Harris Beach & Wilcox
Analog reconstruction circuit and bar code reading apparatus employing same
 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. 
Welch Allyn, Inc.
G G
G06K G06K
inventional inventional
Charles M. Andrew William H.
Hammond, Jr. Longacre, Jr. Havens