On Tuesdays the USPTO issues new patents. Both of today's Spotlight Patents concern various aspects of digital watermarking. Assigned to Philips, the first patent concerns techniques for time domain watermarking of multimedia signals. Assigned to Canon, the second patent concerns techniques for digital watermark embedding/ extraction in accordance with manipulation, editing, and compression.
7,546,467, "Time domain watermarking of multimedia signals," assigned to Philips (NL).
A method of generating a watermark signal, embedding the watermark signal within a multimedia signal, and subsequently detecting the watermark signal is described. The watermark signal is the sum of two sequences of values, the second sequence of values being a circularly shifted version of the first sequence.
7,548,633, "Data processing apparatus and method, data processing program, and storage medium," assigned to Canon (JP).
The present invention has an object to provide a data processing apparatus which can perform digital watermark embedding/extraction in accordance with manipulation, editing, and compression. To achieve the object, the data processing apparatus for performing compression processing on digital data comprises: a digital watermark extracting device extracting additional information, embedded as a digital watermark, from digital data; a digital watermark removing device removing the additional information, embedded as a digital watermark, from the digital data; an irreversible processing deice performing irreversible processing on the digital data; and a digital watermark embedding device embedding the additional information as a digital watermark in the irreversible-processed digital data.