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    Image reading apparatus for reducing color differences
    3.
    发明授权
    Image reading apparatus for reducing color differences 失效
    用于减少色差的图像读取装置

    公开(公告)号：US06225934B1

    公开(公告)日：2001-05-01

    申请号：US09122445

    申请日：1998-07-24

    申请人： Kazuhito Ohashi ,  Noriyoshi Chizawa ,  Masafumi Kamei ,  Takashi Sugiura

    发明人： Kazuhito Ohashi ,  Noriyoshi Chizawa ,  Masafumi Kamei ,  Takashi Sugiura

    IPC分类号： H03M112

    CPC分类号： H04N1/56

    摘要： This invention provides an image reading method and apparatus which can prevent a large difference from being produced between the color tones of the read image and the original image. A plurality of signals output from an image sensor (101) are A/D-converted into a plurality of digital signals by A/D conversion circuits (105), a predetermined one of the A/D-converted digital signals is compared with a predetermined reference level by a comparator (108), a low-pass filter (109) removes any high-frequency component from the comparison result, and the output from the low-pass filter (109) is controlled to be input to the A/D conversion circuits (105) as a reference voltage for determining the input range of each A/D conversion circuit (105).

    摘要翻译： 本发明提供一种可以防止在读取图像的色调和原始图像之间产生较大差异的图像读取方法和装置。 从图像传感器（101）输出的多个信号由A / D转换电路（105）进行A / D转换成多个数字信号，将A / D转换的数字信号中的预定的一个与 通过比较器（108）的预定参考电平，低通滤波器（109）从比较结果中去除任何高频分量，并且控制来自低通滤波器（109）的输出以输入到A / D转换电路（105）作为用于确定每个A / D转换电路（105）的输入范围的参考电压。

    Image reading apparatus and control program therefor
    7.
    发明授权
    Image reading apparatus and control program therefor 有权
    图像读取装置及其控制程序

    公开(公告)号：US07518757B2

    公开(公告)日：2009-04-14

    申请号：US10661824

    申请日：2003-09-12

    申请人： Noriyoshi Chizawa ,  Katsuhiro Ishido

    发明人： Noriyoshi Chizawa ,  Katsuhiro Ishido

    IPC分类号： G06K9/40 ,  H04N1/58

    CPC分类号： H04N1/4097 ,  G06T7/0004 ,  G06T2207/30144

    摘要： There is provided an image reading apparatus that is capable increasing the detection accuracy for dust, scratches, dirt, and the like. Sixty-four lines of sampling points on a reference standard white plate are read, shading correction and averaging are carried out the read image data to suppress random noise components in the image data, the data is then stored in a sampling memory, and dust detection is carried out on the data stored in the sampling memory. Alternatively, shading correction and dust detection are carried out on image data that has been subjected to linear interpolation. It is thus possible to increase the accuracy of detection of dust, scratches, dirt, and the like while ensuring that shading correction is performed at high speed.

    摘要翻译： 提供了能够提高灰尘，划痕，污物等的检测精度的图像读取装置。 读取参考标准白板上的64个采样点线，对所读取的图像数据执行阴影校正和平均以抑制图像数据中的随机噪声分量，然后将数据存储在采样存储器中，并且进行灰尘检测 对存储在采样存储器中的数据执行。 或者，对经过线性插值的图像数据进行阴影校正和灰尘检测。 因此，可以在确保高速进行阴影校正的同时提高灰尘，划痕，污物等的检测精度。