Jacob A Apelberg

US Patent:

58616136, Jan 19, 1999

Filed:

Oct 8, 1997

Appl. No.:

8/947066

Inventors:

Jacob Apelberg - Baltimore MD
Klaus W. Berndt - Stewartstown PA

Assignee:

Becton Dickinson and Company - Franklin Lakes NJ

International Classification:

G06K 710

US Classification:

235464

Abstract:

A system evaluates the data derived from scanning a circular bar code element. The elements in the circular bar code extend radially outwardly from a center of the label, and their width varies along the radial direction. For that reason, should a circular bar code reader be offset relative to the center of the label, it is possible that the circular bar code reader would develop analog signals of the width of elements that vary within a single scan. At one location on the label, an offset reader may read one analog signal for a wide element, and at another location may read a wholly different signal for a wide element with an identical width. To address this problem, an element under evaluation is compared to adjacent elements, and a determination is made of whether the particular element is wide or narrow. Any offset will cause minimal variation in adjacent elements. Several methods for using this basic concept are disclosed.