Advanced multi-channel watermarking system and method
View Patent ↗A method, computer program product, and computing device for modifying a first channel portion of a digital media data file to include at least a first primary watermark. A second channel portion of the digital media data file is modified to include at least a first secondary watermark, wherein the first secondary watermark is the complement of the first primary watermark.
1. A method of extracting a watermark comprising:
obtaining a digital media data file that comprises a first channel portion and a second channel portion;
extracting at least a primary watermark from the first channel portion and at least a secondary watermark from the second channel portion, wherein the secondary watermark originally embedded in the second channel portion is a complement of the primary watermark originally embedded in the first channel portion;
determining a difference signal by destructive interference between the first channel portion and the second channel portion, whereby the relative strength of the primary watermark with the complementary secondary watermark is enhanced, relative to considering the primary watermark alone; and
verifying authenticity and/or integrity of both the first channel portion and the second channel portion of the digital media data file using, individually and collectively, the primary watermark, the complementary secondary watermark, and the difference signal.
2. The method of claim 1 wherein the first channel portion of the digital media data file comprises:
a left audio channel or a right audio channel.
3. The method of claim 1 wherein the second channel portion of the digital media data file comprises:
a right audio channel or a left audio channel.
4. The method of claim 1 wherein the verifying of the digital media data file further comprises:
verifying the extracted secondary watermark is a complement of the extracted primary watermark and that the determined difference signal is substantially zero; and
determining, based at least in part on the verifying of the secondary watermark and the verifying of the determined difference signal that the digital media data file was properly transmitted.
5. The method of claim 1 wherein the verifying of the digital media data file further comprises:
verifying the extracted secondary watermark is not a complement of the extracted primary watermark and that the determined difference signal is substantially non-zero; and
determining, based at least in part on the verifying of the secondary watermark and the verifying of the determined difference signal that the digital media data file was improperly transmitted.