The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2009
Filed:
Nov. 24, 2004
Minne Van Der Veen, Eindhoven, NL;
Aweke Negash Lemma, Eindhoven, NL;
Minne Van Der Veen, Eindhoven, NL;
Aweke Negash Lemma, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention relates to a system for detecting a watermark using informed detection. A first signal potentially having a watermark embedded is received () as is a second signal corresponding to the original signal. The signals are segmented () into symbol segments. For each symbol segment a first characteristic is determined () for a first section and a second characteristic is determined () for a second section in response to the first and second signals in those sections. Specifically, ratios between average envelopes are determined. Thus, the first and second characteristic is indicative of the variations of the envelope during a watermark symbol. A watermark symbol estimate is determined () from the first and second characteristic. A sequence of estimated watermark symbols is compared to reference watermark symbols and the presence of a watermark symbol is determined () depending on the comparison. The invention is particularly suitable for improved detection of a multiplicative watermark.