Remote large depth of field multi-spectral displacement measurement method for automatic compensation of deformation of a measuring platform

By combining multi-camera regional or single-camera scanning monitoring with Gaussian distribution targets and digital image processing technology, the problems of large deformation error and low accuracy of the measuring platform in long-distance measurement are solved, and high-precision automated displacement measurement is realized.

CN121112913BActive Publication Date: 2026-06-09CHINA RAILWAY 20TH BUREAU GROUP CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA RAILWAY 20TH BUREAU GROUP CO LTD
Filing Date
2025-11-04
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies for long-distance measurement suffer from problems such as large deformation errors of the measuring platform, low accuracy, and insufficient automation. In particular, machine vision measurement platforms are not sensitive to changes in the optical axis direction image, and RTK measuring instruments are expensive.

Method used

The system employs multi-camera regional monitoring or single-camera scanning to monitor changes in the center of the target under test. Combined with active illumination targets with Gaussian light intensity distribution and digital image processing technology, the target spot center is extracted through feature point matching and centroid algorithm, thereby achieving automatic compensation for platform deformation and improving measurement accuracy.

Benefits of technology

It achieves high-precision, automated long-distance, large-depth-of-field displacement measurement, eliminates errors caused by platform deformation, and improves measurement efficiency and reliability.

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Abstract

The method for long-distance large-DOF multi-spectral displacement measurement of automatic compensation of deformation of measuring platform adopts multi-camera sub-region monitoring or single-camera scanning monitoring of the center change of the target to be measured to complete multi-point high-precision deformation measurement of the building; the target is designed into an active illumination target with Gaussian distribution (or other low-frequency light intensity distribution) of light intensity, the center of the target light spot is extracted by using the digital image processing technology such as feature point matching and barycentric algorithm, and the center extraction of the target center is better than 0.1 pixel; the magnification of the camera lens (fixed focus or zoom) is automatically corrected through the change of multiple light spot centers with a fixed interval of a single target; the measurement accuracy, the measurement efficiency and the reliability are improved through error compensation of six-degree-of-freedom deformation of the measuring platform.
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