Field-based watermark insertion and detection

Details Field-based watermark insertion and detection Field-based watermark insertion and detection

1998-12-18

1999-11-23

Johns, Andrew W.

Image analysis

Applications

348473, G06K 900

Patent

active

059914262

ABSTRACT:
A digital watermark is inserted into multimedia data containing two image fields by placing a positive watermark into a first field and a negative watermark into a second field. The positive watermark and negative watermark are opposite of one another. The two fields can be interlaced fields of a field-based video signal or alternate rows of a frame-based video signal. The watermark is extracted from field-based watermarked data by separating the watermarked data into two fields and subtracting one of the fields from the other field to generate a watermarked signal. The resultant watermarked signal is processed in a conventional manner to extract and detect the watermark.

REFERENCES:
patent: 5184849 (1993-02-01), Taylor
patent: 5734752 (1998-03-01), Knox
patent: 5790703 (1998-08-01), Wang
Hsu et al., "Digital Watermarking for Video," IEEE Proc. 13th Int. Conf. on Digital Signal Processing, Jul. 2-4, 1997, pp. 217-220.
Hsu et al., "DCT-Based Watermarking for Video," IEEE Transactions on Consumer Electronics, vol. 44, No. 1, Feb. 1998, pp. 206-216.

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