Method of detecting and reading postal bar codes

Details Method of detecting and reading postal bar codes Method of detecting and reading postal bar codes

1987-04-17

1989-04-18

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235456, 235470, G06K 710

Patent

active

048229865

ABSTRACT:
A Bar Code Reader of a Video Processor Unit receives video data from a scanner and processes it to locate a bar code at the bottom of a document which represents a postal zip code. The scanner generates an array of cells of video data and provides each cell with a gray weight value corresponding to a detected blackness level of a small portion of the scanned document. The Bar Code Reader moves a template mask over the array and calculates area sums of gray weight values for cells within predetermined areas of the template mask. The area sums are used to compute Bar scores for determining the presence and position of tall and short bars in a bar code field. The positions of the tall and short bars in the bar code field are translated into postal zip code information.

REFERENCES:
patent: 4408344 (1983-10-01), McWaters et al.
patent: 4760247 (1988-07-01), Keane et al.

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