研究目的
Investigating an effective method for camera calibration in defocus scenes using circular gratings.
研究成果
The proposed method is effective for camera calibration in defocus scenes, demonstrating robustness to defocus and feasibility in simplifying calibration targets. It provides a solution for long-range vision systems by reducing the size of calibration targets.
研究不足
The method's robustness decreases with high levels of image noise, and the accuracy of imaged center extraction is crucial for the calibration's success.
1：Experimental Design and Method Selection:
The method utilizes three phase-shifting circular gratings for camera calibration in defocus scenes. It involves generating circular gratings using phase-shifting methods and extracting zero-phase points for calibration.
2：Sample Selection and Data Sources:
Simulated and real images captured from different viewpoints are used. The real images are captured using a Canon EOS-M2 camera with an LCD monitor displaying the patterns.
3：List of Experimental Equipment and Materials:
LCD monitor (AOC E2436V), Canon EOS-M2 camera with a zoom lens, MATLAB for implementation.
4：Experimental Procedures and Operational Workflow:
Patterns are displayed on the LCD and captured by the camera at different orientations. The wrapped phase is calculated, and zero-phase points are detected for circle center estimation and refinement.
5：Data Analysis Methods:
The intrinsic parameters of the camera are estimated using the circular point constraints and pole-polar relationship. The performance is evaluated based on the relative difference between estimated and ideal parameters.
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