Camera Calibration Techniques in Omnidirectional Imaging
Summary
Omnidirectional imaging encompasses methods to capture a 360° field of view using specialised optics such as catadioptric mirrors, fisheye lenses and multi-camera arrays. Accurate mapping between the three-dimensional scene and the recorded image requires precise calibration of both intrinsic parameters (focal length, principal point and lens distortions) and extrinsic parameters (camera pose). Traditional approaches employ calibration targets—planar grids or spherical markers—and iterative optimisation within a chosen projection model. Catadioptric systems combine curved mirrors with conventional lenses, calling for estimation of mirror surface geometry and complex deformation matrices. Fisheye models rely on polynomial or equidistant projection functions to describe radial distortion, while depth-dependent calibration accounts for focus shifts in applications such as photogrammetry. Self-calibration techniques remove the need for fixed targets by exploiting scene structure or motion, though they may trade off accuracy for convenience. Recent advances integrate machine-learning methods to refine distortion estimates in real time, enabling on-the-fly recalibration for robotics, autonomous vehicles and environmental monitoring. The global significance of robust omnidirectional calibration lies in its support for panoramic mapping, immersive virtual reality, advanced driver assistance and meteorological observation.
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Camera Calibration Techniques in Omnidirectional Imaging publication trend
The graph below shows the total number of articles in camera calibration techniques in omnidirectional imaging across all publications each year (not limited to Nature Index journals).
Technical terms
Omnidirectional imaging: Acquisition of a full-sphere view using specialised optics or camera arrays.
Catadioptric system: A combination of reflective mirror and refractive lens elements to achieve wide fields of view.
Intrinsic parameters: Internal camera characteristics including focal length, principal point and lens distortion coefficients.
Orthorectification: The process of removing geometric distortions to produce a planimetrically accurate image.
Radial distortion: Nonlinear deviation of image points radially from the principal point, common in wide-angle lenses.
References
- Comprehensive calibration of omnidirectional mirror and catadioptric optical system dedicated to high-speed video registration of lightning. Measurement (2025).
- Orthorectification of Fisheye Image under Equidistant Projection Model. Remote Sensing (2022).
- Analysis of Fish-Eye Lens Camera Self-Calibration. Sensors (2019).
- Modelling and calibration of depth-dependent distortion for large depth visual measurement cameras.. Optics Express (2017).
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