Steganography decoding methods employing error information
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United States of America Patent
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Nov 25, 2003
Grant Date -
Jul 4, 2002
app pub date -
Sep 25, 2001
filing date -
Nov 18, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Media content, such as imagery (including video) and audio, can be encoded to convey hidden information (steganographic encoding) for a variety of purposes, including communication of auxiliary information (e.g., copyright data), authentication, tamper detection, forensic tracking, etc. The reading (decoding) of the hidden information from the media content is complicated if the content has been corrupted in some manner. One example of corruption is the lossy compression/decompression associated with JPEG processing of digital imagery. In some cases, the corruption introduces errors in the decoding. In other cases, the corruption prevents the hidden information from being decoded at all. In accordance with a preferred embodiment of the invention, reliable decoding of steganographically encoded information is enhanced by processing the corrupted media content so as to counteract some of the corruption. In accordance with another embodiment, the reading proceeds from the corrupted media content, but the results are processed in accordance with the corruption to which the content has been subjected.
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