| 摘要 |
Embodiments of the present invention provide a method that includes moving a handheld device over a print medium, depositing a tagging substance with the handheld device in a tagging pattern on the print medium, further moving the handheld device over the print medium such that at least one sensor of the handheld device senses at least part of the tagging pattern, and determining at least one of a position and/or a velocity of the handheld device based upon the sensing at least part of the tagging pattern. The tagging pattern is configured to provide absolute position information.
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