Analog reconstruction circuit and bar code reading apparatus employing
same
    91.
    发明授权
    Analog reconstruction circuit and bar code reading apparatus employing same 失效
    模拟重构电路和采用其的条形码读取装置

    公开(公告)号:US5294783A

    公开(公告)日:1994-03-15

    申请号:US819448

    申请日:1992-01-10

    IPC分类号: G06K7/10

    CPC分类号: G06K7/1092 G06K7/10851

    摘要: A bar code detection circuit accepts as input the discretized analog output of a CCD array, and performs piecewise linear reconstruction to produces a continuous polylinear output signal. In the region of a bar/space transition, the output signal is a close approximation of the reflectance function of a bar code symbol convolved with the system transfer function of the bar code reader. Linear interpolation is performed in order to determine the offset of a given threshold value from an edge of the CCD analog output.

    摘要翻译: 条形码检测电路接受CCD阵列的离散化模拟输出作为输入,并执行分段线性重构以产生连续的多线性输出信号。 在条形/空间转换的区域中,输出信号是与条形码读取器的系统传递函数卷积的条形码符号的反射函数的近似近似值。 执行线性内插以便确定给定阈值与CCD模拟输出边缘的偏移。