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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Wang Hua Han Liqiang Zhang Shuang |
| Copyright Year | 2009 |
| Description | Author affiliation: College of Mechanical Science and Engineering, Changchun Institute of Technology, Jilin Provice, China (Wang Hua; Han Liqiang; Zhang Shuang) |
| Abstract | For online accurate holes detection of the auto rack girders, this paper proposes a method of combination non-linear distortion correction and double-linear transformation, to calibrate internal parameters and correct geometric parameters. Firstly, in different angles, through 20 grabbing calibration templates images, carrying on non-linear distortion correction for grabbing images with Zhang Zhengyou calibration algorithm, to gain internal radial and tangent direction distortion parameters. Through experiment data, we find internal parameters want to tend to be stable only through more than 12 calibration templates images; secondly, after canceling lens distortion, because included angle exists between imaging plane of camera and under-detecting plane the auto rack girders, circular hole may become elliptical after grabbing images. So we images are carried on a double-linear transformation again, which have been carried with non-linear transformation, namely let imaging plane of camera becomes parallel to the auto rack girder plane. Then at this point, calculation of image may draw near true value of measurement. In this paper, we discussed the possible deviation when camera calibrates. Experimental results indicate calibration algorithm is practicable for holes on the auto rack girders, which is about combination non-linear distortion correction and double-linear transformation, its calibration accuracy is 0.41 pixels. |
| Starting Page | 3369 |
| Ending Page | 3374 |
| File Size | 1738236 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781424426928 |
| DOI | 10.1109/ICMA.2009.5246329 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-08-09 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Cameras Calibration Structural beams Nonlinear distortion Lenses Optical imaging Optical distortion Production facilities Machine vision Manufacturing calibration distortion the auto rack girders non-linear double-linear |
| Content Type | Text |
| Resource Type | Article |
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