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41 条记录 (耗时 0.014 秒)

    Dynamic sample-by-sample automatic gain control
    33.
    发明授权
    Dynamic sample-by-sample automatic gain control 失效
    动态样品 - 样品自动增益控制

    公开(公告)号：US3872434A

    公开(公告)日：1975-03-18

    申请号：US42181473

    申请日：1973-12-05

    申请人： RECOGNITION EQUIPMENT INC

    发明人： DUVALL DALE R ,  NEFF MARION W ,  LAWSON PAUL D

    IPC分类号： G06K9/38 ,  H03G3/20 ,  H04N1/401 ,  G06K9/02

    CPC分类号： H03G3/3084 ,  G06K9/38 ,  G06K2209/01 ,  H04N1/401

    摘要： Gain control for an optical reader having a scanned photocell array producing a multiplexed analog signal stream by cyclically sampling the signals on channels leading from the cells in the array. A memory stores digital coded words, one word for each given channel with each word representative of the response characteristics of a given channel. A multibit digital-to-analog converter receives the multiplexed signal. In synchronism with multiplexing the signals, gain control words are read from memory and each converted to an analog gain control voltage which is applied to the converter in coincidence with the appearance at the converter of the signals from the given channel to which the word corresponds to produce a multiplexed digital stream at the output of the amplifier independent of differences in responses of the channels to the same field of view.

    摘要翻译： 具有扫描的光电池阵列的光学读取器的增益控制通过对从阵列中的单元引出的通道上的信号进行循环采样来产生复用的模拟信号流。 存储器存储数字编码字，每个给定通道一个字，每个字表示给定通道的响应特性。 多位数模转换器接收多路复用信号。 与多路复用信号同步，增益控制字从存储器中读取，并且每个转换为模拟增益控制电压，该模拟增益控制电压与转换器上出现的来自与字对应的给定通道的信号一致 在放大器的输出处产生多路复用的数字流，而与通道的响应差异相同。

    Apparatus for controlling fingerprint identification
    34.
    发明授权
    Apparatus for controlling fingerprint identification 失效
    用于控制指纹识别的装置

    公开(公告)号：US3804524A

    公开(公告)日：1974-04-16

    申请号：US28550272

    申请日：1972-08-31

    申请人： NANUS G ,  JOCOY K

    发明人： JOCOY K ,  NANUS G

    IPC分类号： A61B5/117 ,  G06K9/00 ,  G06K9/02

    CPC分类号： G06K9/00919 ,  A61B5/1172 ,  G06K9/00013

    摘要： Apparatus for directing and positioning a finger for print identification comprises a window having a surface on which a finger is placed, forwardly moving stop means for determining longitudinal placement of a finger and lateral finger guide means for determining the location of said finger with respect to said window, the first of said lateral guide means being substantially laterally stationary and the second being movable and biased toward said first lateral guide means, and means for directing a hand toward said window.

    摘要翻译： 用于引导和定位用于打印识别的手指的装置包括具有其上放置手指的表面的窗口，用于确定手指的纵向放置的前进移动停止装置和用于确定所述手指相对于所述手指的位置的侧指指引装置 所述横向引导装置中的第一个基本上是横向固定的，并且所述第二横向引导装置可移动并朝向所述第一横向引导装置偏置，以及用于将手指向所述窗口的装置。

    Optical straight line detector
    36.
    发明授权
    Optical straight line detector 失效
    光直线检测器

    公开(公告)号：US3740153A

    公开(公告)日：1973-06-19

    申请号：US3740153D

    申请日：1970-10-13

    申请人： WESTINGHOUSE ELECTRIC CORP

    发明人： WOOD W

    IPC分类号： G02B27/64 ,  G06K9/74 ,  G06K9/02

    CPC分类号： G02B27/642 ,  G06K9/74

    摘要： A simple means of detecting a straight line or edge using noncoherent optical techniques. An object is imaged onto a rotating film loop by a lens. The film loop has a number of parallel, equally spaced bars. When a straight line is detected which is parallel to the bars on the rotating film, its presence is indicated by a large signal being emitted by a photodetector.

    摘要翻译： 使用非相干光学技术检测直线或边缘的简单手段。 物体通过透镜成像到旋转膜环上。 薄膜回路具有多个平行的等间隔的条。 当检测到与旋转膜上的条平行的直线时，其存在由光电检测器发射的大信号指示。