基于线型激光的钢板表面缺陷三维检测技术

提出将线型激光束垂直投射到钢板表面,通过面阵CCD摄像机采集激光线在钢板表面的图像来计算表面缺陷深度的三维检测方法.利用中点法对激光图像进行细化,并根据稳定点判别依据提取激光线形.采用分区标定方法对摄像机进行标定,由空间还原思想恢复激光线形的空间坐标.根据扫描投影的方法选择理想表面方向作为缺陷深度计算的基准,实现对缺陷深度信息的定量计算.通过对缺陷样品验证的结果表明,采用该方法得到的计算值与实际值非常接近.

3D Detection Technique for Surface Defects of Steel Plates Based on Linear Laser

A method of 3-D defection for surface defects is presented with a light beam emitted by a linear laser, which is projected on the surface of steel plates vertically, and the surface images of steel plates are captured by an area-scan camera. Midpoint thinning is applied, and laser lines are extracted according to stabilization points. Partitioning calibration is proposed for calibration of the camera, and space coordinates of the laser lines are calculated based on the concept of space revert. Referential planes for depth calculation of defects are selected by projection scanning. The method was examined with defect samples, and the result of depth calculation was very close to experimental value.