Visual watermark in both data area and inner-ring of record...

Details Visual watermark in both data area and inner-ring of record... Visual watermark in both data area and inner-ring of record...

2005-01-21

2010-11-02

Tucker, Wesley (Department: 2624)

Image analysis

Applications

C382S232000, C382S240000, C369S275100, C369S275400, C369S059240, C369S059110, C713S176000

Reexamination Certificate

active

07826636

ABSTRACT:
A record carrier including a data area for storing data in the form of marks, in which the data is encoded by means of a channel code, wherein a parameter of the channel code is controlled so as to introduce a predetermined run length distribution in the marks on the record carrier, thereby introducing first information relating to a watermark, and a non-data area comprising second information relating to a watermark, the first and the second information forming the watermark. This watermark, extending over the data-area and the inner-ring area and/or the outer-ring area, can be used for checking the authenticity of the record carrier and/or the recordings made on this record carrier.

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