Method and arrangement for detecting multiple watermarks in information signal

Given multimedia content with two (possibly different types of) watermarks, the naive way of retrieving both messages is to apply the two detectors independently. In case that geometry retrieval (e.g. undoing scaling) is an integral part of watermark detection, this implies that geometry retrieval i...

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Bibliographische Detailangaben
Hauptverfasser:	A.A.C.M. KALKER, M.J.J.J.-B. MAES
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING CALCULATING CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY COMPUTING COUNTING CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMAGE DATA PROCESSING OR GENERATION, IN GENERAL PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION SEALS
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Beschreibung
Zusammenfassung:	Given multimedia content with two (possibly different types of) watermarks, the naive way of retrieving both messages is to apply the two detectors independently. In case that geometry retrieval (e.g. undoing scaling) is an integral part of watermark detection, this implies that geometry retrieval is duplicated in both detections. In particular, the combined detection may be unnecessarily complex. The invention provides a solution for this problem. A first watermark detector makes the geometry retrieval parameters available to the second watermark detector, thereby reducing the complexity of the combined detection.