Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2007-04-03
2007-04-03
Moore, David (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003010, C358S003030, C358S003060
Reexamination Certificate
active
10000487
ABSTRACT:
Error diffusion halftoning systems and methods propagate the error both within a color layer and between the color layer being halftoned and subsequent color layers yet to be halftoned. Threshold array halftoning systems and methods diffuse error to subsequent color layers after a color layer has been halftoned using a threshold array. A color continuous tone image is separated into color layers. A plurality of weighting factors are selected that control how error is diffused to subsequent color layers as each color layer is halftoned. A first color layer is halftoned using error diffusion or threshold array halftoning. An error layer is generated from the first halftoned color layer and the first color layer. A modified second continuous tone color layer is generated based on at least one error layer and the corresponding weighting factor. That modified second continuous tone color layer is then halftoned and the process is repeated.
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Moore David
Oliff & Berridg,e PLC
Thompson James A.
Xerox Corporation
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