The Iterative Method of Camera Calibration

doi:10.13474/j.cnki.11-2246.2018.0175

Abstract

Abstract: Accurate camera calibration is important for photogrammetric measurement.Traditional camera calibration methods are using the indoor/outdoor control fields and the effective camera calibration models to estimate the distortion coefficients.The various cameras have different distortions,so multi-camera calibration models are selected for calibration applications.It's desirable to find an ideal model that can be applied to most of cameras.Based on the analysis of the existing camera calibration models and methods,in this paper,a new camera calibration approach,named the iterative calibration method,is proposed.Firstly,a simple outdoor control field is established using the existing objects.Secondly,an iterative calibration method is described which applies the same or different models multiple times until the most distortions have been eliminated.Finally,combining the free network adjustment and the iterative method,camera calibration tests are carried out while no ground control points are available.Two non-metric cameras are tested and the results obtained using the traditional calibration method and iterative calibration method are analyzed.The experimental results show that the proposed camera iterative calibration method can further improve the camera calibration accuracy comparing to the traditional calibration method.

Key words: photogrammetry, camera calibration, distortion calibration, iterative processing, calibration field

CLC Number:

CUI Cancan, WANG Jiali, MA Zhenling. The Iterative Method of Camera Calibration[J]. 测绘通报, 2018, 0(6): 50-54,60.

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