Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2005-03-08
2005-03-08
Williams, Kimberly (Department: 2626)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003080, C358S003240, C358S003270, C358S533000, C358S540000, C382S260000, C382S261000, C382S264000, C382S266000, C382S275000
Reexamination Certificate
active
06864994
ABSTRACT:
A system and method descreen halftone images into a continuous tone image while preserving edge detail and reducing initial image blur. The descreening can be applied to monochrome or color images. Descreening is achieved by first using a low pass filter to form a blurred image of the original, which is used to guide future image filtering, but which further filtering is applied to the original image. The intelligent filtering is provided by a Sigma filter, which can be performed in a single iteration and sized and shaped according to values of the blurred image. The system and method can take a block-oriented approach that performs analysis for an entire block of pixels rather than on individual pixels. This further improves the implementation speed of the process.
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Vida Melanie
Williams Kimberly
Xerox Corporation
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