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    HIGH CONTRAST, LOW DISTORTION OPTICAL ACQUISITION SYSTEM FOR IMAGE CAPTURING
    2.
    发明公开
    HIGH CONTRAST, LOW DISTORTION OPTICAL ACQUISITION SYSTEM FOR IMAGE CAPTURING 有权
    系统对比度贫富PICTURE摄像畸变

    公开(公告)号：EP1131775A2

    公开(公告)日：2001-09-12

    申请号：EP99960361.6

    申请日：1999-11-12

    申请人： Secugen Corporation

    发明人： Teng, Harry H. ,  Jo, Sung-Chan

    IPC分类号： G06K9/00

    CPC分类号： G06K9/00046

    摘要： An apparatus and method for acquiring an image of a patterned object such as a fingerprint including a light refracting device, a focusing lens, and a light source. The light refracting device can, for example, be a prism and includes an imaging surface, a light receiving surface and a viewing surface. Incident light from the light source is projected through the light receiving surface and reflected off a surface other than the imaging surface. This reflected light is then projected onto the imaging surface to create an image of the patterned object from substantially all scattered light through the viewing surface. The lens is placed adjacent to the viewing surface to focus the light on an image sensor.