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首页> 外文会议>SPIE Conference on Color Imaging : Displaying, Processing, Hardcopy, and Applications >Clustered-Dot Color Halftone Watermarks using Spatial Frequency and Color Separability
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Clustered-Dot Color Halftone Watermarks using Spatial Frequency and Color Separability

机译：聚集点颜色的半色调水印使用空间频率和颜色可分性

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摘要

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.
机译：提出了集群点颜色半色调水印的框架。水印模式嵌入在每分离的颜色半色调中。对于典型的CMYK打印系统，常见的台式RGB颜色扫描仪无法提供单独的着色剂半色调分离，这使得每分离检测方法困扰。当扫描仪通道中不仅在扫描仪通道中均匀地出现在扫描仪通道中时，而且由于不需要的吸收，在扫描仪颜色通道中也观察到CMY分离之间的交叉耦合。我们证明，通过利用聚类点颜色的空间频率和颜色可分离分子，可以从扫描的RGB图像获得各种着色剂半色调分离的估计。这些估计虽然不完美，但允许每间分离检测有效地运行。使用连续相位调制来证明该方法的功效，用于嵌入每分离水印。

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