Method of estimating the mid-points of bar code elements

Details Method of estimating the mid-points of bar code elements Method of estimating the mid-points of bar code elements

1998-12-04

2000-08-08

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

23546225, G06K 710

Patent

active

060988835

ABSTRACT:
A method of estimating the mid-points of elements of a bar code, wherein the code is illuminated, and the light diffused by the code is picked up to generate in response a signal having a substantially alternating waveform profile defined by high-amplitude zones alternating with low-amplitude zones; each high-amplitude zone corresponding to a space of the code, and each low-amplitude zone corresponding to a bar of the code. The signal is then quantized to obtain a discretized waveform having a number of local maximum and minimum points, and an observation window of a given width is defined by which to observe the waveform. The observation window is positioned on the maximum and minimum points of the discretized waveform to eliminate redundant maximum and minimum points within the observation window.

REFERENCES:
patent: 5949054 (1999-09-01), Karden et al.
European Search Report Apr. 6, 1998.

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