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首页> 外文会议>Color imaging XV: 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：使用空间频率和颜色分离性的聚类点彩色半色调水印

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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：提出了一种用于聚点彩色半色调水印的框架。水印图案逐个嵌入到彩色半色调中。对于典型的CMYK打印系统，普通的台式RGB彩色扫描仪无法提供单独的着色剂半色调分离，这会混淆每个分离的检测方法。由于K着色剂在整个光谱中均匀吸收，因此不仅会在扫描仪通道中始终出现K着色剂，而且由于不希望的吸收，在扫描仪彩色通道中还会观察到CMY分离之间的交叉耦合。我们证明，通过利用簇点颜色半色调的空间频率和颜色可分离性，可以从扫描的RGB图像中获得各个着色剂半色调分离的估计。这些估计值虽然不完美，但可以使每个间隔的检测有效地进行。使用连续相位调制嵌入逐个水印的方法证明了该方法的有效性。

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