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    Method and apparatus for reading under sampled bar code symbols
    1.
    发明授权
    Method and apparatus for reading under sampled bar code symbols 有权
    在采样条形码符号下读取的方法和装置

    公开(公告)号：US07364081B2

    公开(公告)日：2008-04-29

    申请号：US11001776

    申请日：2004-12-02

    申请人： William H. Havens ,  Andrew Longacre, Jr. ,  Dennis W. McEnery ,  Thomas Hawley ,  Ynjiun Wang

    发明人： William H. Havens ,  Andrew Longacre, Jr. ,  Dennis W. McEnery ,  Thomas Hawley ,  Ynjiun Wang

    IPC分类号： G06K7/10 ,  G06K9/36 ,  G06K9/80 ,  G06K15/12

    CPC分类号： G06K7/1491 ,  G06K7/14 ,  G06K7/1465

    摘要： The present invention is directed to a method for reading a bar code symbol with an optical reader. The method includes the step of scanning the bar code symbol to obtain a plurality of scan lines. Each of the plurality of scan lines includes a linear array of N-pixel values. Adjacent pixels in the linear array of N-pixel values are separated by a sample separation distance. A reconstructed scan line is generated that interleaves the N-pixel values from selected scan lines of the plurality of scan lines. A reconstructed pixel sample separation distance of adjacent interleaved pixels is an integer fraction of the pixel sample separation distance.

    摘要翻译： 本发明涉及一种用光学阅读器读取条形码符号的方法。 该方法包括扫描条形码符号以获得多条扫描线的步骤。 多个扫描线中的每一条都包括N个像素值的线性阵列。 将N个像素值的线性阵列中的相邻像素分隔开一个样本间隔距离。 生成重构的扫描线，其从多条扫描线的选定扫描线交织N个像素值。 相邻交错像素的重建像素样本分离距离是像素样本间隔距离的整数分数。

    Bar code reader for reading high to low contrast bar code symbols
    2.
    发明授权
    Bar code reader for reading high to low contrast bar code symbols 失效
    用于读取高对比度条形码符号的条形码阅读器

    公开(公告)号：US5949054A

    公开(公告)日：1999-09-07

    申请号：US546588

    申请日：1995-10-23

    申请人： Thomas W. Karpen ,  William H. Havens ,  Dennis W. McEnery ,  Brian L. Jovanovski

    发明人： Thomas W. Karpen ,  William H. Havens ,  Dennis W. McEnery ,  Brian L. Jovanovski

    IPC分类号： G06K7/10 ,  G06K7/14

    CPC分类号： G06K7/10851 ,  G06K7/14 ,  G06K7/1478

    摘要： A bar code reader is provided which can read bar code symbols of varying contrast, from high to medium to low contrast. The bar code reader includes a digitizing circuit which digitizes an analog signal representing the reflectance function of a scanned bar code by comparing the analog signal to a threshold signal. In the present invention, the threshold signal is switchable between a first state wherein the threshold signal is a standard threshold signal suitable for digitizing analog signals representing medium to high contrast bar code symbols and a second state wherein the threshold signal is a non-standard threshold signal suitable for digitizing analog signals representing low contrast bar code symbols. In one embodiment of the invention, the threshold signal is manually adjustable. In another embodiment, a bar code reader is provided which automatically digitizes and decodes bar code symbols of varying contrast by repetitively scanning bar code symbols, using first and second alternating threshold signal states to digitize the analog signal resulting from each scan.

