Global metadata embedding and decoding

Details Global metadata embedding and decoding Global metadata embedding and decoding

2005-04-22

2008-09-02

Lu, Kuen S. (Department: 2162)

Data processing: database and file management or data structures

Database design

Data structure types

C235S494000, C235S472030, C235S462490

Reexamination Certificate

active

07421439

ABSTRACT:
Global metadata, such as a document identifier, which may be a globally unique identifier, is embedded into an embedded interactive code document by combining a first m-array and a plurality of copies of the first m-array to generate a combined m-array with encoded global metadata such that respective start positions (xd,yd)iof the plurality of copies of the first m-array in the combined m-array are each shifted, by respective amounts that are based on respective portions of the global metadata, relative to a start position of the first m-array in the combined m-array. Global metadata may be decoded from the combined m-array by determining the respective amounts by which the plurality of copies of the first m-array are shifted, relative to the first m-array, in the combined m-array and by combining the respective amounts to produce a decoded value of the global metadata.

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Douglas W. Clark and Lih-Jyh Weng, “Maximal and Near-Maximal Shift Register Sequences: Efficient Event Counters and Easy Discrete Logarithms,” IEEE Transactions on Computers 43.5 (May 1994, pp. 560-568).

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