A calibration method based on perspective-three-point was proposed to solve the calibration problems in line structured light sensor system such as requirement of high accuracy calibration model

complicate calibration procedure and so on. The calibration model used a coplanar reference target with three collinear and known distance points. The line across the three points intersected the laser stripe at a point that was called as the calibration point. The calibration point coordinates in the camera coordinate system can be calculated by using the imaging information of the three points and that of the light stripe on the camera’s image plane. The spatial pose between camera and light plane can be calibrated by moving the reference plane at several arbitrary places in the sensor range. Experiments show that the sensor can attain relative accuracy about 0.8%.The method decreased the cost of calibration equipment

and needn’t calculate the transformation matrix between different coordinate systems. The method is simple and flexible

and can satisfy the precision requirements