    摘要翻译： 提供了条形码阅读器，可以读取从高到中至低对比度的不同对比度的条形码符号。 条形码读取器包括数字化电路，其通过将模拟信号与阈值信号进行比较来数字化表示扫描条形码的反射函数的模拟信号。 在本发明中，阈值信号可以在第一状态和第二状态之间切换，第一状态是阈值信号是适合于对表示中高对比度条形码符号的模拟信号进行数字化的标准阈值信号，以及第二状态，其中阈值信号是非标准阈值 信号适合于数字化表示低对比度条形码符号的模拟信号。 在本发明的一个实施例中，阈值信号是可手动调节的。 在另一个实施例中，提供了一种条形码读取器，其通过使用第一和第二交替阈值信号状态来重复扫描条形码符号来自动数字化和解码变化对比度的条形码符号，以对由每次扫描得到的模拟信号进行数字化。

    Exposure control apparatus for use with optical readers
    3.
    发明授权
    Exposure control apparatus for use with optical readers 失效
    用于光学读取器的曝光控制装置

    公开(公告)号：US5831254A

    公开(公告)日：1998-11-03

    申请号：US574386

    申请日：1995-12-18

    申请人： Thomas W. Karpen ,  Dennis W. McEnery ,  Robert C. Gardiner ,  John A. Pettinelli

    发明人： Thomas W. Karpen ,  Dennis W. McEnery ,  Robert C. Gardiner ,  John A. Pettinelli

    IPC分类号： G06K7/10

    CPC分类号： G06K7/10851 ,  G06K7/10584 ,  G06K7/10752

    摘要： An exposure control apparatus for use with optical readers, such as bar code readers, which utilize photosensitive image sensors. An illumination signal generating circuit generates an illumination signal having a magnitude that varies in accordance with the time averaged value of the illumination level at the image sensor. A window detecting circuit periodically samples the illumination signal to determine if that signal is or is not within a window of acceptability. Exposure period determining circuitry uses the output of the window detecting circuit to upwardly or downwardly adjust the value of a control variable as necessary to cause the illumination signal to approach, enter and remain within the window of acceptability.

    摘要翻译： 一种用于光学读取器的曝光控制装置，例如利用光敏图像传感器的条形码阅读器。 照明信号发生电路产生具有根据图像传感器的照度级的时间平均值变化的幅度的照明信号。 窗口检测电路周期性地对照明信号进行采样，以确定该信号是否在不可接受的窗口内。 曝光周期确定电路使用窗口检测电路的输出来向上或向下调整控制变量的值，以使照明信号接近，进入并保持在可接受窗口内。

    Method and apparatus for decoding bar code symbols
    4.
    发明授权
    Method and apparatus for decoding bar code symbols 失效
    用于解码条形码符号的方法和装置

    公开(公告)号：US6152371A

    公开(公告)日：2000-11-28

    申请号：US133083

    申请日：1998-08-12

    申请人： Eric D. Schwartz ,  Vivian L. Hunter ,  Dennis W. McEnery ,  James L. Canale

    发明人： Eric D. Schwartz ,  Vivian L. Hunter ,  Dennis W. McEnery ,  James L. Canale

    IPC分类号： G06K7/10 ,  G06K7/14 ,  G06K9/22

    CPC分类号： G06K7/10851 ,  G06K7/14

    摘要： A method and apparatus for reading and decoding one-dimensional (1D) bar code symbols. A 1D bar code symbol is imaged by an optical assembly which includes a cubic phase mask that causes the optical transfer function of the optical assembly to remain approximately constant over a range of distances between the apparatus and the symbol to be read. An electrical representation of the resulting image is converted to a smoothly varying analog image signal. A transition identifying circuit processes the analog image signal, without first applying a recovery function that takes into account the effect of the phase mask, and generates a binary signal which is used to decode the symbol.

    摘要翻译： 一维（1D）条形码符号的读取和解码方法和装置。 1D条形码符号由包括立体相掩模的光学组件成像，所述三次相位掩模使光学组件的光学传递函数在装置和要读取的符号之间的距离范围内保持大致恒定。 所得到的图像的电表示被转换成平滑变化的模拟图像信号。 转换识别电路处理模拟图像信号，而不首先应用考虑到相位掩模的影响的恢复功能，并且生成用于对符号进行解码的二进制信号。