Image signal processing method and apparatus for limiting...

Details Image signal processing method and apparatus for limiting... Image signal processing method and apparatus for limiting...

Filed on

2005-03-10

Date issued

2009-02-17

Examiner

Haskins, Twyler L (Department: 2625)

Patent Class

Facsimile and static presentation processing

SubClass

Static presentation processing

SubSubClass

Attribute control

Other Related Categories

C358S003130, C358S520000, C358S521000, C358S523000, C358S524000, C399S028000, C399S041000

Type

Reexamination Certificate

Status

active

Patent number

07492484

Description

ABSTRACT:
Even when an image signal is converted into an image signal with a limited amount of toner adhesion, the gradation is prevented from changing rapidly near the limiting value and therefore the image quality is prevented from deteriorating. An amount-of-adhesion converting circuit301converts image data for each color plane into first amount-of-toner-adhesion data. On the basis of a preset amount-of-toner-adhesion threshold value table, an amount-of-toner-adhesion reduction computing circuit303converts the first amount-of-toner-adhesion data for each color plane into second amount-of-toner-adhesion data with a limited amount of toner adhesion. Then, an image signal converting circuit304converts the second amount-of-toner-adhesion data into an image signal. In such a method, since parameters in the amount-of-toner-adhesion threshold value table are set arbitrarily, a rapid change in gradation can be suppressed near the limiting value.

REFERENCES:
patent: 6657747 (2003-12-01), Shimamura
patent: 7099046 (2006-08-01), Yamada et al.
patent: 2003/0072035 (2003-04-01), Hagai et al.
patent: 2004/0228642 (2004-11-01), Iida et al.
patent: 2005/0185008 (2005-08-01), Couwenhoven et al.
patent: 2005/0206927 (2005-09-01), Yamada
patent: 2002-103689 (2002-04-01), None

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