Aimed to realize on-site calibration of line structured light vision sensor in flexible online laser visual measurement system for car body-in-white

a calibration method based on invariance of cross-ratio is used in the industrial field.In this method

without restriction to the moving of the planar pattern

all the camera parameters can be readily calibrated with the mathematical model.Invariance of cross-ratio perspective projection is used to obtain calibration feature points to realize the on-site calibration of sensors.The experimental results show that this calibration method has the advantage of high-precision and the sensor precision calibrated by this method completely meet demands of measuring precision of body-in-white car.