Multiple transform utilization and applications for secure digital watermarking
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United States of America Patent
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Issued Date -
Jul 26, 2001
app pub date -
Jan 24, 2001
filing date -
Apr 2, 1998
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Multiple transform utilization and applications for secure digital watermarking. In one embodiment of the present invention, digital blocks in digital information to be protected are transformed into the frequency domain using a fast Fourier transform. A plurality of frequencies and associated amplitudes are identified for each of the transformed digital blocks and a subset of the identified amplitudes is selected for each of the digital blocks using a primary mask from a key. Message information is selected from a message using a transformation table generated with a convolution mask. The chosen message information is encoded into each of the transformed digital blocks by altering the selected amplitudes based on the selected message information.
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