传送带物体线结构光三维扫描成像系统的位移标定方法研究

Research on displacement calibration method of 3d scanning imaging system with linear structured light for conveyor belt

在对传送带上物体进行三维扫描成像过程中,位移标定方法的便捷性、准确性对于最终的成像精度和效率有非常重要的影响,但传统的位移标定方法需要已知位移平台或者传送带的运动速度或严格控制两次标定图片中标定板之间的精确位移,使得标定过程较为复杂。论文提出了一种专门用于传送带上物体测量的线结构光三维扫描成像系统的位移标定方法。只需要采集一系列标定板随传送带移动的位移标定图片,从中提取两张帧数间隔大于1的图片并记录对应的帧数,即可对单帧位移进行标定。介绍了该标定方法的基本原理和实现方法,搭建了线扫描单目成像系统,并对双阶梯型精度块进行了三维重建。实验结果表明,方法原理简单,操作便捷,测量速度更快且重建误差小于0.3mm,适用于以传送带作为主要运输工具的各个领域的实时三维测量。

In the process of three-dimensional scanning and imaging of objects on the conveyor belt,the convenience and accuracy of the displacement calibration method have a very important impact on the final imaging accuracy and efficiency,but the traditional displacement calibration method requires knowing the movement speed of the displacement platform and conveyor belt or strictly controlling the precise displacement between the calibration plates in the two calibration pictures,which makes the calibration process more complicated.A displacement calibration method of linear structured light 3D scanning and imaging system specially used for object measurement on conveyor belts is proposed.This calibration method only needs to collect a series of displacement calibration pictures of the calibration plate moving with the conveyor belt,extract two pictures with a frame interval greater than 1 and record the corresponding number of frames to calibrate the single frame displacement.The basic principle and implementation method of the calibration method are introduced,the line scan monocular imaging system is built,and the double-step precision block is reconstructed in three dimensions.The experimental results show that the method is simple in principle,convenient in operation,faster in measurement speed and simple in operation,and the reconstruction error is less than O.3mm.It is suitable for real-time three-dimensional measurement in various fields where the conveyor belt is the main means of transportation.