Auxiliary pixel patterns for improving print quality

Details Auxiliary pixel patterns for improving print quality Auxiliary pixel patterns for improving print quality

2005-07-19

2005-07-19

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003270, C358S532000, C358S300000, C382S275000, C382S266000

Reexamination Certificate

active

06919973

ABSTRACT:
Utilization of non-printing high-spatial-frequency auxiliary pixels are introduced into the bitmap of 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 to 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.

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