Optical tracking sensor method
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United States of America Patent
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Jun 6, 2006
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app pub date -
Jul 29, 2004
filing date -
Jul 29, 2004
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Abstract
The present invention is a method of optical tracking sensing using block matching to determine relative motion. The method includes three distinct means of compensating for non-uniform illumination: (1) a one-time calibration technique, (2) a real-time adaptive calibration technique, and (3) several alternative filtering methods. The system also includes a means of generating a prediction of the displacement of the sampled frame as compared to the reference frame. Finally, the method includes three cumulative checks to ensure that the correlation of the measured displacement vectors is good: (1) ensuring that 'runner-up' matches are near the best match, (2) confirming that the predicted displacement is close to the measured displacement, and (3) block matching with a second reference frame.
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