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Trajectory-estimation apparatus and method based on pen-type optical mouse

  • US 8,928,631 B2
  • Filed: 06/09/2008
  • Issued: 01/06/2015
  • Est. Priority Date: 07/27/2007
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • an optical input device which includes an optical sensor having an optical margin which is a distance from a work surface in which the optical sensor is able to recognize movement of the optical input device, the optical input device movable over a total time, during which the optical input device is not in contact with the work surface, from a first position in which the optical input device is in contact with the work surface to a second position in which the optical input device is in contact with the work surface, the total time includinga first time period extending from a moment that the optical input device becomes no longer in contact with the work surface from being in the first position to a moment a distance between the optical input device and the work surface exceeds the optical margin,a second time period extending from the moment the distance between the optical input device and the work surface exceeds the optical margin to a moment the optical input device becomes within the optical margin, anda third time period from the moment the optical input device becomes within the optical margin to a moment the optical input device comes in contact with the work surface to thereby be in the second position; and

    a computer processor that calculates an offset by multiplying an average moving speed of the optical input device over the total time by the amount of time of the second time period, and calculates corrected coordinates of the second position by adding the offset to start coordinates of the second position.

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