Wide-angle lens calibration via rotation and reference alignment
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Solution Overview
Problem
Conventional wide-angle lens calibration systems fail to effectively address image distortion and geometric shape inaccuracies, leading to incorrect representation of objects in captured images, and require specialized devices or complex processing technologies, increasing costs.
Innovation Solution
A wide-angle lens calibration system comprising a rotation unit, image input unit, and processing unit that aligns the optical axis with a reference object, continuously rotates to record image distortions, and uses simple math models to establish a distortion calibration model, allowing for axial ratio and optical axis center calibration without specialized equipment or high-precision processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional field of view calibration method is used, then the calibration process is simple, but the image distortion and geometric shape inaccuracies cannot be effectively solved
Solution Approach 1:
The system uses the wide-angle lens itself to capture images of a reference object, and the processing unit automatically analyzes these images to generate calibration parameters. The lens calibrates itself without requiring external specialized equipment, achieving high-precision distortion calibration while keeping the system simple.
Solution Approach 2:
The system captures multiple images of a reference object at different rotation angles, creating a set of image data copies. By analyzing the positional relationships and distortion patterns across these copied images, the system establishes accurate calibration models without needing complex specialized measurement devices.
2Adaptability or versatility
If wide-angle lens is used to capture images with larger shooting range, then the angle of view is wider, but the object in the image is seriously distorted and geometric shape is incorrect
Solution Approach 1:
The system changes the rotational parameter of the lens to capture reference object images at multiple different angles. By analyzing how the reference object's position and shape change with rotation angle, the system calculates distortion calibration parameters that compensate for wide-angle distortion, maintaining geometric accuracy while preserving the wide shooting range.
Solution Approach 2:
The processing unit continuously analyzes the captured images to detect distortion patterns and calculates calibration parameters based on the deviation from expected geometric relationships. This feedback loop enables the system to accurately characterize and correct distortion effects across the entire wide field of view.
3Measurement precision
If specialized devices or complex processing technologies are used for calibration, then the calibration precision may be improved, but the costs increase
Solution Approach 1:
The system replaces expensive specialized calibration devices with a simple reference object and uses standard image processing algorithms instead of complex proprietary technologies. This substitution achieves high calibration precision while dramatically reducing both equipment and implementation costs.
Solution Approach 2:
The system replaces complex mechanical measurement systems with an optical-imaging-based approach. By using the lens's own imaging capability to capture and analyze reference object images, the system eliminates the need for specialized mechanical measurement devices while achieving accurate distortion calibration through computational methods.
Data Source
AI summary
A wide-angle lens calibration system is provided, which may include a rotation unit, an image input unit, and a processing unit. A lens to be calibrated may be disposed on the rotation unit; the rotation direction of the rotation unit may be parallel to the horizontal direction; the optical axis center of the lens may be aligned with a reference object. The image input unit may receive images from the lens. The processing unit may control the rotation unit to rotate and analysis the images received from the lens. The processing unit may execute a distortion calibration process, wherein the processing unit may continuously rotate the rotation unit by a predetermined angle and then record the distance between the position of the reference object in the image and the optical axis center and a total rotation angle after each rotation so as to establish a distortion calibration model.