Watermark embedding and detection

Details Watermark embedding and detection Watermark embedding and detection

2006-10-24

2006-10-24

Sheikh, Ayaz (Department: 2131)

Cryptography

Video cryptography

Copy protection or prevention

C382S170000, C382S100000

Reexamination Certificate

active

07127065

ABSTRACT:
In a method and arrangement for embedding and detecting a watermark in an information signal, the embedded watermark (Wi) is selected (13) from a plurality of watermarks (W1. . . WN) in dependence upon a property P of the signal. An example of such a property is the distribution of luminance values of the current video image as calculated by an analysis circuit (12). The corresponding watermark detector performs the same operation: the watermark being looked for depends on the same signal property. It is achieved with the invention that the embedded watermark changes from time to time as a function of the information signal content, so that it cannot easily be hacked.

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“Applications of Digital Wartermarking Technology in Audio Signals” by Changsheng Xu et al., in J. Audio Eng. Soc., vol. 47, No. 10, Oct. 1999, pp. 805-812.

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