Line screen having extended dynamic tone range for embedding mac

Details Line screen having extended dynamic tone range for embedding mac Line screen having extended dynamic tone range for embedding mac

1998-01-29

2000-06-27

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

358459, 235494, 380 54, 382237, H04N 1405, G06K 1906

Patent

active

060813458

ABSTRACT:
A high performance halftone shape for embedding machine readable data in printed documents is based on a hyperbola to accommodate the embedded data over an extended dynamic tone range. The shape enables precise tone control and can used for color printing. By rotating the shape 45-degrees, two alternate "ortho-serpentine" structures can be constructed which can be added to the diagonal structures, creating an embedded data system with four orientations. The quadrature system also allows more and varied patterns, but has the disadvantage of additional noise.

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