
Proceedings Paper
Clustered-dot color halftone watermarks using spatial frequency and color separabilityFormat | Member Price | Non-Member Price |
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Paper Abstract
A framework for clustered-dot color halftone watermarking is proposed. Watermark patterns are embedded in
the color halftone on per-separation basis. For typical CMYK printing systems, common desktop RGB color
scanners are unable to provide the individual colorant halftone separations, which confounds per-separation
detection methods. Not only does the K colorant consistently appear in the scanner channels as it absorbs
uniformly across the spectrum, but cross-couplings between CMY separations are also observed in the scanner
color channels due to unwanted absorptions. We demonstrate that by exploiting spatial frequency and color
separability of clustered-dot color halftones, estimates of the individual colorant halftone separations can be
obtained from scanned RGB images. These estimates, though not perfect, allow per-separation detection to
operate efficiently. The efficacy of this methodology is demonstrated using continuous phase modulation for the
embedding of per-separation watermarks.
Paper Details
Date Published: 18 January 2010
PDF: 12 pages
Proc. SPIE 7528, Color Imaging XV: Displaying, Processing, Hardcopy, and Applications, 75280Y (18 January 2010); doi: 10.1117/12.839293
Published in SPIE Proceedings Vol. 7528:
Color Imaging XV: Displaying, Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu; Shoji Tominaga; Alessandro Rizzi, Editor(s)
PDF: 12 pages
Proc. SPIE 7528, Color Imaging XV: Displaying, Processing, Hardcopy, and Applications, 75280Y (18 January 2010); doi: 10.1117/12.839293
Show Author Affiliations
Basak Oztan, Univ. of Rochester (United States)
Gaurav Sharma, Univ. of Rochester (United States)
Published in SPIE Proceedings Vol. 7528:
Color Imaging XV: Displaying, Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu; Shoji Tominaga; Alessandro Rizzi, Editor(s)
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