Method and apparatus for detecting edges in a signal obtained fr

Details Method and apparatus for detecting edges in a signal obtained fr Method and apparatus for detecting edges in a signal obtained fr

1995-01-04

1997-03-04

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

G06K 710

Patent

active

056082010

ABSTRACT:
A system for use in a bar code processing system using a combination of a first derivative signal and a second derivative signal to determine the bar edge. The predominant signal in determining the edge is the second derivative signal. A zero-cross of the second derivative signal occurs at the bar edge. The first derivative signal is used to qualify the point in time in the second derivative signal for which a zero-cross is examined the system is particularly suited for near filled operation.

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