Calibration method based on measurement field formed by multiple cameras

By adopting a measurement field calibration method composed of multiphase mechanisms in three-dimensional measurement of large and complex components, the coordinated calibration of laser tracker and photogrammetry system is used to solve the problems of low splicing accuracy and complex calculations, and high-precision and rapid measurement are achieved.

CN119879732APending Publication Date: 2025-04-25CHENGDU AIRCRAFT INDUSTRY GROUP
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Patent Information

Application Number
CN202510090680.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-21
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

The prior art is difficult to meet the needs of fast on-site measurements in three-dimensional measurements of large and complex components.

Method used

A calibration method based on a measurement field composed of a multiphase mechanism is adopted. By arranging the target ball base of the laser tracker in the global system field of view as a reference point, and co-calibrating with the photogrammetry system is used for coordinated calibration, the number of coordinate system conversions between cameras is reduced, and the coordinate system conversion is performed only once.

Benefits of technology

It improves the splicing accuracy of the measurement field built by multi-phase mechanisms, reduces the difficulty of calculation, and meets the high-precision and rapid measurement requirements of large and complex components.

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Abstract

The invention relates to the technical field of inspection and detection, in particular to a calibration method based on a measurement field formed by multiple cameras. Firstly, a target ball and a target seat of a laser tracker are arranged in a field of view of a global system to serve as reference points, the laser tracker is arranged near a photogrammetry system, a reflector target ball of the laser tracker is used for measuring the reference points respectively, obtained coordinates of all the reference points are fitted, and the coordinates of all the reference points are obtained. Shooting the same reference points by using a photogrammetric system, performing alignment conversion on the obtained coordinates of the photogrammetric reference points and the coordinate system of the reference points measured and fitted by each laser tracker, and finally converting the coordinates of each photogrammetric system to the coordinate system of the reference points measured and fitted by each laser tracker. The number of times of coordinate system conversion between the cameras is reduced, only one-time coordinate system conversion is carried out, and the splicing precision of the measurement field constructed by the multiple cameras is improved.
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Citation Information

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