Calibration Jig for Camera Parameter Calculation
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Solution Overview
Problem
Current methods for calculating the position and orientation of image sensing devices in a physical space face challenges when indices are occluded or have poor visibility, and manual calibration is labor-intensive and imprecise, especially when a sufficient number of reference indices cannot be allocated within the image sensing range of each objective viewpoint camera.
Innovation Solution
An information processing apparatus that integrates relative and absolute orientation processes in camera calibration, using a calibration jig with multiple image sensing devices to acquire and extract image coordinates of indices, allowing for simultaneous calculation of camera parameters and index positions, even when indices cannot be linked to reference indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual measurement is used for calibration, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces manual mechanical measurement methods with an automated image-based calibration system. The computing device processes images captured by image sensing devices to automatically calculate allocation information of indices, substituting manual ruler/protractor measurements with computational image analysis that achieves both ease of operation and high measurement precision.
2Measurement precision
If indices are densely allocated on the physical space, then measurement precision is improved, but device complexity deteriorates
Solution Approach 1:
The calibration jig serves multiple functions: it provides a coordinate system reference, contains multiple indices for simultaneous observation, and enables calibration of multiple image sensing devices. This multi-functionality allows accurate calibration without requiring dense allocation of separate indices throughout the physical space, reducing overall system complexity.
Solution Approach 2:
The calibration jig acts as an intermediary object that mediates the calibration process. By placing indices on the movable calibration jig rather than densely distributing them throughout the environment, the system achieves accurate calibration while maintaining simpler device complexity.
3Measurement precision
If a sufficient number of reference indices are allocated within the image sensing range, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The calibration jig is designed to be movable within the image sensing range, allowing dynamic repositioning to optimize the distribution of indices within the camera's field of view. This dynamic capability enables the system to achieve measurement precision equivalent to having many fixed reference indices distributed throughout the space, while maintaining ease of operation through simple jig movement rather than complex environmental setup.
Data Source
AI summary
When a calibration jig (50) which includes an image sensing device (100) is moved within the image sensing range of an image sensing device (200), the image coordinates of an index (110) on the image sensing device (100) in a plurality of images sensed by the image sensing device (200) are extracted. The image coordinates of environment allocation indices (300) in a plurality of images sensed by the image sensing device (100) are extracted. An information processing apparatus (1000) calculates camera parameters of the image sensing device (200) based on the extracted image coordinates of the index (110) and the environment allocation indices (300).