Method for coherent watermark insertion and detection in...

Details Method for coherent watermark insertion and detection in... Method for coherent watermark insertion and detection in...

2011-05-31

2011-05-31

Baker, Charlotte M (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S534000, C358S003060

Reexamination Certificate

active

07952767

ABSTRACT:
A method for generating an authenticable color image, the color image including a plurality of color separations, wherein an authentication image inserted in the multicolor image is not readily visually perceptible, includes halftoning image data corresponding to a first color separation using a single halftone screen, wherein the halftone screen includes means for generating an authentication image in a color image; and halftoning image data corresponding to a second color separation using the halftone screen and dot placement information for the image data corresponding to the first color separation to form a multicolor image; wherein halftoning of image data corresponding to the second color separation includes placing dots for the second color separation in thresholds of the halftone screen relative to those thresholds occupied by the first color separation in the halftone screen in accordance with a predetermined relationship.

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A European Search Report dated Mar. 27, 2009 for corresponding European patent application EP 07122709.4.
Fu et al.: “Watermarking technique for color halftone images” ; 2004. Proceedings. (ICASSP ' 04); IEEE International Conference, Montreal,CA May 17-24, 2004, Piscataway, NJ, USA,IEEE, vol. 3, May 17, 2004 , pp. 381-384, XP010718206.

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