Record carrier with watermark

Details Record carrier with watermark Record carrier with watermark

2007-08-28

2007-08-28

Bella, Matthew C. (Department: 2624)

Image analysis

Applications

C369S275100

Reexamination Certificate

active

10169922

ABSTRACT:
A record carrier includes a pattern of substantially parallel tracks for storing data in the form of marks, in which the data is encoded by a channel code. A watermark is provided by controlling the parameter of the channel code so as to introduce a predetermined run length distribution in the marks on the record carrier. Brightness differences are caused by introducing this run length distribution.

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