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Distinguishing tilt and translation motion components in handheld devices

  • US 7,301,528 B2
  • Filed: 03/23/2004
  • Issued: 11/27/2007
  • Est. Priority Date: 03/23/2004
  • Status: Active Grant
First Claim
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1. A motion controlled handheld device comprising:

  • a first accelerometer operable to detect acceleration along a first axis;

    a second accelerometer operable to detect acceleration along a second axis, the second axis perpendicular to the first axis;

    a tilt detection component operable to detect rotation having a component around at least one of the first axis and the second axis, wherein the tilt detection component comprises;

    a first camera operable to generate a first video stream, the first camera aligned to focus in a first direction along a third axis, the third axis perpendicular to the first axis and perpendicular to the second axis;

    a second camera operable to generate a second video stream, the second camera aligned to focus in a second direction along the third axis, the second direction opposite the first direction; and

    a video analysis module operable to detect a direction of motion of the device based at least on the first video stream;

    a display operable to present a current image;

    a motion tracking module operable to track motion of the device in three dimensions using the first accelerometer, the second accelerometer, and the tilt detection component; and

    a controller operable to generate the current image and to modify the current image in response to the motion of the device.

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