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A dual-camera measurement method for precise calibration of the distance between optical marking points

A measurement method and technology for identifying points, which are applied in the field of optical measurement, can solve the problems such as the inability to guarantee the parallelism of the reference ruler and the guide rail, and the influence of the accuracy of the reference ruler, and achieve a simple and easy-to-implement, error-eliminating method that is easy to measure and verify multiple times. Effect

Active Publication Date: 2018-10-23
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 parallelism between the reference ruler and the guide rail cannot be guaranteed, it will have a great impact on the accuracy of the reference ruler

Method used

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  • A dual-camera measurement method for precise calibration of the distance between optical marking points
  • A dual-camera measurement method for precise calibration of the distance between optical marking points

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Embodiment Construction

[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 measurement method for precise calibration of the distance between optical marking points. A single-axis electric displacement platform is used to calibrate the relative positional relationship of the dual cameras, thereby improving the calibration accuracy and optical marking points of a binocular stereo vision system. The three-dimensional coordinate measurement accuracy is high, in order to achieve the purpose of accurate measurement of the distance between optical marking points. The method comprises the following steps: using a calibration board to calibrate the binocular stereo vision system to obtain the internal parameter matrix of the two cameras, the distortion parameter matrix, the rotation matrix and the translation vector of the second camera relative to the first camera; The displacement platform performs a known distance translation on a single optical mark point, and uses the known distance to complete the calibration of the binocular stereo vision system; using the calibrated binocular stereo vision system, according to the basic principle of binocular stereo vision, the direct reference ruler Accurately measure the distance between the two marked points.

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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14
CPCG01B11/14
Inventor 何小元董帅
Owner SOUTHEAST UNIV
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