Document processing system for enhancing halftone images includi

Details Document processing system for enhancing halftone images includi Document processing system for enhancing halftone images includi

1996-03-29

1998-03-17

Coles, Sr., Edward L.

Image analysis

Image enhancement or restoration

358459, 358447, 358298, H04N 140

Patent

active

057296340

ABSTRACT:
A document processing system is provided for processing a job having one or more electronic pages with at least one of the electronic pages including a set of pixels defining a halftone image. Each pixel is disposed in one of a first state and a second state, and the set of pixels includes a plurality of dots with each dot including a group of one or more pixels disposed in the first state. The document processing system includes an image examination system for determining whether a first dot and a second dot exist within a selected subset of one of the one or more sets of pixels. When the image examination system determines that the first and second dots exist in the selected subset, the image examination system determines whether the first dot includes more or less pixels disposed in the first state than the second dot. The document processing system further includes an image manipulation system for adding a pixel portion to or subtracting a pixel portion from the first dot when it is determined, with the image examination system that the first and second dots exist in the selected subset and that the first dot includes more or less pixels disposed in the first state than the second dot.

REFERENCES:
patent: 4437122 (1984-03-01), Walsh et al.
patent: 4847641 (1989-07-01), Tung
patent: 5274472 (1993-12-01), Williams
patent: 5329599 (1994-07-01), Curry et al.
patent: 5404233 (1995-04-01), Nagata et al.
patent: 5426519 (1995-06-01), Banton
patent: 5467422 (1995-11-01), Itihara et al.
patent: 5581358 (1996-12-01), Seto et al.

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