Embedding variable watermark information in halftone screens

Details Embedding variable watermark information in halftone screens Embedding variable watermark information in halftone screens

2005-01-26

2008-10-14

Azarian, Seyed (Department: 2624)

Image analysis

Applications

C382S172000, C358S003300

Reexamination Certificate

active

07436977

ABSTRACT:
Using correlated stochastic screens, time stamps, text messages, logos and other variable data can be incorporated into printed halftone images in real-time as invisible watermarks. A reference stochastic screen, which is suitable for halftoning the input image, is applied to the grayscale input in locations that lie outside of the watermark. A multi-partitioned watermark halftone screen, which has at least one partition with threshold values that are positively correlated (e.g., identical to) those of the reference stochastic screen and one partition with threshold values that are negatively correlated (e.g., conjugated with) those of the reference stochastic screen, is applied to the grayscale input in locations that are to incorporate the watermark.

REFERENCES:
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Wang, S. G. and Knox, K. T., “Embedding Digital Watermarks in Halftone Screens,” Proc. Electronic Imaging Conference, 2000; pp. 218-227.
Wang, S. G. and Knox, K. T., “Embedding Digital Watermarks in Halftone Screens,” Proc. Electronic Imaging Conference, 2000, pp. 218-227.
Wang, S. G. “Stoclustic (Stochastic Clustered) Halftone Screen Design,” Proc. NIP13: International Conference on Digital Printing Technologies 1997, pp. 516-521.

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