Abstract
Near infrared optical tracking system (NIOTS) is widely
used in biomedical application, especially in surgical navigation. It largely
determines the accuracy of tracking surgical tools. So we design an NIOTS
and propose the corresponding algorithms to make it work well. Two near infrared
cameras (NICs) are constructed in this NIOTS and a near infrared calibration
board is designed to calibrate them. The NIOTS is then calibrated using the
calibration results of NICs. After the image points of markers on surgical
tools are obtained, a two-step stereo matching algorithm is proposed to match
the subpixel points in the left and right images. Then the three dimensional
coordinates of markers are computed and the surgical tools are tracked in
real time. The experimental results show the accuracy of system calibration,
stereo matching, and tracking. The average tracking errors of three markers
in 150 positions are 0.0090 mm, 0.0071 mm, and 0.0060 mm, which demonstrate
the designed NIOTS can accurately track surgical tools.
© 2012 IEEE
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