Watermark generator, watermark decoder, and method for providing binary message data

US8726031B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Stefan Wabnik · Ilmenau, DE
• Reinhard Zitzmann · Effeltrich, DE
• Tobias Bliem · Erlangen, DE
• Bert Greevenbosch · Rotterdam, NL
• Bernhard Grill · Lautenbächle, DE
• Ernst Eberlein · Erlangen, DE
• Giovanni Del Galdo · Martinroda, DE
• Marco Breiling · Berlin, DE
• Stefan Kraegeloh · Erlangen, DE
• Juliane Borsum · Erlangen, DE
• Joerg Pickel · Happurg, DE

Key dates

• Filing date: Aug 23, 2012
• Grant date: May 13, 2014
• Expiry date: Aug 23, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F21/1063
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A watermark generator for providing a watermark signal in dependence on binary message data, the watermark generator has an information spreader configured to spread an information unit to a plurality of time-frequency-domain values, to obtain a spread information representation. The watermark generator also has a synchronization inserter configured to multiplicatively combine the spread information representation with a synchronization sequence to obtain a combined information-synchronization representation. The watermark generator also has a watermark signal provider configured to provide the watermark signal on the basis of the combined information-synchronization representation. A watermark decoder, methods and computer programs are also described.