie screens.
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