Glossary of Terms
achieved width:
The actual element width based on measurements.
algorithm:
A set of steps guaranteed to effect a desired result by virtue of
mathematical proof. A set of steps without the proof is referred to as a
procedure.
alphanumeric:
A character set that contains alphabetic characters (letters),
numeric digits (numbers) and usually other characters such as punctuation
marks.
ANSI:
The American National Standards Institute. A non-governmental
organization responsible for the coordination of voluntary national (United States)
standards. http://www.ansi.org
aperture:
A physical opening that is part of the optical path in a device such as
a scanner, photometer, or camera. Most apertures are circular, but they may be
rectangular or elliptical.
aperture diameter:
The effective diameter of the optical system aperture.
Application Identifier (AI):
A UCC/EAN prefix that defines the meaning and
purpose of the data element that follows, as defined in ANSI/UCC4, UCC/EAN-
128 Application Identifier Standard.
Reference to be replaced with appropriate
ISO/IEC JTC 1/SC 31 reference, when available.
Application Standard:
Specification defining the method by which and
conditions under which automatic data capture technology may be applied to a
particular purpose, prescribing, for example, data formats, optical requirements
and symbologyrelated parameters that are subsets of the range defined by
relevant technical standards.
ASCII:
American Standard Code for Information Interchange: a computer code,
as described in ISO standard 646, consisting of 128 alphanumeric and control
characters, each encoded with 7 bits (an 8th bit may or may not be used to
include a parity check), used for the exchange of information between
computerized systems.
aspect ratio:
In a bar code symbol, the ratio of symbol height to symbol length.
In a two-dimensional symbol, the ratio of symbol length to symbol height.
autodiscrimination:
The ability of a bar code reader to distinguish automatically
between two or more symbologies (e.g., Interleaved 2 of 5, Code 39).
average background reflectance:
Expressed as a percent, the simple
arithmetic average of the background reflection readings from at least five
different points on a sheet.
39
Summary of Contents for Quick Check PC600
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