关于线结构光视觉技术的微小直径高精度测量系统.pdfVIP

第 35 卷 第 12 期增刊 仪 器 仪 表 学 报 Vol.35 No.12 2014 年 12 月 Chinese Journal of Scientific Instrument Dec. 2014 基于线结构光视觉技术的微小直径 高精度测量系统* 刘 斌， 沈 康，魏兆超，贾艳慧，张宝峰 （1.天津市复杂工业系统控制理论及应用重点实验室 天津理工大学 天津 300384 2.天津理工大学自动化学院 天津 300384 ） 摘 要：本文研制了基于线结构光的微小直径高精度测量系统，用于微小圆柱物体直径的测量。针对线结构光传感器应用于 微小三维尺寸测量的特点，研究建立了适用的DLT改进数学模型，包含线性变换参数和畸变修正参数；研究设计了系统标定 方法和流程，采用迭代标定运算过程，保证了系统标定参数的准确可靠；采用了自主研究的椭圆光条径向灰度重心提取方法 进行图像处理，能够准确地获取椭圆光条中心的像素坐标；对系统进行了标定和重复性测量实验，实验结果表明系统的测量 精度可达±1.6μm。 关键词：线结构光；微小直径；DLT改进数学模型；标定流程 High-precision measurement system for micro-diameter based on structured-light vision technology Liu Bin , Shen Kang , Wei Zhaochao , Jia Yanhui, Zhang Baofeng (1 Tianjin Key Laboratory of Control Theory Applications in Complicated System, Tianjin University of Technology, Tianjin 300384, China;2 School of Electrical Engineering, Tianjin University of Technology, Tianjin 300384, China) Abstract ：Based on structured-light vision measurement technology, a measuring system for diameter of micro cylinder is established. Based on structured-light vision sensor, the measurement principle and mathematical model are described as the improved DLT mathematical model for 3D micro size measurement, including linear transformation parameters and distortion correction parameters. And the corresponding calibration algorithm process has been studied. The grayscale barycenter extraction algorithm along the radial direction has been applied in the system, which can precisely gather the image coordinates of the ellipse-shaped light-stripe centers. The calibration and measurement repeatability