Analog reconstruction circuit and bar code reading apparatus employing same
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United States of America Patent
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Mar 15, 1994
Grant Date -
N/A
app pub date -
Jan 10, 1992
filing date -
Jan 10, 1992
priority date (Note) -
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Abstract
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.
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