摘要
在小工件的三维测量任务中,传统的接触式测量方法测量速度慢、效率低。非接触式测量方法能够实现快速测量,提高测量效率。然而目前的非接触式测量设备便携性差且价格昂贵。鉴于此,基于线结构光视觉测量原理,设计了一套单目便携式测量系统,利用一个CCD摄像头和一个线激光投射器组成测量系统。在被测工件下面放置一个网格平面靶标,通过霍夫变换提取网格线,对网格线进行排序与求交点获得带标签的网格点,使用带标签的网格点计算出相机坐标系到网格坐标系的转换矩阵以实现点云拼接,从而得到被测工件表面的完整点云数据。实验表明,该方法能够实现小工件的快速非接触式三维测量,测量误差在1 mm以内。
In the measurement task of small workpiece,the traditional contact measurement method is slow and inefficient.Non-contact measurement method can achieve fast measurement and improve measurement efficiency.However,current non-contact measurement equipment is poorly portable and expensive.In view of this,based on the principle of line structured light vision measurement,a monocular portable measurement system is designed.The measurement system is constructed using a CCD camera and a line laser projector.Place a grid plane target under the workpiece to be measured,and extract the grid lines by Hough transform,the grid points with labels are obtained by sorting and finding the intersection of the grid lines,and the transformation matrix of the camera coordinate system to the grid coordinate system is calculated by the grid points with labels to splice point cloud,and the point cloud data of workpiece’s surface are obtained.Experiments show that the method can realize fast non-contact three-dimensional measurement of small workpiece,and the measurement error is less than 1 mm.
作者
闫光绪
贺赛先
Yan Guangxu;He Saixian(School of Electronic Information.Wuhan University,Wuhan,Hubei 430079,China)
出处
《应用激光》
CSCD
北大核心
2020年第2期315-322,共8页
Applied Laser
基金
国家测绘地理信息局项目(项目编号:201412015)。
关键词
激光扫描
系统标定
光条提取
网格靶标
点云拼接
laser scanning
system calibration
strip extraction
grid target
point cloud splicing
