光学学报, 2008, 28 (11): 2115, 网络出版: 2008-11-17   

反射光偏振特性分析与物体形状的测量

Polarization Analysis on Reflected Light and Three-Dimensional Measurement of Object Shape
作者单位
长春理工大学光电工程学院, 长春 130022
摘要
基于反射光偏振特性, 提出了利用图像处理技术测量透明物体三维形状的理论和方法。分析了物体表面反射光的偏振特性, 表明自然光在经透明物体表面反射后, 反射率随光的振动方向不同而不同, 即反射光表现出部分偏振光的特性。研究了强度反射率与入射角以及光强与偏振片方向之间的函数关系, 得到了光强大小与入射面方向的关系; 根据偏振度概念并结合菲涅耳公式和折射定律, 建立了偏振度和入射角之间的表达式, 可求得物体表面法线方向, 进而得到透明物体的形状。研制了光学实验平台, 获得了物体反射光的偏振图像, 经过图像处理, 获得了被测物体的三维形状。实验结果表明, 这种方法对透明物体形状测量是有效和实用的。
Abstract
A new method was studied for measuring the shape of transparent objects by image processing based on polarization analysis on reflected light from the object surface. Polarization characteristic of reflected light from transparent object surface was studied and it shows that reflectivity varies with direction of reflected light while natural light is reflected via transparent surface object, i.e., the reflection will exhibit characteristic of partly polarized light. The relations of intensity reflectivity and incident angle and intensity and polarizer direction were studied, and the relation between reflectied intensity and incident plane orientation was deduced. The relation of polarization degree of reflected light and incident angle was established based on definition of polarization degree, considering Fresnel equation and reflection law. Thus the surface normal direction can be determined and the shape of transparent object is obtained. Polarization images were taken experimentally and three-dimensional shape of object was reconstructed by image processing. Experimental results show that the proposed method is effective and valid for shape reconstruction of transparent object.

杨进华, 邸旭, 岳春敏, 李志宏, 顾国璋. 反射光偏振特性分析与物体形状的测量[J]. 光学学报, 2008, 28(11): 2115. Yang Jinhua, Di Xu, Yue Chunmin, Li Zhihong, Gu Guozhang. Polarization Analysis on Reflected Light and Three-Dimensional Measurement of Object Shape[J]. Acta Optica Sinica, 2008, 28(11): 2115.

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