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System for user interaction with a computer system

  • US 7,931,208 B2
  • Filed: 05/23/2010
  • Issued: 04/26/2011
  • Est. Priority Date: 05/25/1999
  • Status: Expired due to Fees
First Claim
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1. A system for user interaction with a computer system, the system comprising:

  • a printed surface having visible graphical information indicating a user selectable operation, and coded data, the coded data comprising a plurality of marks positioned relative to a predetermined pattern, the predetermined pattern having a rotationally invariant structure and an orientation target structure;

    an optical sensing device for capturing images of the coded data; and

    processor for determining relative rotation of the coded data from the images.

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