Steganographic encoding and decoding of auxiliary codes in media signals
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United States of America Patent
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Jun 19, 2012
Grant Date -
Mar 23, 2006
app pub date -
Sep 13, 2005
filing date -
Nov 18, 1993
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Abstract
Methods of steganographically encoding auxiliary data into audio and decoding the auxiliary data. In an encoding method, a processor maps the auxiliary data to samples in the audio data. A processor modifies the mapping of the auxiliary data to the samples over time. A processor modifies a feature of the samples of the audio data to which the code signals are mapped to convey the auxiliary data substantially imperceptibly in the audio data. In a decoding method, a processor performs decoding of a multibit auxiliary code embedded in an audio signal. A processor decodes code values of the auxiliary code from two or more different portions of the audio signal, each having the multibit auxiliary code. A processor combines the code values decoded from the two or more different portions of the audio signal to determine the code values of the auxiliary code.
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