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On-line Simultaneous Measurement of Three Dimensional Shape and Glossiness with Specular Objects

镜面物体三维形状和光泽度的在线同步测量

基本信息

批准号：
10650411
负责人：
BABA Mitsuru
金额：
$ 2.24万
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：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650411/
关键词：
Three dimensional shape measurement Glossiness measurement Specular objects On-line measurement

项目摘要

Many practical tasks in industry often require the determination of the three-dimensional (3-D) shapes of objects with specular surfaces, such as polished metal parts, soldered joints or welded areas. Although several methods exist for the determination of such information, these methods have been only partially succeeded in determining of shape information due to the following two limitations :(1) These methods have generally assumed the objects' reflectance properties to be exclusively Lambertian or specular.(2) The accuracy of shape measurement has strongly deepened on the accuracy of image intensity measurement.In 1998, we have proposed a new laser rangefinder for measuring the 3-D shapes of specular objects. The basic concept of the proposed rangefinder is to limit the incident angle of a light-strip upon the image sensor to a constant angle using shield masks, resulting in the ability to apply a triangulation system to the measurement of specular objects. And, we derived the equations to determine an objects' 3-D positions by triangulation and applied them to the rangefinder.In 1999, we designed and built a prototype rangefinder, which fulfils the requirements of our original idea. Experiments using the rangefinder successfully achieve accurate measurements using light-stripe projection. The rangefinder is promising for many common industrial tasks including measurement of the shapes of polished metal objects and the inspection of solder joint surface. Important factors limiting the rangefinder's practical applications are its field of view, depth of field and speed when applied to specular objects.

工业中的许多实际任务通常需要确定具有镜面表面的物体的三维（3-D）形状，例如抛光的金属部件、焊接接头或焊接区域。尽管存在用于确定这种信息的若干方法，但是由于以下两个限制，这些方法在确定形状信息方面仅部分成功：（1）这些方法通常假设对象的反射特性是唯一的朗伯或镜面反射。(2)形状测量的精度大大加深了对图像强度测量的精度。1998年，我们提出了一种新的激光测距仪，用于测量镜面物体的三维形状。所提出的测距仪的基本概念是使用屏蔽掩模将光条在图像传感器上的入射角限制为恒定角度，从而能够将三角测量系统应用于镜面物体的测量。在1999年，我们设计并制造了一台测距仪样机，实现了我们最初的设想。使用测距仪的实验成功地实现了精确的测量，使用光条投影。测距仪适用于许多常见的工业任务，包括测量抛光金属物体的形状和检查焊点表面。限制测距仪实际应用的重要因素是它的视野、景深和应用于镜面物体时的速度。