| 摘要 |
Printed characters, superimposed upon a contrasting center bar extending through a character field, are identified by scanning each character along a plurality of vertically aligned laterally spaced paths to generate character signals dependent upon encountering a character portion. The center bar is sensed to generate a control signal. In response to the character signal and the control signal an output signal is produced. In a preferred mode for alphanumeric characters white signals and black signals representative of white and black fields at each of a plurality of points along each said path are generated. The signal from each given point is compared with signals representing points immediately above, immediately below and next most remote, with reference to the center bar, to modify the signal from the given point and thereby generate enclosed point signals when any white field is within a boundary formed by a black character portion and the said center bar. The enclosed point signals for a plurality of separate zones of said field are compared with a code for each symbol to produce character identification signals. The number of crossings of the center bar, projection signals dependent upon the projections onto the center bar, and crossing signals representative of the number of crossings by the character of a vertical line spaced to one side of the center bar are selectively employed.
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