Rapid on-site recalibration for binocular vision galvanometric laser scanning system.

Abstract

The binocular vision galvanometric laser scanning (BGLS) system, which consists of a traditional galvanometric laser scanning (GLS) system and a stereo vision system, is widely applied in various advanced manufacturing fields such as 3-dimensional (3D) laser cutting and 3D laser projection positioning. The BGLS system usually needs to be recalibrated before it is put to a certain use, since the camera parameters, as well as the relative pose between the camera and the GLS, may be changed with different applications. However, a full calibration of the BGLS system requires elaborate modeling and mass calibration data, which considerably affect the efficiency of the BGLS system. A rapid on-site recalibration method is proposed, which can substantially improve the efficiency and flexibility of the BGLS system. With the method, the BGLS system needs to be carefully off-site calibrated for only one time. The on-site precise recalibration can be quickly realized by taking only two images of the laser spots projected by the GLS on a planar board. Moreover, an ingenious linear solving method is proposed to make the whole computation process more stable and timesaving. On-site recalibration and target shooting experiments are respectively conducted to verify the proposed method.