双目视觉风洞测量系统实现的关键技术研究  

Key Issues Research in Realization of Binocular Vision Wind Tunnel Measurement System

作　　者：曹文伦 陈蓓[2] 宋程 贺昱曜[1] CAO Wen-lun;CHEN Bei;SONG Cheng;HE Yu-yao(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China;School of Automation,Northwestern Polytechnical University,Xi’an 710072,China;School of Management,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]西北工业大学航海学院,陕西西安710072 [2]西北工业大学自动化学院,陕西西安710072 [3]合肥工业大学管理学院,安徽合肥230009

出　　处：《计算机技术与发展》2022年第7期128-132,共5页Computer Technology and Development

基　　金：国家自然科学基金资助项目(51377134)。

摘　　要：为了实现高温风洞内防热材料动态烧蚀变形的高精度测量,设计了由主动投射线结构激光、移动高速相机平台和同步控制系统组成的双目同步采集测量软硬件系统。重点研究了对双目视觉测量系统精度和速度影响重大的相机标定、相机同步、图像纹理特征匹配等一系列关键问题。提出了工程上实用的标定方法和准则;基于线结构光主动投射和高速相机,将传统图像幅面特征匹配约束到特征线匹配上来,降低了匹配难度;使用局部搜索改进了传统灰度重心法,不仅加快了线结构光光条中心线的提取速度,同时过滤了部分杂光干扰,提升了图像质量。基于上述方法实现的高速同步触发的双目测量系统目前实现了对常温物体的精确测量,在工况为:待测物距为1200 mm-1500 mm,扫描幅面为200 mm×200 mm,扫描间隔精度为1 mm时,完成一次扫描用时1 s,距离精度为±1 mm,且残差呈正态分布。In order to achieve the high precision measurement of dynamic ablation deformation of heat-resistant materials in high-temperature wind tunnels,a binocular synchronous acquisition and measurement system is designed,which consists of a line structure laser projected actively,a mobile high-speed camera platform,and a synchronous control system.A series of key problems,such as camera calibration,camera synchronization and image texture feature matching,which have great influence on the accuracy and speed of binocular vision measurement system are studied.We propose the practical camera calibration methods and guidelines.Line structured light and ultra-high-speed camera are used to transform image surface feature matching into line matching,which reduces the difficulty of feature match.The use of local search improved the gray centroid method,which not only speeds up locating the center of the light bar,but also filters out the spot interference.The binocular measurement system has achieved accurate measurement of objects at room temperature with the area of 200 mm×200 mm at the distance of 1200 mm~1500 mm in 1 mm scan interval accuracy within 1 second,the distance accuracy is±1 mm.

关 键 词：三维重建 双目视觉 风洞测量 非接触测量 立体视觉 线激光 无损检测 

分 类 号：TP391.8[自动化与计算机技术—计算机应用技术] TM930.9[自动化与计算机技术—计算机科学与技术]