Dual-camera measuring method for accurate calibration of distance between optical identification points

A measurement method and technology for identifying points, applied in the field of optical measurement, can solve the problems of the influence of the accuracy of the reference ruler, the inability to guarantee the parallelism of the reference ruler and the guide rail, etc. It is simple and easy to implement, easy to measure and verify multiple times, and simple and convenient to operate. Effect

Active Publication Date: 2017-01-04
SOUTHEAST UNIV
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Problems solved by technology

Although the laser length measuring instrument has high precision, the measurement based on this device is a one-dimensional measurement. If the p

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  • Dual-camera measuring method for accurate calibration of distance between optical identification points
  • Dual-camera measuring method for accurate calibration of distance between optical identification points

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[0022] The description will be further described below in conjunction with the embodiments and the accompanying drawings.

[0023] Build a binocular stereo vision system, fix two industrial cameras on an optical anti-vibration platform, determine the field of view and spacing of the cameras according to the distance between the optical marking points to be measured, and make the angle between the two cameras about 25°, place the The single-axis electric displacement platform is placed on the plane where the optical marking point to be measured is located.

[0024] The dual-camera measurement method for distance calibration between optical marking points includes the following steps:

[0025] 1) Initial calibration of the binocular stereo vision system: the figure 1 The checkerboard calibration board shown is placed on the plane where the optical marking points are located, and the mobile workstation is used to control the two cameras to collect the images of the calibration b...

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Abstract

The invention discloses a dual-camera measuring method for accurate calibration of distance between optical identification points. The method, by calibrating the relative position of the two cameras by using a single-shaft motor displacement platform, increases the calibration precision of a binocular stereo vision system and the measuring precision of 3 dimensional coordinates of the optical identification points, and achieves the purpose of accurate calibration of the distance between optical identification points. The method comprises the following steps: using a calibration board to calibration the binocular stereo vision system to obtain the internal parameter matrixes and deformation parameter matrixes of the two cameras and the rotation matrix and the translation vector of the second camera with respect to the first camera; using the single-shaft motor displacement platform to translate a single optical identification point for a known distance, using the known distance to complete the calibration of the binocular stereo vision system; using the calibrated binocular stereo vision system, based on the basic binocular stereo vision theory, to conduct accurate measurement on the distance between two identification points on a reference scale in a direct way.

Description

technical field [0001] The invention belongs to the field of optical measurement and relates to a method for accurately measuring the distance between optical marking points by using digital image processing technology and camera calibration technology. Background technique [0002] With the continuous development of optical equipment and image processing technology, optical measurement technology is widely used in industrial measurement, geodetic mapping and other fields. In these measurements, a standard ruler is used to provide the length reference required for the measurement, and its length is determined by the distance between the centers of two optical marker points. The accuracy of the length of the scale directly affects the accuracy of the measurement results. In order to ensure the quality of the data obtained during engineering measurement, it is necessary to accurately calibrate the distance between the optical marking points on the scale. [0003] At present, ...

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Application Information

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IPC IPC(8): G01B11/14
CPCG01B11/14
Inventor 何小元董帅
Owner SOUTHEAST UNIV
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