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US 8,077,907 B2Granted
System and method for the generation of correlation-based digital watermarks
AssigneeXerox Corporation
InventorShen-ge Wang
Life of this patent
Estimating the term…
Abstract
Disclosed are systems and methods directed to digital watermarks, and more particularly, the generation of invisible correlation-based digital watermarks embedded in halftone images.
Claims17
A method for digital watermarking of an image, comprising:
- receiving the image to be watermarked;
- determining the watermark to be embedded in the image;
- embedding an invisible digital watermark into the image using a multi-dimensional threshold operation, wherein at least one input thereto is a phase shift value such that the threshold applied at any particular pixel is chosen using the phase shift value;
- and
- outputting the watermarked image containing the embedded invisible digital watermark.
2 more elements
A method for digital watermarking of an image, comprising:
- receiving the image to be watermarked;
- determining a watermark to be embedded in the image;
- embedding the watermark into the image using a multi-dimensional threshold array including applying a phase-shift transition therewith, wherein at least one input thereto is a phase shift value, wherein applying a phase-shift transition further comprises, for a given location with coordinates x and y, choosing an input value from the image and a threshold value determined by the coordinates x and y, for a phase shift s, and where a resultant gray level g is read from the processed watermark image;
- and
- outputting the watermarked image containing the embedded digital watermark, wherein the image includes an invisible digital watermark.
2 more elements
A system for digital watermarking of an image, comprising:
- an input image source;
- image memory for storing the input image to be watermarked;
- watermark memory for storing the watermarks to be embedded in the image;
- and
- an image processor for embedding a plurality of invisible digital watermarks into the image, said image processor including a multi-dimensional threshold array where at least one input thereto is a phase shift value retrieved from memory associated with said image processor, such that a threshold selected from said multi-dimensional threshold array and applied at any particular pixel is chosen using the phase shift value, and wherein the watermark is embedded into the image.
2 more elements
Dependencies are inferred from the claim text.