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Correlation Marks
Correlation Marks provide a unique and simple method to protect and track
documents. Based in digital screening technology, Correlation Marks take
advantage of spatial correlations in halftone screens to create a
self-authenticating, secure document containing an invisible, hidden image.
Technology Description
Using Correlation Marks, invisible images are hidden within a normal, visible
image, such as a photograph, using specially designed halftone screens. The
halftone screens used to embedded the Correlation Marks can be used like any
traditional halftone screen, - no additional image processing is required.
Different from digital watermarking technology, Correlation Mark technology
hides an invisible image during the printing process, No alteration to the
original image data is required. And because the hidden mark is inserted during
the printing process, each copy of a document can have a unique hidden image.
Hidden images made using Correlation Marks technology are not visible to the
human eye. They can be detected either by scanning and processing the printed
image, or by overlaying a transparency containing a ‘key’ on top of the
document to reveal the hidden image. Correlation Marks are robust to copying
and distortion and can be detected in reproductions of the halftone image.
Benefits
- Self-authenticating
- Compatible with traditional halftoning and printing processes
- Original image data preserved
- Each document copy can have a unique hidden image
- Robust to copying for document tracking
Applications
Security
- Product Fraud – protection against counterfeiting
- Negotiable Documents – currency, tickets, coupons, checks
- Identification and Authentication – ID’s, licenses, certificates
- Sensitive Documents and Contracts – financial, legal, health care
Imaging
- Protecting ownership rights of an image
- Authenticating an image to show it has not been altered
Promotion and Advertising
Intellectual Property Summary
Xerox Intellectual Property includes patents, patent applications, and know-how.
For your convenience and review, we have provided a sample of selected patents
from our portfolio.
| U.S.
7706025 |
Moire-based
auto-stereoscopic watermarks |
| U.S. 7515732 |
Method of embedding color
information in printed documents using watermarking |
| U.S.
7436977 |
Embedding variable
watermark information in halftone screens |
| U.S. 7352879 |
Conjugate cluster screens for
embedding digital watermarks into printed halftone documents |
| U.S.
7006256 |
Watermarked image
generator and method of embedding watermarks into an input image |
| U.S. 6731409 |
System and method for generating
color digital watermarks using conjugate halftone screens |
| U.S.
6526155 |
Systems and methods for
producing visible watermarks by halftoning |
| U.S. 6263086 |
Automatic detection and retrieval
of embedded invisible digital watermarks from halftone images |
| U.S.
6252971 |
Digital watermarking
using phase-shifted stoclustic screens |
| U.S. 5790703 |
Digital watermarking using
conjugate halftone screens |
For Licensing Information
To learn more about licensing the Correlation Marks technology.
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United States
