×

Region delimited coded data having unique length digital signature

  • US 7,793,854 B2
  • Filed: 11/25/2008
  • Issued: 09/14/2010
  • Est. Priority Date: 05/18/2004
  • Status: Expired due to Fees
First Claim
Patent Images

1. Coded data for disposal on or in a surface, the coded data being delimited into a number of regions, the coded data encoding:

  • an identity of the region in which the coded data is disposed; and

    a signature formed from at least part of the identity of the region and a substantially random number, whereinthe coded data is arranged in accordance with a layout having n-fold rotational symmetry, where n is at least two, the layout including n sub-layouts rotated 1/n revolutions apart about a centre of rotation, at least one sub-layout including rotation-indicating data that distinguishes that sub-layout from other sub-layouts, andthe random number serves as a padding to pad out the identity to a length unique to the identity.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×