Generation method of image distortion correction data in two-dimensional galvanometer scanner

Abstract

The invention relates to a generation method of image distortion correction data in a two-dimensional galvanometer scanner. A correction template provided with (2N+1)2 sampling points is included, and N is natural number. The method comprises the steps of: (1), setting a scanning range and points of the correction template in a software program, wherein a standard graph formed by all sampling points on the correction template is consistent with the scanning range, coordinate values of the sampling points on the correction template are computed according to the scanning range, the computed coordinate values of the sampling points are used as data before being corrected to be stored; (2), scanning the sampling points on the correction plate, controlling a moving light beam through the software program to enable the light beam to be coincided with the sampling points on the correction template, recording coordinate values of the scanned sampling points to be used as corrected data of the sampling points; and (3), obtaining the corrected data of all sampling points. The coordinate values before and after being corrected are substituted into a Newton's interpolation formula, i.e. the image distortion problem in the two-dimensional galvanometer scanner is solved.

Description

technical field The present invention relates to a method for generating correction data for image distortion, in particular to the generation of correction data for image distortion in a two-dimensional galvanometer scanner (the Chinese professional term is called "galvanometer", a component used for laser beam scanning). generate method. Background technique Due to the deflection of the laser beam using a two-dimensional galvanometer system, there are the following problems: (1) The installation distance between the two lenses will cause a certain degree of pincushion distortion in the image field. This is because the optical distance between the X lens and the image field is related to the scanning angle between the XY lenses. The larger the scanning angle, the longer the distance; (2) The image distance is not proportional to the scanning angle itself, but proportional to the tangent of the scanning angle, so that the laser marking speed is not proportional to the an...

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Problems solved by technology

This method enables precise correction of various distortions

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