Rule based method and apparatus for processing reflectance signa

Details Rule based method and apparatus for processing reflectance signa Rule based method and apparatus for processing reflectance signa

1997-07-08

2000-01-25

Le, Thien M.

Registers

Coded record sensors

Particular sensor structure

235463, 23546201, 235467, 235487, G06K 710

Patent

active

060169605

ABSTRACT:
A method and apparatus employs a production system-like rule based routine to process signals, such as reflectance signals produced from machine-readable symbols (e.g., bar code symbols). Relevant features data is extracted from each peak or valley in the signal, such as width, height, and relative size. The routine then uses the extracted data for each peak and valley with a set of rules to refine the reflectance signals. Under one or more iterations, the routine selects and resolves conflicting rules and applies resulting rules to process the signal. The processed signal can then be more readily decoded. The routine preferably processes a reflectance signal in portions, such as on a codeword-by-codeword basis.

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