Vehicle Camera Calibration Apparatus with Confirmation Marker
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Solution Overview
Problem
Existing camera calibration methods for on-board vehicle cameras are inefficient due to reliance on manual adjustments, leading to unstable precision and increased productivity losses from rejected products, even when automatic calibration is only slightly insufficient.
Innovation Solution
A semi-automatic calibration apparatus that displays a confirmation marker indicating the theoretical position of calibration points, allowing workers to visually confirm and manually adjust camera parameters, ensuring accurate alignment without fully relying on automatic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment is used for camera calibration, then the calibration can be performed with simple construction, but the calibration time becomes long and the precision becomes unstable
Solution Approach 1:
The system performs automatic calibration using image processing algorithms that automatically detect calibration markers and calculate camera parameters without requiring manual worker intervention for each adjustment step, thereby reducing calibration time while maintaining precision
Solution Approach 2:
The patent replaces manual mechanical adjustment operations with automated image processing and calculation systems that use computer vision algorithms to determine camera parameters, eliminating the need for workers to manually adjust components while achieving higher precision and speed
2Measurement precision
If automatic calibration is performed, then the calibration precision is improved, but products with slight failures are uniformly rejected, increasing the number of defective products
Solution Approach 1:
The system performs automatic calibration first to achieve high precision, then applies a lenient acceptance criterion that allows products with calibration results within a relaxed tolerance range to pass, thereby reducing unnecessary rejections while maintaining adequate quality standards
Solution Approach 2:
The patent introduces an acceptance criterion parameter that can be adjusted to balance between precision and productivity, allowing the system to adaptively determine which products to reject based on their specific calibration results rather than applying a uniform rejection standard
3Reliability
If strict acceptance criteria are applied, then the calibration quality is ensured, but the productivity deteriorates due to increased rejections
Solution Approach 1:
The system applies a two-tiered approach where automatic calibration provides high precision, but the acceptance criterion is set to accept a broader range of results, ensuring that only products with significant defects are rejected, thereby maintaining quality while preserving productivity
Data Source
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AI summary
Provided is a calibrating apparatus for an on-board camera of a vehicle, which apparatus allows completion of calibration process with a simple additional calibration, even when rejection has issued on the result of automatic calibration. Based upon a camera parameter obtained at the time of completion of adjustment by an automatic adjusting section (30), a confirmation marker indicating the position of coordinate of a calibration point is displayed in superposition with a camera-captured image. A manual adjusting section (60) adjusts the camera parameter, based on an amount of displacement of the coordinate of the calibration point corresponding to an amount of movement of the confirmation marker moved in response to input of adjustment instruction. In response to input of a determination instruction, a camera parameter setting section (19) sets an undetermined camera parameter at the time of completion of the most recent adjustment by the automatic adjusting section (30) and the manual adjusting section (60), as the camera parameter.