Multi-Plane Calibration Chart for Single-Capture Camera Parameter Acquisition
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Solution Overview
Problem
The existing calibration methods, such as the Zhang method, require multiple setups and captures of imaging apparatus and charts, leading to a heavy workload and potential loss of versatility, while simpler methods may not achieve comparable accuracy.
Innovation Solution
A calibration system and method utilizing a chart with multiple plane surfaces forming a predetermined angle, where feature points are detected and transformed to generate feature point information for accurate camera parameter acquisition, reducing the need for multiple captures and maintaining high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Zhang method is used for calibration, then measurement precision is improved, but loss of time increases due to multiple setups and captures
Solution Approach 1:
The patent combines multiple calibration planes into a single chart structure, allowing all planes to be captured simultaneously in one imaging operation. This merging of calibration elements eliminates the need for multiple separate captures while maintaining the precision requirements of the Zhang method.
Solution Approach 2:
The patent introduces a multi-plane three-dimensional chart structure that extends calibration into the depth dimension. By arranging calibration planes at different angles and positions in 3D space, the system captures calibration data from multiple viewpoints simultaneously, reducing time loss while preserving measurement precision.
2Measurement precision
If multiple captures are performed for calibration, then measurement precision is improved, but productivity decreases due to heavy workload
Solution Approach 1:
The patent merges multiple calibration operations into a single imaging capture by using a multi-plane chart. This allows the system to gather calibration data from multiple planes and angles simultaneously, improving productivity without sacrificing the precision that would require multiple separate captures.
Solution Approach 2:
The multi-plane chart is designed to automatically provide calibration data for multiple viewpoints and planes within a single capture. The chart structure itself enables the system to perform what would otherwise require multiple manual setup and capture operations, thereby increasing calibration efficiency.
3Loss of time
If restraint conditions are applied to reduce imaging workload, then loss of time is reduced, but adaptability is lost
Solution Approach 1:
The multi-plane chart is designed to be versatile and adaptable to different calibration scenarios. It can accommodate various plane angles and configurations while still enabling single-capture calibration, thus maintaining method versatility without requiring restraint conditions that would limit adaptability.
4Ease of operation
If a simple calibration method is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent combines the simplicity of single-capture operation with the precision of multi-viewpoint calibration by using a multi-plane chart. This allows the operator to perform a simple single imaging operation while the chart structure ensures that sufficient calibration data from multiple angles is captured to maintain high measurement precision.
Data Source
AI summary
Provided is a calibration apparatus that performs calibration by using a captured image of a chart including a plurality of plane surfaces forming a predetermined angle θ. An imaging apparatus simultaneously images chart patterns depicted on each of the plane surfaces of the chart. In this instance, the chart pattern depicted on each of the plane surfaces of the chart is inversely projected in accordance with a distance from an imaging plane such that patterns in which feature points are uniformly distributed within the captured image are obtained.