Iterative calibration method and system for optical distortion and pose of laser scanning system

Abstract

The invention belongs to the technical field of laser processing, and particularly relates to an iterative calibration method and system for optical distortion and poses of a laser scanning system. The method comprises the following steps: S1, generating N ideal points; s2, performing two-dimensional coordinate transformation on the ideal point; s3, N actual points are printed on the target paper on the translation table; s4, calculating target coordinates of the N translation stages; s5, measuring the coordinate of the current target coordinate point in the camera coordinate system; s6, performing data processing by using the rotation matrix; s7, calculating the transformed rotation matrix and a vector from the original point of the camera to the original point of the laser scanning system; s8, calculating to obtain a distortion coefficient matrix obtained by current iteration; s9, fusing the data obtained by the current iteration with the value of the last iteration, and taking the fused value as the input value of the next iteration; and S10, repeating the steps S2 to S9 to obtain a final calibration result. The method has the advantages of being convenient to operate and high in calibration precision.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to an iterative calibration method and system for optical distortion and pose of a laser scanning system. Background technique [0002] In the laser processing industry, a galvanometer and a field mirror are commonly used to form a laser scanning system. The former realizes beam scanning and the latter realizes beam focusing. This processing device has high scanning efficiency, so it has a wide range of uses in laser marking, laser drilling, laser cutting and laser 3D printing. The ideal field lens conforms to the f-θ model, that is, when the galvanometer deflects the beam to an angle θ with the optical axis of the field lens, the distance between the focal point and the optical axis on the working surface after the beam passes through the field lens is d=f*θ , that is, the declination angle of the beam is linearly related to the position of the focal point of ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem that in the prior art, the traditional calibration method usually calibrates the distortion and relative pose of the laser scanning system separately, which is not only inconvenient, but also unable to jointly optimize the distortion and pose parameters, which easily leads to poor final calibration results. To solve the problem, an iterative calibration method and system for the optical distortion and pose of the laser scanning system are provided which are easy to operate and high precision

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