基于双目立体视觉的连铸辊尺寸三维测量方法

3D measurement method for continuous casting roll size based on binocular stereo vision

针对连铸车间中,扇形段连铸辊尺寸人工测量效率低下的问题,提出了一种基于双目视觉系统的连铸辊尺寸测量方法。首先,对双目相机采集的图像进行预处理并采用Otsu法分割工件前后背景;接着,针对边缘检测精度不高的问题,将传统Canny边缘检测算法的梯度模板增加到8个以提取工件轮廓,结合多项式插值公式提取亚像素级别特征点;然后,在SAD与Census变换融合的立体匹配基础上引入RANSAC算法来消除错误匹配;最后,采用三角测量原理计算出零件的尺寸。实验结果表明,系统测量的平均相对误差为0.14%,测量方法具有较高的精度,其稳定性与精确性满足连铸辊的尺寸自动检测任务。

Aiming at the problem of low manual measurement of the size of continuous casting rolls in the sector section in the continuous casting workshop,a continuous casting roll size measurement method based on binocular vision system is proposed.Firstly,the images collected by the binocular camera are preprocessed and the Otsu method was used to segment the background before and after the workpiece;And then,in view of the problem of low edge detection accuracy,the gradient templates of the traditional Canny edge detection algorithm are increased to 8 to extract the workpiece contour,and the sub-pixel level feature points are extracted by combining the polynomial interpolation formula.Then,based on the stereo matching of SAD and Census transformation fusion,the RANSAC algorithm was introduced to eliminate false matching.Finally,the triangulation principle is used to calculate the dimensions of the part.The experimental results show that the average relative error of the system measurement is 0.14%,and the measurement method has high accuracy,and its stability and accuracy meet the task of automatic dimensional detection of continuous casting rolls.