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System and Method for the Generation of Correlation-Based Digital Watermarks Using Uniform-Rosette Color Halftoning
System and Method for the Generation of Correlation-Based Digital Watermarks Using Uniform-Rosette Color Halftoning
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机译:利用均匀色泽色半色调生成基于相关性的数字水印的系统和方法
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摘要
Systems and method for digitally reproducing a moiré-free color halftone output image having an embedded correlation-based digital watermark are provided using an enhanced halftone screen set consisting of a halftone screen for each of N colorants forming N color separations (where N≧3). The N different uniform rosette halftone screen configurations are generated such that each meets uniform rosette halftone screen conditions. A corresponding three-dimensional threshold array is generated for each halftone screen configuration having a phase shift value as an input. The color input image is halftoned, halftoning each one of the N different color separations using a corresponding halftone screen configuration and three-dimensional threshold array to form a moiré-free color output image having the correlation-based digital watermark embedded therein. A single key can be used to produce a full color image of the output image having the watermark image visible therein.
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