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Detection of watermarks in signals

A signal and watermarking technology, applied in image watermarking, recording signal processing, information storage, etc., to achieve the effect of saving transmission bandwidth and reliable watermark detection

Inactive Publication Date: 2013-07-10
IRDETO ACCESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, a single output modification tool created by an attacker can be easily re-used to break the watermark in the output of many sinks

Method used

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  • Detection of watermarks in signals
  • Detection of watermarks in signals
  • Detection of watermarks in signals

Examples

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Embodiment Construction

[0041] The present invention provides a watermark detection device that works independently of substantially any watermark algorithm used in the watermark insertion device. Since a generic watermark detection device supports essentially any watermark algorithm, it is able to handle dynamic changes in the used watermark algorithm and / or watermark insertion device while still achieving reliable watermark detection without any modification or loss of detection sensitivity.

[0042] The watermark detection means supports watermarking algorithms in which the receiver input produces an implementation-specific watermarked content output, for example when based on an error concealment algorithm in the decoder or an error handler of the receiver.

[0043] The watermark detection means identifies the watermarked message in the watermarked content output input to the receiver of the detection means. The input to the detection means is eg the analog TV output of the receiver, in which the...

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Abstract

The invention provides for a method and a device for the detection of a watermark in a signal. A first signal is compared with two or more second signals. The second signal with the closest match contains the same watermark as in the first signal. Data indicative for the second signal with the closest match is output as an indication of the watermark in the first signal. The invention further provides for a head-end system that provides watermarked content from which the watermarks are detectable by the watermark detection device.

Description

technical field [0001] The present invention relates to a watermark detection device and a head-end system for generating detectable watermarked content. Background technique [0002] Watermarking belongs to the technical field of steganography, which deals with the concealment of information signals in watermarked content to render them substantially unobservable by human observers. Content is, for example, a data file or a data stream. The watermark information is essentially irremovable and unaffected by manipulation of analog signals, such as audio and / or video signals, decoded from the content. Typically, watermarks are used to track files or streams distributed via unauthorized distribution networks. [0003] A data stream typically includes one or more content streams, such as for example audio and / or video streams or digital TV streams. Typically, the watermark is inserted into the content stream at the sender so that it is detectable in the analog domain after de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00H04N5/913H04L29/06
CPCG06T1/005G06T2201/0065G11B20/00086H04L9/14H04L63/04H04L63/0428H04L63/06H04L2209/608H04N5/913H04N21/44008H04N21/8358H04N2005/91335H04N2005/91364
Inventor E·韦斯特维尔特
Owner IRDETO ACCESS
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