Multiple transform utilization and application for secure digital watermarking
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United States of America Patent
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Nov 17, 2015
Grant Date -
Aug 14, 2014
app pub date -
Apr 22, 2014
filing date -
Jan 17, 1996
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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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