Image analysis – Applications
Reexamination Certificate
2006-01-31
2006-01-31
Miriam, Daniel (Department: 2625)
Image analysis
Applications
C358S003280
Reexamination Certificate
active
06993150
ABSTRACT:
The present invention relates to a method for embedding a digital watermark into a halftone image comprised of clusters of halftone dots, which are referred to as geometric primitives. This method embeds a watermark image signal including an array of multilevel per pixel delta values by increasing or decreasing the size of a corresponding cluster of halftone dots. In particular, each delta value represents a change in luminance in one implementation, but this delta value could correspond to other color planes of a monotone or color halftone image. The watermark embedder subtly changes the halftone primitives by toggling boundary pixels on or off in a manner that grows or shrinks the primitive.
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Choobin Barry
Digimarc Corporation
Digimarc Corporation
Miriam Daniel
LandOfFree
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