Dither pattern generating apparatus for generating dither...

Details Dither pattern generating apparatus for generating dither... Dither pattern generating apparatus for generating dither...

2004-12-10

2009-12-29

Tran, Douglas Q (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Emulation or plural modes

C358S001900

Reexamination Certificate

active

07639377

ABSTRACT:
In a printer which corrects a density change by measuring densities of a plurality of output dither patterns (test patterns) by a sensor and obtaining a γ characteristic curve, the following processes are performed. Data of the present number of print sheets is obtained from a print sheet counter in the printer. On the basis of the obtained data, a proper sensor density curve is selected. A sensor value obtaining unit obtains density data of a generated test pattern. On the basis of the selected sensor density curve and the obtained density data, a γ characteristic curve is calculated. A dither pattern is generated based on the γ characteristic curve.

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Official Action issued by the Japanese Patent Office on Oct. 10, 2006, in priority JP application No. 2004-268478, and English translation thereof.

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