Method for overall calibration of galvanometer type line laser scanning three-dimensional measuring system

A technology of three-dimensional measurement and calibration method, which is applied in the field of optical three-dimensional scanning system calibration to achieve the effect of flexible calibration scheme

Active Publication Date: 2017-08-04
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the calibration method of the existing galvanometer-type line laser three-dimensional scanning measurem

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  • Method for overall calibration of galvanometer type line laser scanning three-dimensional measuring system
  • Method for overall calibration of galvanometer type line laser scanning three-dimensional measuring system
  • Method for overall calibration of galvanometer type line laser scanning three-dimensional measuring system

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0041] The galvanometer-type line laser scanning three-dimensional measurement system uses a galvanometer to replace the traditional mechanical scanning platform, and changes the rotation angle of the galvanometer through an external input control voltage, so that the reflected light of the line laser is aligned with the measured object along the direction of the galvanometer rotation. Optical measurement system for scanning surfaces. The extremely high repeatability and extremely small resolution of the galvanometer system make the measurement system expected to have extremely high measurement accuracy, and the level of calibration accuracy determines the level of the final measurement system of the system. The present invention divides the overal...

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Abstract

The invention discloses a method for overall calibration of a galvanometer type line laser scanning three-dimensional measuring system. First two lenses whose effective focal lengths are f1 and f2 are selected, and a camera is utilized to shoot a plane target and feature point coordinates are extracted, and main point coordinates of an image are calculated according to a varifocal method; then the lens whose focal length is f1 is used as a lens of the system, and for the feature point coordinates on the plane target which are obtained by the lens, intrinsic parameters and extrinsic parameters of the camera are calibrated; next, by changing galvanometer control voltage and driving a one-dimensional translation table to move, line laser stripes in different depth directions and different optical planes are obtained, and through operation of plane fitting and intersecting line obtaining, a transformation relation between a target coordinate system and a world coordinate system is obtained; and finally, coordinates under a system model are all unified to an image pixel coordinate system and the world coordinate system, thereby completing calibration of the whole system. The method has the advantages of simple calibration process, high calibration precision, fast calibration speed and the like.

Description

technical field [0001] The invention belongs to the technical field of optical three-dimensional scanning system calibration, and in particular relates to an overall calibration method for a galvanometer-type line laser scanning three-dimensional measurement system. Background technique [0002] With the advancement of modern precision measurement technology, three-dimensional measurement technology has developed rapidly and is widely used in product design, quality control, reverse engineering, biomedical and many other fields. Due to the limitations of slow measurement speed, high cost, small measurement range and easy scratches on the surface of the measured object, non-contact 3D measurement technology has been rapidly developed and widely used in recent years. Among them, the 3D laser scanning measurement technology based on laser triangulation has become a current research hotspot due to its high measurement accuracy, wide range and easy intelligent integration. [00...

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/2504G01B11/2518
Inventor 杨树明杨林林杨新宇薛兴昌张国锋
Owner XI AN JIAOTONG UNIV
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