Digital de-screening technique for scanned documents

Details Digital de-screening technique for scanned documents Digital de-screening technique for scanned documents

2003-07-01

2008-10-07

Haskins, Twyler Lamb (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003260, C358S533000, C358S003030, C382S260000, C382S261000, C382S264000, C382S263000, C382S254000, C382S265000, C382S274000, C382S284000

Reexamination Certificate

active

07433084

ABSTRACT:
A method and system for de-screening an image signal utilizing a bank of filters to provide several increasingly blurred versions of the original image signal is disclosed. At any given time, only two of these blurred versions are created, on a pixel-by-pixel basis. The outputs from the selected pair of blurred signals are then blended together to create a variable blending output that can vary smoothly from no blurring to maximum blurring in a smooth and continuous manner. In addition, the method provides the capability to enhance text and line art by using a variable un-sharp masking mechanism with independent post-blur sharpening control, and the capability to detect and enhance neutral (no-color) output pixels.

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