为实现辊压成形钢材生产线上运动工件表面轮廓及关键几何结构尺寸非接触下高精度快速在线测量，提出了一种基于多目视觉线结构光的辊压件在线测量系统。该系统首先通过多目标定原理并采用一个平面标靶来实现高精度全局标定，计算多测头测量坐标系空间位姿关系，然后采用二阶算法进行图像高精度的投影校正完成三维重建，最后提取亚像素级的光条纹中心，通过剪枝算法去除条纹中心线上的随机误差，获取线结构光精确的点云数据，重构出工件的横截面特征，并测量计算其折弯角数值和外轮廓尺寸，在线监控工件外轮廓尺寸。测量试验表明，该在线测量系统精度为0.05 mm，具有较高精确度与准确性，可大幅度提升工件检测效率，在辊压成形工件测量产业具有良好应用前景。

For achieving non-contact high-precision and rapid online measurement of the surface contour and key geometric dimensions of moving workpieces on a roll forming steel production line, the paper presents a roll-formed part online measurement system based on multi-view vision and structured light. Initially, the system achieves high-precision global calibration using a planar target and multi-objective calibration principles. And then the spatial pose relationship of multi-head measurement coordinate system space was calculated. Subsequently, second-order algorithms were employed for precise image projection correction to accomplish 3D reconstruction. Finally, the center of light stripes at sub-pixel level was extracted. Firstly, a pruning algorithm was utilized to eliminate random errors along the stripe center line, and then obtain precise point cloud data of the structured light, next reconstruct the workpiece's cross-sectional features and measurement of its bending angles and outer contour dimensions, and finally complete online monitoring of workpiece dimensions. Experimental results demonstrate that the measurement accuracy of this online measurement system is 0.05 mm, which indicates its high precision and accuracy. This system has promising applications in the roller-forming industry and significantly improving workpiece detection efficiency.