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    • 8. 发明授权
    • Image reader with adjustable contrast range
    • 具有可调整对比度范围的图像读取器
    • US5329111A
    • 1994-07-12
    • US904053
    • 1992-06-26
    • Shinya SonodaAtsushi NodaHiroki TabataMasashi SugimotoJunji Hiraishi
    • Shinya SonodaAtsushi NodaHiroki TabataMasashi SugimotoJunji Hiraishi
    • H04N1/407H04N1/60H04N5/243H01J40/14H04N3/14
    • H04N5/361H04N1/4076H04N1/6027H04N5/243
    • An image input device photoelectrically reads a document and outputs digital data. This image reader includes a first voltage generating circuit for generating a first voltage for setting an upper limit of contrast, a second voltage generating circuit for generating a second voltage for setting a lower limit of contrast, and an A/D converter for converting an input analog signal to a digital signal in accordance with the first and second voltages. At least one of the voltages generated by the first voltage generating circuit and second voltage generating circuit is variable. Also disclosed is an image reader including a dark voltage memory circuit, storing dark voltages corresponding to color signals R, G and B, a first switching circuit sequentially switching the output of the dark voltage memory circuit and outputting a selected dark voltage, a second switching circuit adapted to synchronously output a selected color signal corresponding to the selected dark voltage, and a differential amplifier subtracting the selected dark voltage from said selected color signal.
    • 图像输入装置光电读取文件并输出数字数据。 该图像读取器包括用于产生用于设定对比度上限的第一电压的第一电压产生电路,用于产生用于设置对比度下限的第二电压的第二电压产生电路,以及用于转换输入的A / D转换器 根据第一和第二电压对数字信号进行模拟信号。 由第一电压产生电路和第二电压产生电路产生的电压中的至少一个是可变的。 还公开了一种图像读取器,其包括暗电压存储电路,存储对应于彩色信号R,G和B的暗电压,第一开关电路依次切换暗电压存储电路的输出并输出选择的暗电压,第二开关 电路,其适于同步地输出对应于所选择的暗电压的选定颜色信号,以及差分放大器,从所述选择的颜色信号中减去所选择的暗电压。