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    • 5. 发明授权
    • Image reading apparatus and control program therefor
    • 图像读取装置及其控制程序
    • US07518757B2
    • 2009-04-14
    • US10661824
    • 2003-09-12
    • Noriyoshi ChizawaKatsuhiro Ishido
    • Noriyoshi ChizawaKatsuhiro Ishido
    • G06K9/40H04N1/58
    • H04N1/4097G06T7/0004G06T2207/30144
    • 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.
    • 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。