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    • 7. 发明授权
    • Image reading device, image reading method, and image forming apparatus for correcting digital image signal using modulated reference signal
    • 图像读取装置,图像读取方法以及使用调制参考信号校正数字图像信号的图像形成装置
    • US08451505B2
    • 2013-05-28
    • US12719246
    • 2010-03-08
    • Masaki NagaseTohru Kanno
    • Masaki NagaseTohru Kanno
    • G06T5/00
    • H04N1/40062G06T5/002G06T2207/10008
    • A reference-signal generating unit generates a reference signal for generating a driving signal to drive other units of the image reading device. A frequency modulating unit modulates frequency of the reference signal, thereby generating a frequency-modulated reference signal. A driving-signal generating unit generates the driving signal from the frequency-modulated reference signal. A photoelectric converting unit converts an incident light into an analog image signal using the driving signal. An AD converting unit converts the analog image signal into a digital image signal. A correcting unit corrects the digital image signal by generating a correction signal for eliminating a noise superimposed on the digital image signal using the frequency-modulated reference signal and adding the correction signal to the digital image signal.
    • 参考信号产生单元产生用于产生驱动信号以驱动图像读取装置的其它单元的参考信号。 频率调制单元调制参考信号的频率,从而生成调频参考信号。 驱动信号生成单元从调频参考信号生成驱动信号。 光电转换单元使用驱动信号将入射光转换为模拟图像信号。 AD转换单元将模拟图像信号转换为数字图像信号。 校正单元通过使用调频参考信号产生用于消除叠加在数字图像信号上的噪声的校正信号来校正数字图像信号,并将校正信号加到数字图像信号上。
    • 8. 发明授权
    • Image reading device and image forming device
    • 图像读取装置和图像形成装置
    • US08102574B2
    • 2012-01-24
    • US12041196
    • 2008-03-03
    • Masaki Nagase
    • Masaki Nagase
    • H04N1/40H04N1/04
    • H04N1/486H04N5/2176H04N5/361
    • An image reading device includes a processing circuit having a clamp unit that matches an offset potential of an inputted analog image signal to a predetermined value, a processing unit that subjects an analog image signal obtained from the clamp unit to analog processing, and a converting unit that converts a processed analog image signal to a digital image signal. A control unit for controlling the processing circuit includes a switching unit that switches a main scanning line period of a charge coupled device and outputs analog image signals using a number of reading speeds, and a changing unit that changes a clamp period depending on the main scanning line period.
    • 一种图像读取装置包括具有将输入的模拟图像信号的偏移电位与预定值相匹配的钳位单元的处理电路,对从钳位单元获得的模拟图像信号进行模拟处理的处理单元,以及转换单元 其将经处理的模拟图像信号转换为数字图像信号。 用于控制处理电路的控制单元包括切换单元,其切换电荷耦合器件的主扫描线周期并使用多个读取速度输出模拟图像信号;以及改变单元,其根据主扫描改变钳位周期 行期。
    • 9. 发明申请
    • IMAGE READING DEVICE AND IMAGE READING METHOD
    • 图像读取装置和图像读取方法
    • US20080297616A1
    • 2008-12-04
    • US12119941
    • 2008-05-13
    • Masaki NagaseTohru Kanno
    • Masaki NagaseTohru Kanno
    • H04N5/228
    • H04N5/3692H04N1/1013H04N1/193H04N1/40056
    • In an image reading device, a sampling-and-holding circuit generates a plurality of analog image signals by sampling an image signal at each sampling-and-holding timing and holding sampled image signals for a predetermined amount of time, an analog-to-digital converting unit converts the analog image signals into a plurality of digital image signals at each sampling-and-holding timing, a phase regulating unit performs phase regulation of each sampling-and-holding timing based on corresponding digital image signals to obtain phase-regulated sampling-and-holding timing. The sampling-and-holding circuit generates the analog image signal at each phase-regulated sampling-and-holding timing.
    • 在图像读取装置中,采样和保持电路通过在每个采​​样和保持定时对图像信号进行采样而产生多个模拟图像信号,并将采样的图像信号保持预定的时间量,模拟 - 数字转换单元在每个采样和保持定时将模拟图像信号转换成多个数字图像信号,相位调节单元基于相应的数字图像信号执行每个采样和保持定时的相位调节,以获得相位调节 采样和保持定时。 采样和保持电路在每个相位调节的采样和保持定时产生模拟图像信号。