Multiple transform utilization and application for secure digital watermarking
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United States of America Patent
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Jun 15, 2010
Grant Date -
Jun 29, 2006
app pub date -
Feb 21, 2006
filing date -
Apr 2, 1998
priority date (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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