Process for decoding coded data
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United States of America Patent
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Apr 23, 2013
Grant Date -
May 17, 2012
app pub date -
Jan 24, 2012
filing date -
Oct 25, 2002
priority date (Note) -
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Abstract
A process for decoding coded data is provided. The coded data has a plurality of layouts which each have order n (at least two) rotational symmetry and encode a codeword of a sequence of n symbols distributed at n locations about a center of rotational symmetry of the respective layout such that decoding the symbols at each of the n orientations of the layout produces n representations of the codeword. Each representation is a different cyclic shift of the codeword and is indicative of the degree of rotation of the layout. The process involves, at the computer system, identifying a layout from an image including the coded data, decoding the identified layout to determine a codeword representation, and determining a degree of rotation of the layout from the determined representation.
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