Abstract: The mathematical model of the line structured light vision sensor is established. A novel calibration method to determine all the primitive parameters of the line structured light vision sensor with coplanar reference object is proposed. Without striction to the moving of the calibration reference object, all the parameters can be readily calibrated on site with the calibrated feature points lying on more than 2 local world coordinate frames respectively. The global world coordinates of the calibration feature points in the local world coordinate frame can be computed through the three dimensional camera coordinate frame. Therefore, it is guaranteed that the calibration state is identical to the work state of the line structured light vision sensor. The proposed approach greatly reduces the cost of the calibration equipment and simplifies the calibrating procedure, so it can promote the engineering applications of the line structured light vision sensor handily. It shows that this method is practical in the vision inspection applications by experiments.

Key words: Coplanar reference object Field calibration, Structured light, Vision inspection