Calibration Jig Segmentation for 3D Measurement Alignment
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Solution Overview
Problem
Existing measurement apparatuses face challenges in calibrating three-dimensional geometry measurements for large or complex targets due to difficulties in capturing precise dimensions of calibration jigs, which can be affected by environmental changes and impact, leading to dimensional deviations.
Innovation Solution
A calibration method involving a computer-controlled system that uses a calibration jig with elements of predetermined shapes, captured by multiple imaging parts, to identify coordinate positions and perform coordinate transformations and translations, ensuring accurate alignment and calibration of the measurement apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a large calibration jig is used to match the size of the measurement target, then the measurement apparatus can measure large targets, but it becomes difficult to measure precise dimensions of the calibration jig
Solution Approach 1:
The calibration jig is divided into multiple discrete elements with predetermined shapes (spheres, cylinders, cubes) arranged at known positions. Instead of measuring the entire large calibration jig as a single object, the system captures and identifies individual elements separately, determining their three-dimensional positions independently. This segmentation allows precise measurement of individual elements even when the overall calibration jig is very large.
2Shape
If a calibration jig with complicated shape is used to match complex measurement targets, then the measurement apparatus can handle complex geometries, but it becomes difficult to measure precise dimensions and environmental changes cause dimensional deviations
Solution Approach 1:
The calibration jig uses simple geometric elements (spheres, cylinders, cubes) with locally uniform and predictable properties at each position. Each element has a simple, well-defined shape with stable dimensional characteristics that are insensitive to environmental changes. The complexity of the overall calibration jig configuration does not compromise the local simplicity and stability of individual elements, allowing precise position determination.
3Area of stationary object
If multiple imaging parts are disposed at various positions to measure large targets, then the measurement apparatus can cover large measurement areas, but it becomes difficult to capture the same calibration jig with all imaging parts
Solution Approach 1:
The calibration jig is designed with multiple elements distributed across its structure so that different subsets of elements can serve different imaging parts. Each imaging part can capture a subset of calibration elements within its field of view, and the system integrates data from all imaging parts to achieve complete calibration. This universal design allows the same calibration jig to effectively calibrate multiple imaging parts positioned at various locations.
Data Source
AI summary
A calibration method including: an imaging step of capturing a part of the calibration jig with a first imaging part and a second imaging part; a first identifying step of identifying first coordinate positions of a part of the calibration jig on the basis of a capturing result of the first imaging part; a second identifying step of identifying second coordinate positions of a part of the calibration jig on the basis of a capturing result of the second imaging part; a rotating step of rotating the calibration jig; a repeating step of repeating the imaging step, the first identification step, the second identification step, and the rotating step; and identifying a rotation matrix for rotating the first coordinate positions or the second coordinate positions to perform a coordinate transformation and a translation vector for translating the first coordinate positions or the second coordinate positions.