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Interface surface for user interaction with a computer system via a sensing device

  • US 7,213,756 B2
  • Filed: 07/27/2005
  • Issued: 05/08/2007
  • Est. Priority Date: 05/25/1999
  • Status: Expired due to Fees
First Claim
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1. An interface surface for user interaction with a computer system via a sensing device, the interface comprising:

  • visible graphical information; and

    ,substantially invisible coded data readable by the sensing device, the coded data comprising a plurality of substantially undifferentiated marks positioned relative to a predetermined pattern with a target structure extending radially outwardly from a centre of the pattern for allowing relative rotation of the predetermined pattern to be determined;

    wherein,the visible graphical information indicates an operation that the user can select and transmit to the computer system by reading the coded data with the sensing device.

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