3D Geometry Measurement Correction via Reference Instrument Calibration
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Solution Overview
Problem
Existing 3D geometry measurement methods face challenges in achieving accurate measurements due to image distortion caused by optical imperfections, which current calibration methods struggle to fully correct.
Innovation Solution
A 3D geometry measurement apparatus and method that utilize a reference instrument with feature points to identify coordinates of reference and virtual captured pixels, generating correction information to accurately correct measurement-target pixel coordinates using geometric property information and relative position data, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration methods using light of specific wavelength are used, then the calibration process can be performed, but the measurement precision is insufficient due to complicated image distortion
Solution Approach 1:
The patent segments the distortion correction process into two independent stages: (1) obtaining geometric property information including distortion characteristics through reference instrument calibration, and (2) applying this information to correct measurement target images. This segmentation allows comprehensive distortion modeling without compromising measurement precision.
Solution Approach 2:
The patent performs preliminary calibration by capturing images of a reference instrument with known geometric properties before actual measurement. This preliminary action obtains distortion characteristics and geometric property information that are stored and applied during subsequent measurements, ensuring both precision and reliability.
2Ease of manufacture
If simple calibration methods are used, then the calibration process is simple, but the image distortion cannot be fully corrected
Solution Approach 1:
The patent introduces a reference instrument with known geometric properties as an intermediary object during calibration. This intermediary enables the system to accurately model distortion characteristics without requiring complex mathematical formulations, thus maintaining simplicity while achieving high correction accuracy.
Solution Approach 2:
The patent changes the approach from attempting to directly correct complex distortion to first measuring and storing distortion parameters through reference instrument calibration. These parameters are then applied to correct measurement images, simplifying the process while maintaining precision through parameter-based correction.
Data Source
AI summary
A three-dimensional geometry measurement apparatus including a virtual coordinate identification part that identifies coordinates of a virtual captured pixel corresponding to a feature point in an image plane of a capturing device by virtually projecting the feature point on a reference instrument onto the image plane: correction part that generates correction information for correcting coordinates of the measurement-target captured pixel included in a measurement-target captured image; and a geometry identification part that corrects coordinates of a plurality of the measurement-target captured pixels included in the measurement-target captured image generated by capturing an object to be measured with the capturing device on the basis of geometric property information and the correction information, and identifies a geometry of the object to be measured on the basis of measurement three-dimensional coordinates to be calculated based on the coordinates of the measurement-target captured pixels.