New patents are issued by the USPTO on Tuesdays. Both of today's Spotlight Patents concern aspects of digital watermarking. Assigned to Digimarc, the first patent addresses techniques for watermarking and signal recognition for managing and sharing captured content, metadata discovery and related arrangements. Assigned to Fundacio per a la Universitat Oberta de Catalunya (ES), the second patent addresses techniques for audio watermarking in which watermark data is codified in a plurality of Fourier transform coefficients of the audio signal.
9,979,691, "Watermarking and signal recognition for managing and sharing captured content, metadata discovery and related arrangements," assigned to Digimarc.
Content is identified using watermarking and/or other content recognition combined with contextual metadata, which facilitates identification and correlation with other content and metadata when it is posted to a network.
9,978,382, "Method and apparatus for embedding and extracting watermark data in an audio signal," assigned to Fundacio per a la Universitat Oberta de Catalunya (ES).
Methods and apparatus for audio watermarking are disclosed in which watermark data is codified in a plurality of Fourier transform coefficients of the audio signal. The watermarked audio is transmitted and captured as sound waves after analogic conversion, typically through a medium with some degree of signal degradation. The receiving end converts the watermarked audio back to the digital domain before extracting the watermark data from the Fourier transform coefficients. This configuration is enhanced in certain embodiments by a robust bit codification technique with fast decoding algorithms, synchronization signalling and error correction.