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Navigation device and image display system with inertial mode

  • US 9,727,148 B2
  • Filed: 12/24/2013
  • Issued: 08/08/2017
  • Est. Priority Date: 12/24/2013
  • Status: Active Grant
First Claim
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1. A navigation device, configured to be placed on a work surface in operation, the navigation device comprising:

  • an image sensor configured to successively capture light reflected from the work surface to output image frames;

    a processing unit configured to calculate displacements of the navigation device with respect to the work surface according to the image frames;

    an output interface configured to output the displacements at a report rate; and

    an inertial unit configured toanalyze a plurality of calculated displacements within a predetermined period and an inertial period which is subsequent to the predetermined period, andprovide an inertial displacement in the inertial period to control a cursor within the inertial period during which the calculated displacement is zero when at least one of the calculated displacements within the predetermined period is larger than a threshold and the calculated displacements decrease to zero within the predetermined period and maintain zero to the inertial period,whereinthe cursor, within the predetermined period, is controlled by the displacements calculated by the processing unit without being controlled by the inertial displacement provided by the inertial unit.

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