Patent
Digital watermarking process
Shen-ge Wang,Reiner Eschbach +1 more
- 21 Jul 2006
20
TL;DR: In this paper, a method of embedding digital watermarks such as logos, letters or other types of user information into printed documents using different halftone textures was proposed, which can be embedded into the input images at run time.
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Abstract: A method of embedding digital watermarks such as logos, letters or other types of user information into printed documents using different halftone textures. By alternating different halftone methods, such as different halftone screens or different error diffusion algorithms during the halftoning process, digital watermarks can be embedded into the input images at run time. The actual watermark is created by changing—on a pixel basis—the halftoning algorithm that is used in rendering the input image. No modifications to the input image are needed and the image data is reproduced correctly, but with a visible seem between different halftoning techniques.
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Citations
Patent
Lifestyle companion system
Glenn Gregory Gilley,Sarah Brody,Randall Hayes Ubillos,Mihnea Calin Pacurariu,Jesse Lee Dorogusker,Robert E. Borchers,Donald Ginsburg +6 more
- 27 Mar 2007
TL;DR: In this paper, a lifestyle companion system can provide a platform to conduct a user interview and suggest activities, references, and/or plug-in modules based on the user interview responses.
233
Patent
Method for encoding and decoding data in a color barcode pattern
Orhan Bulan,Vishal Monga,Gaurav Sharma +2 more
- 06 May 2009
TL;DR: In this article, the spectral properties of the CMY colorants, commonly used in digital printing, and those of RGB sensors are exploited to achieve high capacity data embedding rates in color barcodes.
48
Patent
Encoding message data in a cover contone image via halftone dot orientation
Vishal Monga,Gaurav Sharma,Orhan Bulan +2 more
- 10 Sep 2008
TL;DR: In this article, a method for encoding/decoding data in a cover contone image via halftone dot orientation modulation is presented, which is applicable to areas of data embedding, document security, and the like.
29
Patent
System and Method for the Generation of Multiple Angle Correlation-Based Digital Watermarks
Shen-ge Wang,Robert J. Rolleston +1 more
- 31 Aug 2007
TL;DR: In this paper, the authors present a method for the generation of digitally watermarked grayscale images having a watermark embedded at different arbitrary Rotation Angles, where a single public key can be used to retrieve the otherwise invisible watermarks from the watermarked images when overlaid atop the images at Orientation Angles corresponding to the Rotation angles.
28
Patent
Decoding message data embedded in an image print via halftone dot orientation
Vishal Monga,Gaurav Sharma,Orhan Bulan +2 more
- 10 Sep 2008
TL;DR: In this article, a method for encoding/decoding data in a cover contone image via halftone dot orientation modulation is presented, which is applicable to areas of data embedding, document security, and the like.
15
References
Patent
Color correct digital watermarking of images
Gordon W. Braudaway,Karen A. Magerlein,Frederick Cole Mintzer +2 more
- 11 Jan 1996
TL;DR: In this article, a system for placing a visible watermark on a digital image is disclosed, wherein an image of the watermark is combined with the digital image, and for each pixel whose value is not a specified "transparent" value, the corresponding pixel of the original image is modified by changing its brightness but its chromaticities.
371
Patent
Digital watermarking using stochastic screen patterns
Keith T. Knox
- 24 Sep 1996
TL;DR: In this paper, a method for generating watermarks in a digitally reproducible document which are substantially invisible when viewed is described, including the steps of: (1) producing a first stochastic screen pattern suitable for reproducing a gray image on a document; (2) deriving at least one stochastically screen description that is related to the first pattern; (3) producing the first stocha- screen; and (4) producing another document containing one or more of the stocha screens in combination, whereby upon placing the first and second document in superposition relationship
274
Patent
Digital watermarking using conjugate halftone screens
Shen-ge Wang
- 21 Jan 1997
TL;DR: In this paper, a method for generating watermarks in a digitally reproducible document which are substantially invisible when viewed including the steps of: (1) producing a first screen pattern suitable for reproducing a gray image on a document; (2) deriving at least one conjugate screen description that is related to said first pattern; (3) producing an image containing the first screen; (4) producing another image containing first and the second screens in combination, whereby upon placing the first and second images in a superposed relationship autocorrelation between the first pattern on each
201
Patent
Digital watermarking using phase-shifted stoclustic screens
Shen-Ge Wang
- 16 Apr 1999
TL;DR: In this paper, a system and method for digital watermark embedding and retrieval using phase shift stoclustic (stochastically clustered) screens is presented. But the method is not suitable for the detection of watermarks, especially when distortions have been introduced into the embedded image.
153
Patent
Variable angle electronic halftone screening
Thomas M. Holladay
- 07 Jul 1977
TL;DR: In this paper, an electronic signal representing the density of a scanned image is electronically halftoned by combining the pictorial signal with a rectangular array of halftone screen values to form an electronic image.
111
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