Calibration of line structuredlight vision measurement system based on freetarget
YANG Kai, YU Houyun, YANG Chao
(College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
 

Abstract: Aiming at the problem of existing line structured light vision measurement system calibration method such as low efficiency, complex operation, a approach of calibration based on free plane targets was proposed. This method took planar target as a calibration object. First, according to the twodimensional plane calibration theory of Zhang, the internal and external parameters of the camera was calculated. Then the line structuredlight and free planar target were introduced, with taking intersectionpoints of laser stripe and checkerboard border in a variety of target positions as feature points, the coordinates of the feature points in the camera coordinate system were calculated, and structurelight equation of plane to complete the whole measurement system calibration was fitted. The results indicate that the line structured light vision measurement system measurement error is less than 1% by the above methods of calibration, and reaches the high calibration precision.
Key words: structuredlight; visionmeasurement; calibration lightplane; planartarget