Digital halftone with auxiliary pixels

Details Digital halftone with auxiliary pixels Digital halftone with auxiliary pixels

2006-03-21

2006-03-21

Rogers, Scott A. (Department: 2627)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003060, C358S003140, C358S003270, C358S300000

Reexamination Certificate

active

07016073

ABSTRACT:
Utilization of non-printing high-spatial-frequency auxiliary pixels are introduced into the bitmap of halftones utilized in an image to obtain local control of the image development by modification of local average voltage in the development nip. These auxiliary pixels embody frequencies or levels of charge that are past the threshold for printing on the Modulation Transfer Function (MTF) curve, and therefore by themselves result in no toner deposition on the resultant page. These auxiliary pixels will however, position the toner cloud by modulating it and compensate for cleaning field and toner supply effects. This will better position the toner cloud to ensure adequate toner supply to all parts of the image so that the desired printing pixels will print as intended and provide a more faithful rendering of grayscale information in the image.

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