Patent · US Active

Method and apparatus for determining whether or not a reference pattern is present in a received and possibly watermarked signal

US8281137B2 · kind B2 · utility

0Cited by

2References

7Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Peter Georg Baum · Hannover, DE
Michael Arnold · Altwarmbüchen, DE
Ulrich Gries · Hamburg, DE
Walter Voessing · Hannover, DE

Key dates

Filing date	Jan 15, 2009
Grant date	Oct 2, 2012
Priority date	—
Expiry date	Aug 5, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG06T2201/0065
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Many watermarking systems make use of correlation for calculating a detection metric, which means that several reference patterns are generated at encoder side and one or more of them are embedded inside the content signal, dependent on the message to be embedded. To decode the embedded message, it is necessary to discover which reference pattern was embedded at encoder side by correlating the known reference patterns with the content signal. In the case where watermarked audio is emitted by a loudspeaker and then captured with a microphone, the received signal echoes are used for watermark detection instead of treating them as noise by integrating the correlation values resulting from echoes into the main correlation peak, thereby using correlation result amplitude values located within a predetermined neighborhood of a correlation result peak amplitude value and exceeding a predetermined threshold.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.