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Method for determining motion using a velocity predictor

  • US 20070165207A1
  • Filed: 01/03/2006
  • Published: 07/19/2007
  • Est. Priority Date: 01/03/2006
  • Status: Active Grant
First Claim
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1. A method for detecting movement of a surface relative to an optical sensor having an array of photosensitive elements, the method comprising steps of:

  • generating at least one set of quasi-sinusoidal signals responsive to motion of light received on the array in at least a first direction;

    combining said at least one set of quasi-sinusoidal signals to generate a phase angle value for said first direction at a first time;

    combining said at least one set of quasi-sinusoidal signals at a second time to generate a phase angle value for said first direction at the second time;

    computing wrapped phase angle changes for said first direction;

    computing the unwrapped phase angle changes for said first direction; and

    determining a value of distance moved in the first direction.

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