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    • 10. 发明申请
    • IMAGE FORMING APPARATUS
    • 图像形成装置
    • US20090135449A1
    • 2009-05-28
    • US12277452
    • 2008-11-25
    • Takeshi WatanabeNobuhiko NakaharaShigeru FujiwaraHiroyuki Okuyama
    • Takeshi WatanabeNobuhiko NakaharaShigeru FujiwaraHiroyuki Okuyama
    • H04N1/60
    • H04N1/4078H04N1/6033H04N1/6091
    • An image forming apparatus includes a pattern formation unit which forms a first gradation screen pattern on an image carrier unit at a non-image formation operation, a gradation characteristic determination unit which determines a gradation characteristic from the first gradation pattern formed by the pattern formation unit, a first gradation correction characteristic determination unit which determines a first gradation correction characteristic from the gradation characteristic determined by the gradation characteristic determination unit, a characteristic detection unit which detects a change characteristic in the image forming apparatus just before image formation, a pattern correlation characteristic correction unit which determines a pattern correlation characteristic corresponding to the change characteristic detected by the characteristic detection unit and a second gradation correction characteristic determination unit which determines a second gradation correction characteristic by performing an arithmetic operation on the first gradation correction characteristic and the pattern correlation characteristic.
    • 图像形成装置包括在非图像形成操作下在图像载体单元上形成第一灰度级屏幕图案的图案形成单元,灰度特性确定单元,其从由图案形成单元形成的第一灰度图案确定灰度特性 第一灰度校正特性确定单元,其根据由灰度特性确定单元确定的灰度特性确定第一灰度校正特性;特征检测单元,其检测在图像形成之前的图像形成装置中的变化特性,图案相关特性 确定对应于由特征检测单元检测到的变化特征的图案相关特性的校正单元和确定第二灰度校正特性的第二灰度校正特性确定单元 对第一灰度校正特性和图案相关特性进行算术运算。