Geometric Calibration of IR Camera Using Trinocular Vision

Geometric Calibration of IR Camera Using Trinocular Vision
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三目视觉红外相机的几何标定

DOI:
10.1109/jlt.2011.2170812
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发表时间:
2011-10
影响因子:
4.7
通讯作者:
Wu, Xiaoming
Wu, Xiaoming
中科院分区:
工程技术2区
文献类型:
--
作者:
Yang, Rongqian;Yang, Wei;Chen, Yazhu;Wu, Xiaoming

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一个三维(3-D)的热谱图可以提供空间信息,但是,它很少被应用,因为它缺乏一个准确的方法来获得的内部和外部参数的红外(IR)相机。常规方法不能用于这种校准,因为IR相机不能捕获可见的校准图案。因此,在本研究中,一个由两个可见光摄像机和一个红外摄像机组成的三目视觉系统和一个微型灯泡的校准板的设计。两台可见光摄像机组成双目视觉系统,获取微型灯泡的三维信息,红外摄像机捕获标定板,获取微型灯泡的二维亚像素坐标。提出了相应的算法,根据采集到的信息对红外摄像机进行标定。实验结果表明,该标定方法能够准确地获得红外相机的内外参数,满足实际应用的要求。
A three-dimensional (3-D) thermogram can provide spatial information; however, it is rarely applied because it lacks an accurate method in obtaining the intrinsic and extrinsic parameters of an infrared (IR) camera. Conventional methods cannot be used for such calibration because an IR camera cannot capture visible calibration patterns. Therefore, in the current study, a trinocular vision system composed of two visible cameras and an IR camera is constructed and a calibration board with miniature bulbs is designed. The two visible cameras compose a binocular vision system that obtains 3-D information from the miniature bulbs while the IR camera captures the calibration board to obtain the two dimensional subpixel coordinates of miniature bulbs. The corresponding algorithm is proposed to calibrate the IR camera based on the gathered information. Experimental results show that the proposed calibration can accurately obtain the intrinsic and extrinsic parameters of the IR camera, and meet the requirements of its application.
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