Methods for encoding data in an analog video signal such...

Details Methods for encoding data in an analog video signal such... Methods for encoding data in an analog video signal such...

2007-01-23

2007-01-23

Kostak, Victor R. (Department: 2622)

Television

Format

Including additional information

C348S553000

Reexamination Certificate

active

10773944

ABSTRACT:
VEIL modulation is a method of “subliminal” encoding of data in a video image that is similar to a watermark. The encoding consists of alternately proportionately raised and lowered luminance on selected horizontal scan lines. The encoding can be detected using a notch filter centered at half the line frequency. The encoding is lost, however, if the resolution of the video signal is changed downward. The invention preserves the encoding by coding alternate groups of lines, not alternate lines. This allows detection with a notch filter even after a reduction in resolution.

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International Search Report dated Dec. 13, 2004; corresponding PCT/US04/03619 filed Feb. 6, 2004; Publication No. WO 2004/073168 A3 published on Aug. 26, 2004; Applicant: Warner Bros. Entertainment Inc.; Inventors: CJ Cookson, S Stephens, CR Odgers.

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