Invention Grant
US08970910B2 Visible and invisible watermarking of printed images via 2nd generation stochastic seed frequency modulation
有权
通过第二代随机种子频率调制的可见和不可见的水印印刷图像
- Patent Title: Visible and invisible watermarking of printed images via 2nd generation stochastic seed frequency modulation
- Patent Title (中): 通过第二代随机种子频率调制的可见和不可见的水印印刷图像
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Application No.: US13313329Application Date: 2011-12-07
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Publication No.: US08970910B2Publication Date: 2015-03-03
- Inventor: Edgar A. Bernal , Shen-ge Wang , Robert P. Loce , Zhigang Fan
- Applicant: Edgar A. Bernal , Shen-ge Wang , Robert P. Loce , Zhigang Fan
- Applicant Address: US CT Norwalk
- Assignee: Xerox Corporation
- Current Assignee: Xerox Corporation
- Current Assignee Address: US CT Norwalk
- Agency: Fay Sharpe LLP
- Main IPC: H04N1/405
- IPC: H04N1/405 ; G06K15/00
Abstract:
As set forth herein, computer-implemented methods and systems facilitate watermarking documents and/or images using 2nd generation stochastic halftoning. The watermark is used to spatially vary the gray level at which a frequency modulation-to-amplitude modulation transition occurs. The encoding algorithm uses as inputs a contone image and a watermark. The visibility of the watermark is controlled by the magnitude of the difference between the AM-to-FM transition threshold values.
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