NDLI: Planar Visual Metrology using Partition-based Camera Calibration

Content Provider	IEEE Xplore Digital Library
Author	Liang Dongtai Wang Xuanyin
Copyright Year	2008
Description	Author affiliation: State Key Lab. of Fluid Power Transm. & Control, Zhejiang Univ., Hangzhou (Liang Dongtai; Wang Xuanyin)
Abstract	In visual metrology the real imaging procedure is a complicate nonlinear system. Even after rectification of the radial distortion of the lens, it is hard to achieve high accuracy with single group of planar extrinsic parameters. According to the characteristics of the radial distortion of lens, a partition-based camera extrinsic calibration method for planar visual measurement is proposed. The image plane is partitioned into 9 subspaces according to the lens radial distortion, and in each subspace one group of extrinsic parameters of objects plane is calibrated separately. Although there is only one objects plane where the visual measurement is to be done, the groups of extrinsic parameters calibrated in each subspace are different because of the nonlinear in real system. In the subspace that the image points belong to, the corresponding group of extrinsic parameters of the subspace is adopted to reconstruct the 3D positions of the objects in the camera coordinate system. Finally experimental results show that the partition-based calibration method performs well in visual metrology. Compared with the method which uses single group of extrinsic parameters the proposed method can achieve higher accuracy in measuring distance of planar objects from their perspective images.
Starting Page	205
Ending Page	209
File Size	8033338
Page Count	5
File Format	PDF
ISBN	9781424416752
DOI	10.1109/RAMECH.2008.4681413
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-21
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Metrology Cameras Calibration Lenses Nonlinear distortion Distortion measurement Robot vision systems Laboratories Power transmission Nonlinear control systems partition-based subspaces visual metrology camera calibration
Content Type	Text
Resource Type	Article

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