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Noncontact optical measurement system of three-dimensional shapes of objects with various kinds of surface reflectance

各种表面反射率物体三维形状的非接触式光学测量系统

基本信息

批准号：
12650428
负责人：
BABA Mitsuru
金额：
$ 2.3万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

In this research, we have developed a new triangulation-based laser rangefinder for measuring the 3-D shapes of objects with hybrid reflectance, which combines Lambertian reflectance and specular reflectance. Ordinary laser rangefinding techniques at present have rarely been applied to the measurement of the shapes of this type of object, since the equations for the computation of 3-D position based on tnangulation do not hold for objects with specular reflectance.Like the ordinary rangefinder, the proposed rangefinder consists of a light-stripe generator, a lens system, and an image sensor. The lens system hes at the core of the scheme of our rangefinder. It consists of a field stop, a lens, and shield masks. The field stop is placed in front of the lens and parallel to the lens, and has horizontal slits. The shield masks are located between the lens and the image sensor, and composed of multiple thin plates which stand vertically at a constant angle with respect to the lens.We measured shape measurements of object with hybrid surfacesThe experimental results demonstrate that the proposed rangefinder allows the measurement of hybrid objects with almost the same level of accuracy as that of Lambertian object, and specular objects Since the rangefinder does not require a reflectance model of the object's surface, it has the advantages of higher accuracy and reliability over other shape extraction techniques for Lambertian surfaces and/or specular surfaces. The proposed rangefinder is especially available for industrial purposes since a consistent accuracy and high reliability are assured even for objects with unknown reflectance properties. In conclusion the rangefinder is promising for many common industrial tasks including measurement of the shapes of metal objects and the inspection of solder joint surfaces.

在这项研究中，我们已经开发了一种新的基于三角测量的激光测距仪，用于测量物体的三维形状与混合反射，它结合了朗伯反射和镜面反射。目前，普通的激光测距技术很少应用于这类物体的形状测量，因为对于镜面反射的物体，基于平移的三维位置计算公式不成立。透镜系统是我们测距仪设计的核心。它由视场光阑、透镜和屏蔽罩组成。场光阑被放置在透镜的前面并且平行于透镜，并且具有水平狭缝。该测距仪由多个与透镜成一定角度的薄板组成，位于透镜和图像传感器之间。我们对具有混合表面的物体进行了测量。实验结果表明，该测距仪可以对混合物体进行测量，其精度几乎达到朗伯物体的测量精度。和镜面物体由于测距仪不需要物体表面的反射率模型，因此其具有优于用于朗伯表面和/或镜面的其他形状提取技术的更高精度和可靠性的优点。建议的测距仪是特别适用于工业目的，因为一致的精度和高可靠性，即使是未知的反射特性的对象有保证。总之，测距仪适用于许多常见的工业任务，包括测量金属物体的形状和检查焊点表面。