Camera Calibration Using Automated Pose Adjustment
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Solution Overview
Problem
Current camera calibration methods face challenges in precision due to the limitations of calibration board flatness, printing precision, and manual movement, which affect the accuracy of the world coordinate system and the calibration process.
Innovation Solution
A parameter calibration method and apparatus that generate a calibration pattern and use pose parameters to accurately adjust the position and angle of an image shooting device relative to the calibration pattern, ensuring precise photography and improved calibration precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a calibration board is manually moved to change angle and position, then the calibration process can be performed, but the position determination accuracy deteriorates due to manual operation limitations
Solution Approach 1:
The patent replaces manual mechanical movement of the calibration board with an automated imaging device system. The imaging device is automatically moved to different positions and angles by a motion mechanism, eliminating manual positioning errors. The system uses computer-controlled positioning to achieve precise reproduction of calibration board positions, directly resolving the contradiction between ease of operation and measurement precision.
Solution Approach 2:
The patent creates a digital copy of the calibration board through image capture and uses this digital information for calibration calculations. Instead of relying on physical measurement of the calibration board's position, the system captures images of the calibration board at multiple positions and uses image processing to determine feature point coordinates, thereby achieving high precision without manual measurement.
2Ease of manufacture
If printing precision of the calibration board is low, then the calibration board can be easily manufactured, but the world coordinate system precision deteriorates
Solution Approach 1:
The patent changes the critical parameter from physical printing precision to image capture precision. Instead of relying on the calibration board's physical manufacturing precision, the system uses high-resolution image capture and digital image processing to determine feature point positions. This parameter transformation allows the calibration board to be easily manufactured while maintaining high world coordinate system precision through digital measurement.
Solution Approach 2:
The patent creates a digital copy of the calibration board's feature points through image capture. The digital image serves as an accurate representation of the calibration board's geometry, replacing the need for high-precision physical printing. The image processing system extracts precise coordinates from the digital image, achieving high measurement precision regardless of the calibration board's manufacturing quality.
3Ease of manufacture
If the calibration board flatness is low, then the calibration board is easier to manufacture, but the calibration precision deteriorates
Solution Approach 1:
The patent replaces physical flatness requirements with digital image processing. Instead of requiring the calibration board to be physically flat, the system captures images from multiple angles and uses computational methods to determine the three-dimensional positions of feature points. This substitution eliminates the flatness requirement while maintaining measurement precision through digital reconstruction.
Solution Approach 2:
The patent transitions from two-dimensional flat board measurement to three-dimensional spatial reconstruction. By capturing images from multiple angles and positions, the system reconstructs the calibration board's feature points in three-dimensional space. This dimensional transformation allows non-flat boards to be used while achieving high precision through computational geometry.
Data Source
AI summary
This application provides a parameter calibration method and apparatus, which may be applied to calibration of an intrinsic parameter and an extrinsic parameter of an image shooting device. According to the method and apparatus, with a position of a calibration pattern fixed, a position and an angle of the image shooting device relative to the calibration pattern are accurately adjusted by changing a pose parameter of the image shooting device, so that the image shooting device photographs the calibration pattern at each given position and angle relative to the calibration pattern, to obtain at least one shooting result. The shooting result can correspond to coordinate in a pixel coordinate system and a world coordinate system, so that accuracy of an intrinsic parameter and an extrinsic parameter is correspondingly calculated.