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Printed interface with orientation target structure

  • US 7,530,501 B2
  • Filed: 04/18/2007
  • Issued: 05/12/2009
  • Est. Priority Date: 05/25/1999
  • Status: Expired due to Fees
First Claim
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1. A printed interface for user interaction with a computer system via a sensing device, the interface comprising:

  • visible graphical information; and

    ,coded data readable by the sensing device, the coded data comprising a plurality of substantially undifferentiated marks positioned relative to a predetermined pattern, with an orientation target structure for allowing relative rotation of the predetermined pattern to be determined, each mark being circular and having a minimum radius and a maximum radius, the minimum radius being more than 40% of the maximum radius;

    wherein,the visible graphical information indicates a user selectable operation which is transmitted to the computer system by reading the coded data with the sensing device.

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