Per-separation clustered-dot color halftone watermarks: separation estimation based on spatial frequency content
نویسندگان
چکیده
منابع مشابه
Per-separation clustered-dot color halftone watermarks: separation estimation based on spatial frequency content
A framework for clustered-dot color halftone watermarking is considered, wherein watermark patterns are embedded in individual colorant halftones prior to printing and embedded watermarks are detected from scans of the printed images after obtaining estimates of the individual halftone separations. The principal challenge in this methodology arises in the watermark detection phase. Typical thre...
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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 scan...
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Spatial frequency separability is proposed as an attractive exploit for obtaining color halftone watermarking methods from monochrome clustered-dot halftone watermarking techniques. Detection of watermarks embedded in individual halftone channels is typically confounded by the cross-coupling between colorant halftone separations and scan RGB channels caused by the so-called “unwanted absorption...
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e t T t bstract. A method of converting cyan, magenta, yellow, and black CMYK) digital values into cyan, magenta, yellow, black, light cyan, nd light magenta (CMYKLcLm) in six-color printers is proposed for roviding a better print quality with less dot visibility, high color fidelty, and smooth color transition. Based on the attribute of the depenent variable Lm and Lc to M and C, the input M a...
متن کاملMisregistration sensitivity in clustered-dot color halftones
bstract. Halftoned separations of individual colorants, typically yan, magenta, yellow, and black, are overlaid on a print substrate n typical color printing systems. Displacements between these eparations, commonly referred to as “interseparation misregistraion”, can cause objectionable color shifts in the prints. We study this isregistration-induced color shift for periodic clustered-dot half...
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ژورنال
عنوان ژورنال: Journal of Electronic Imaging
سال: 2010
ISSN: 1017-9909
DOI: 10.1117/1.3497615