[1]LI Yinguo,CHENG Cheng.Distortion correction method for cameras with wide-angle lens based on nonlinear spline interpolation[J].CAAI Transactions on Intelligent Systems,2020,15(6):1033-1039.[doi:10.11992/tis.201812022]
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Distortion correction method for cameras with wide-angle lens based on nonlinear spline interpolation

CAAI Transactions on Intelligent Systems[ISSN 1673-4785/CN 23-1538/TP] Volume: 15 Number of periods: 2020 6 Page number: 1033-1039 Column: 学术论文—智能系统 Public date: 2020-11-05
Title:
Distortion correction method for cameras with wide-angle lens based on nonlinear spline interpolation
Author(s):
LI Yinguo;  CHENG Cheng
Center for Automotive Electronics and Embedded System, College of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Keywords:
wide-angle camera distortion; complex distortion; detection of growth; camera calibration; distortion correction; surface fitting; thin-plate spline interpolation; Biharmonic interpolation
CLC:
TP391
DOI:
10.11992/tis.201812022
Abstract:
Chessboard detection and corner extraction are imperative during the camera calibration process, which is a fundamental work in computer vision. The existing chessboard detection algorithm can only detect the standard chessboard and the chessboard matching and has distortion problems. Here, detection part based on the growth method is improved to generate a non-regular chessboard, so as to increase the data of chessboard points. Aiming to improve the accuracy of distortion correction of wide-angle lens (cameras) in the wide-angle direction and complex distortion of glasses, we propose a new nonlinear method that uses the interpolation of thin-plate spline interpolation and biharmonic equation to solve the distortion problems. In this method, scattered data points are controlled to approach the desired target values of data point, and thereby, the mapping surface is fitted to correct distortion. Experimental results show that the method is feasible and robust, improving the correction accuracy of complex distortion and wide-angle distortion in wide-angle cameras.
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