Camera calibration method with focus-related intrinsic parameters based on the thin-lens model

Optics Express
Zhangji Lu, Lilong Cai

Abstract

In this paper, a calibration method for a camera with focus-related intrinsic parameters based on the thin-lens model is proposed to realize highly accurate measurement for small objects with extended depth of field (DOF). It mainly solves inaccurate calibration and small DOF problems at high magnification of vision systems. The mathematical camera model, initial camera calibration based on the iterative radial alignment constraint (IRAC) and optimization strategy are presented. The effectiveness, accuracy and practicality of the proposed calibration method are verified by both simulations and experiments. The root mean square errors of measured points in the 3D world coordinates with the proposed calibration method decrease from 22.02 μm to 1.66 μm when the magnification of the vision system increases from 0.12× to 0.66×. With the proposed calibration method based on the thin-lens model, accurate measurement, extended DOF and low calibration workload can be achieved.

References

Nov 17, 2006·IEEE Transactions on Pattern Analysis and Machine Intelligence·Xianghua Ying, Hongbin Zha
Feb 13, 2008·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·M Bertozzi, A Broggi
Mar 31, 2011·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Niranjan D Narvekar, Lina J Karam
Jan 17, 2013·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Shuhan Shen
Sep 15, 2015·Optics Express·Yuzhen HongEnhai Liu
Aug 10, 2017·Optics Express·Zhen LiuXiao Pan
Jul 12, 2018·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Luo JiangLigang Liu
Feb 9, 2019·Optics Express·Zhangji Lu, Lilong Cai

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