新型线性定标的物体光刀切口长度测量研究

Object Cut Length Measurement Using Light-Knife Based on New Linear Calibration

基于激光三角法原理对三维物体光刀切口长度测量做了深入的研究,着重研究了测量原理和定标方法。采用坐标变换方法,分析了三维物体光刀切口长度测量在高度方向上和光刀方向上的物像关系,得出了三维物体光刀切口长度测量的计算公式。基于高度方向和光刀方向的物像关系提出了一种新型线性定标方法。进行了手指长度测量实验,测量结果精度较高。研究结果表明:高度方向上物体相对高度的倒数和像相对高度的倒数成线性关系;光刀方向上物像的长度比和物体的相对高度成线性关系;新的定标方法精度高,操作方便;光刀测量三维物体切口长度精度高、成本低、处理速度快。

3D object cut length measurement using light-knife is deeply researched based on laser triangulation, and the measurement principle and calibration method are studied in detail. The object-image relationships in height direction and light-knife direction are analyzed through coordinate transformation method, and the calculation formula of 3D object cut length measurement using light-knife is derived. A new linear calibration method is proposed based on the object-image relationships. An experiment of finger＇s length measurement has been done and the results are precise. In the height direction the inverse of object＇s relative height is linear with the that of image＇s relative height. In the light-knife direction the ratio of object＇s length to image＇s length is linear with the object＇s relative height. The new linear calibration method is very precise and simple. The advantages of 3D object cut length measurement using light-knife are of high accuracy, low cost, and high processing speed.