Abstract
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.
© 2011 IEEE
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