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    • 7. 发明申请
    • IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS INCUDING THE SAME
    • 图像读取装置和形成装置的图像形成装置
    • US20110181921A1
    • 2011-07-28
    • US12987385
    • 2011-01-10
    • Shohichi FUKUTOMEMitsuharu YoshimotoHironori OgasawaraKenji NakanishiMasahiro Imoto
    • Shohichi FUKUTOMEMitsuharu YoshimotoHironori OgasawaraKenji NakanishiMasahiro Imoto
    • H04N1/04
    • H04N1/2032G03G15/50G03G15/60H04N1/12H04N1/193H04N1/407H04N1/4097
    • An image reading apparatus of the present invention includes a photoelectric transducer that performs reading scanning along a main scanning line and reads an original, the image reading apparatus obtaining a white shading level of pixels based on an output level of the photoelectric transducer obtained when a reference white is read, obtaining a black shading level of the pixels based on an output level of the photoelectric transducer obtained when a black reference is read or obtained in a dark condition, and correcting the output level of the photoelectric transducer obtained when an original image is read with the use of the white shading level and the black shading level, and the image reading apparatus further comprising a correction unit that obtains a variation amount of the white shading level between a pixel and other pixels in the vicinity of that pixel for each of pixels on the main scanning line, determines whether the variation amount exceeds a pre-set threshold value, and when the correction unit determines that the variation amount exceeds the threshold value, corrects the black shading level of the pixel subject to that determination to increase the black shading level.
    • 本发明的图像读取装置具有:沿着主扫描线进行读取扫描并读取原稿的光电变换器,所述图像读取装置基于当基准时获得的光电转换器的输出电平获得像素的白色阴影电平 基于当在黑暗条件下读取或获得黑色参考时获得的光电转换器的输出电平,并且校正当原始图像为原始图像时获得的光电转换器的输出电平,从而获得黑色黑色阴影电平 通过使用白色阴影电平和黑色阴影电平来读取,并且图像读取装置还包括校正单元,该校正单元获得像素与该像素附近的其他像素之间的白色阴影电平的变化量, 主扫描线上的像素,确定变化量是否超过预设阈值a 当校正单元确定变化量超过阈值时,校正经过该确定的像素的黑色阴影水平以增加黑色阴影水平。