Iterative Camera Calibration Method Based on Concentric Circle Grids
A concentric circle target is commonly used in the vision measurement system for its detection accuracy and robustness. To enhance the camera calibration accuracy, this paper proposes an improved calibration method that utilizes concentric circle grids as the calibration target. The method involves...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/14/5/1813 |
| _version_ | 1797264848721018880 |
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| author | Liang Wei Ju Huo Lin Yue |
| author_facet | Liang Wei Ju Huo Lin Yue |
| author_sort | Liang Wei |
| collection | DOAJ |
| description | A concentric circle target is commonly used in the vision measurement system for its detection accuracy and robustness. To enhance the camera calibration accuracy, this paper proposes an improved calibration method that utilizes concentric circle grids as the calibration target. The method involves accurately locating the imaged center and optimizing camera parameters. The imaged concentric circle center obtained by cross-ratio invariance is not affected by perspective projection, which ensures the location accuracy of the feature point. Subsequently, the impact of lens distortion on camera calibration is comprehensively investigated. The sub-pixel coordinates of imaged centers are taken into the iterative calibration method, and camera parameters are updated. Through simulations and real experiments, the proposed method effectively reduces the residual error and improves the accuracy of camera parameters. |
| first_indexed | 2024-04-25T00:35:25Z |
| format | Article |
| id | doaj.art-6a0965c92fe543ce8b9ea67881301709 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-04-25T00:35:25Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-6a0965c92fe543ce8b9ea678813017092024-03-12T16:39:03ZengMDPI AGApplied Sciences2076-34172024-02-01145181310.3390/app14051813Iterative Camera Calibration Method Based on Concentric Circle GridsLiang Wei0Ju Huo1Lin Yue2School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, ChinaSignal and Communication Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaA concentric circle target is commonly used in the vision measurement system for its detection accuracy and robustness. To enhance the camera calibration accuracy, this paper proposes an improved calibration method that utilizes concentric circle grids as the calibration target. The method involves accurately locating the imaged center and optimizing camera parameters. The imaged concentric circle center obtained by cross-ratio invariance is not affected by perspective projection, which ensures the location accuracy of the feature point. Subsequently, the impact of lens distortion on camera calibration is comprehensively investigated. The sub-pixel coordinates of imaged centers are taken into the iterative calibration method, and camera parameters are updated. Through simulations and real experiments, the proposed method effectively reduces the residual error and improves the accuracy of camera parameters.https://www.mdpi.com/2076-3417/14/5/1813concentric circlecross-ratio invarianceiterative camera calibrationlens distortion |
| spellingShingle | Liang Wei Ju Huo Lin Yue Iterative Camera Calibration Method Based on Concentric Circle Grids Applied Sciences concentric circle cross-ratio invariance iterative camera calibration lens distortion |
| title | Iterative Camera Calibration Method Based on Concentric Circle Grids |
| title_full | Iterative Camera Calibration Method Based on Concentric Circle Grids |
| title_fullStr | Iterative Camera Calibration Method Based on Concentric Circle Grids |
| title_full_unstemmed | Iterative Camera Calibration Method Based on Concentric Circle Grids |
| title_short | Iterative Camera Calibration Method Based on Concentric Circle Grids |
| title_sort | iterative camera calibration method based on concentric circle grids |
| topic | concentric circle cross-ratio invariance iterative camera calibration lens distortion |
| url | https://www.mdpi.com/2076-3417/14/5/1813 |
| work_keys_str_mv | AT liangwei iterativecameracalibrationmethodbasedonconcentriccirclegrids AT juhuo iterativecameracalibrationmethodbasedonconcentriccirclegrids AT linyue iterativecameracalibrationmethodbasedonconcentriccirclegrids |