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    • 94. 发明授权
    • Image reading apparatus
    • 图像读取装置
    • US06175660B1
    • 2001-01-16
    • US09045862
    • 1998-03-23
    • Takayuki NabeshimaHiroshi Murakami
    • Takayuki NabeshimaHiroshi Murakami
    • G06K940
    • H04N1/401
    • An image reading apparatus is provided which is capable of correctly reproducing a read image, by correcting variation in read data derived from variation in light intensity and variation in sensitivity, using reading means capable of logarithmic conversion such as an LOG CCD. As variation in read data caused by insufficient light intensity in a shade region of an original is corrected, even when there is a shade in an original image having halftone gradation, satisfactory image reproduction is possible. Since variation in read data caused by insufficient light intensity at the time of zooming is corrected, image quality is not degraded even when electrical zooming is performed. Further, variation in read data caused by fluctuation in light intensity, variation in photosensitivity and types of original is corrected, AD conversion with uniform resolution is possible even when output levels differ because of light distribution variation of a light source or variation in sensitivity of sensors.
    • 提供一种图像读取装置,其能够通过使用能够进行对数转换的读取装置(例如LOG CCD)来校正从光强度变化和灵敏度变化导出的读取数据的变化来正确地再现读取图像。 由于校正了原稿的阴影区域中由于光强度不足引起的读取数据的变化,即使在具有半色调等级的原始图像中存在阴影,也能够满意地进行图像再现。 由于在变焦时由于光强度不足引起的读取数据的变化被校正,即使进行电变焦,图像质量也不会降低。 此外,由于光强度的变化,光敏性和原始类型的变化引起的读取数据的变化被校正,即使当由于光源的光分布变化或传感器的灵敏度的变化而导致输出电平不同时,也能够以均匀的分辨率进行AD转换 。