Image marking with error correction
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United States of America Patent
Stats
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Nov 13, 2001
Issued Date -
N/A
app pub date -
Nov 3, 1999
filing date -
Jul 31, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of marking a work of authorship without apparent evidence of data alteration. The work (e.g., an image) is represented by a set of data elements (e.g., pixels). The marking includes providing first plural-bit data, and computing therefrom additional, error correcting data. This composite set of data is used in image marking, permitting at least certain errors to be discerned and corrected when the marking is later discerned from the image.
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