一种用于计算三维视觉测量中线结构光平面的新型算法

介绍了一种基于线结构光的机器视觉测量系统的光平面计算方法.该方法采用图像减影来获取光条图像,利用Steger算法提取图像中的亚像素光条中心点,再用正交直线拟合法计算图像坐标系下的光条直线方程.通过靶标特征点的世界坐标和交比不变性,计算线结构光在靶标平面上的世界坐标点,并将这些坐标点用正交平面拟合法计算得到光平面方程.为了提高整体准确度,本文对算法进行了细节优化,给出了标定系统的设计方案和实验过程.实验结果表明,该方法具有较好的鲁棒性和较高的准确度.

A Novel Algorithm for Computing the Plane of Line Structured Light in 3D Vision Measurement

A novel algorithm is presented to compute the plane equation of line structured light, which used in a machine vision measurement system. Image subtraction is introduced to obtain stripe image, Steger algorithm is applied to extract sub-pixel level centric points of stripe in the image, and orthogonal line fitting is performed to gain line equation of stripe in image coordinate system. The approach of calculating world coordinates of points on the plane of line structured light from feature points in calibration board is introduced, which are based on the principle of cross-ratio invariance. Finally, orthogonal least-squares plane is proposed fitting to get light plane equation. Some specific optimizations in algorithm are put forward to improve total accuracy, and the scheme design of calibration system and detailed experimental procedure are given. Experimental results demonstrate that the method is of robustness and has high accuracy.