In situ calibration of camera-refraction interface based on analytical refractive imaging equation
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913993269968896 |
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| author | Wang, Hongzhe Song, Yang Cai, Huajun Bo, Lin Zhang, Boyan Ji, Yunjing Lai, Jiancheng Li, Zhenhua |
| author_facet | Wang, Hongzhe Song, Yang Cai, Huajun Bo, Lin Zhang, Boyan Ji, Yunjing Lai, Jiancheng Li, Zhenhua |
| contents | Camera calibration is an essential process in photogrammetry, serving as a crucial link between the 2D image coordinate system and the 3D world coordinate system. However, when observations are conducted through refractive interfaces, the refraction effects at these interfaces render traditional calibration methods ineffective, significantly compromising measurement accuracy. To address this challenge, we propose a novel camera calibration method based on the analytical refractive imaging (ARI) equation. The ARI method facilitates accurate estimation of camera parameters from distorted images and enables in-situ joint calibration of both the camera and the refractive interface. The experimental results indicate that the proposed method reduces the error to only 10% of that produced by conventional ray-tracing (RT) method. Moreover, while maintaining comparable computational accuracy and efficiency, it effectively mitigates the local convergence issues that may arise in the polynomial fitting (PF) approach. Finally, reconstruction experiments further confirm the accuracy of the proposed method. Experimental results demonstrate that the proposed method outperforms existing refractive calibration techniques in terms of accuracy while maintaining high precision in 3D reconstruction tasks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_11329 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | In situ calibration of camera-refraction interface based on analytical refractive imaging equation Wang, Hongzhe Song, Yang Cai, Huajun Bo, Lin Zhang, Boyan Ji, Yunjing Lai, Jiancheng Li, Zhenhua Optics Camera calibration is an essential process in photogrammetry, serving as a crucial link between the 2D image coordinate system and the 3D world coordinate system. However, when observations are conducted through refractive interfaces, the refraction effects at these interfaces render traditional calibration methods ineffective, significantly compromising measurement accuracy. To address this challenge, we propose a novel camera calibration method based on the analytical refractive imaging (ARI) equation. The ARI method facilitates accurate estimation of camera parameters from distorted images and enables in-situ joint calibration of both the camera and the refractive interface. The experimental results indicate that the proposed method reduces the error to only 10% of that produced by conventional ray-tracing (RT) method. Moreover, while maintaining comparable computational accuracy and efficiency, it effectively mitigates the local convergence issues that may arise in the polynomial fitting (PF) approach. Finally, reconstruction experiments further confirm the accuracy of the proposed method. Experimental results demonstrate that the proposed method outperforms existing refractive calibration techniques in terms of accuracy while maintaining high precision in 3D reconstruction tasks. |
| title | In situ calibration of camera-refraction interface based on analytical refractive imaging equation |
| topic | Optics |
| url | https://arxiv.org/abs/2508.11329 |