Calibration techniques for object tracking using a compound eye image sensor

Details Calibration techniques for object tracking using a compound eye image sensor Calibration techniques for object tracking using a compound eye image sensor

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5611...42k&link_type=abstract

Unmanned/Unattended Sensors and Sensor Networks. Edited by Carapezza, Edward M. Proceedings of the SPIE, Volume 5611, pp. 42-

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Scientific paper

Vanishing point and Z-tranform image center calibration techniques are reported for a prototype "compound-eye" camera system which can contain up to 25 "eyelets". One application of this system is to track a fast-moving object, such as a tennis ball, over a wide field of view. Each eyelet comprises a coherent fiber bundle with a small imaging lens at one end. The other ends of the fiber bundles are aligned on a plane, which is re-imaged onto a commercial CMOS camera. The design and implementation of the Dragonfleye prototype is briefly described. Calibration of the image centers of the eyelet lenses is performed using a vanishing point technique, achieving an error of approximately +/-0.2 pixels. An alternative technique, the Z-transform, is shown to be able to achieve similar results. By restricting the application to a two-dimensional surface, it is shown that similar accuracies can be achieved using a simple homography transformation without the need for calibrating individual eyelets. Preliminary results for object tracking between eyelets are presented, showing an error between actual and measured positions of around 3.5 mrad.

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