Bar code reading system for reconstructing irregularly damaged b

Details Bar code reading system for reconstructing irregularly damaged b Bar code reading system for reconstructing irregularly damaged b

1995-12-14

2000-03-21

Le, Thien Minh

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

060392525

ABSTRACT:
A bar code reading system capable of reconstructing irregularly damaged bar codes includes an input device such as an omnidirectional or CCD scanner, processors for determining whether the bar code symbol has been damaged, and a decoder. The scanner initially scans the bar code to determine the symbology that governs the bar code. Once the symbology has been obtained, an expected length for each symbol can be calculated. The scanner then individually scans each symbol and compares the symbol's length to its expected length. If the lengths differ by a significant amount, the symbol is assumed to be damaged and information about the elements of each symbol are stored in memory. The scanner then scans in a reverse direction and stores information about the symbol in memory. A processor then determines all of the possible permutations of element widths from the stored information. Each permutation is checked against all possible decoded symbols until a single, decodable symbol is found.

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