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    • 10. 发明授权
    • Control circuit of image reader, image reader, control method of image reader, and program
    • 图像读取器的控制电路,图像读取器,图像读取器的控制方法和程序
    • US08233192B2
    • 2012-07-31
    • US12383414
    • 2009-03-24
    • Kenji Kobayashi
    • Kenji Kobayashi
    • H04N1/40
    • H04N1/60H04N1/603
    • A control circuit of an image reader having at least one light source includes: a light source control portion that controls ON and OFF of the light source by performing current switching for adjusting a value of a current supplied to the light source; a black reference data creating portion that creates black reference data used for shading correction under control of the light source control portion; an image reading portion that reads image data under control of the light source control portion; and a shading correction portion that performs shading correction of the image data using the black reference data. The black reference data creating portion adds a noise, which is equivalent to a noise added to the image data by the current switching, to the black reference data, and the shading correction portion removes the noise added to the image data by performing the shading correction.
    • 具有至少一个光源的图像读取器的控制电路包括:光源控制部分,通过执行电流切换来控制光源的导通和截止,以调节提供给光源的电流的值; 黑色基准数据生成部,其在光源控制部的控制下,生成用于阴影校正的黑色基准数据; 图像读取部,其在所述光源控制部的控制下读取图像数据; 以及阴影校正部分,其使用黑色参考数据执行图像数据的阴影校正。 黑参考数据创建部分将通过当前切换添加到图像数据的噪声等效的噪声添加到黑参考数据,并且阴影校正部分通过执行阴影校正来去除添加到图像数据的噪声 。