Thursdays the Patent Office publishes new pending patent applications. Both of today's Spotlight Applications concern aspects of digital watermarking. Assigned to Infosys (IN), the first application discloses techniques for performing transcoding resistant watermarking. Assigned to Verance, the second application discloses techniques for coordinated watermarking.
20130156255, "Method and system for performing transcoding resistant watermarking," assigned to Infosys Limited (IN).
A method for performing transcoding resistant watermarking of digital media content is provided. The method enables obtaining a plurality of spectral frequency bands of the digital media content. The method further enables calculating an entropy value for each of the plurality of spectral frequency bands. The entropy value quantifies information in each of the plurality of spectral frequency bands. The method further enables selecting a spectral frequency band from amongst the plurality of spectral frequency bands based on the calculation. The selected spectral frequency band has the highest entropy. Furthermore, the method enables inserting a watermark in the selected spectral frequency band of the digital media content.
20130152210, "Coordinated watermarking," assigned to Verance.
Methods, devices and computer program products enable embedding and extraction of multiple watermark messages in a coordinated fashion to improve watermark transparency, robustness against impairments, security, and computational complexity of embedding and extraction of watermarks. Coordinated watermark embedding and extraction operations take advantage of a pre-defined relationship between the symbols of two watermark messages. The improved aspects of the watermarking system provide significant value to content owners, content distributors, and consumers at a small incremental cost.