Glossary
G–2
C
CCD
Acronym for Charge Couple Device;
a linear image sensor that scans at
high speeds (approximately 4,000
times per second) and detects the
presence or absence of marks passing
under the device.
character
A single group of bars and spaces
representing an individual number,
letter or punctuation mark. A
graphic shape representing a letter,
number or symbol.
character alignment
The vertical or horizontal position of
characters with respect to a given
reference line.
character density
The dimension, in linear inches,
required to encode one character.
character reading
Reading of alpha or numeric
characters,and/or symbols, by optical
means.
character set
Those characters available for
encoding purposes.
character skew
See skew.
character spacing
The horizontal distance between two
adjacent characters.
check digit
A digit included within a symbol
whose value is based mathematically
on other characters included in the
symbol. It is used to mathematically
check the accuracy of the read.
clear area
A clear space, containing no dark
marks, that precedes the start
character of a symbol and follows
the stop character. That region of a
document reserved for OCR
characters and the required clear
space around these characters.
code
A set of rules governing how the bars
and spaces of the symbol will
represent characters and groups of
characters. bar code.
code medium
The material used to construct a
machine readable code. Such
materials may be retroreflective or
opaque.
code reader or scanner
A device that examines a spatial
pattern, one part after another, and
generates analog or digital signals
corresponding to the pattern.
contact scanner
A code reader that requires physical
contact with the code medium.
continuous code
A bar code or symbol that does not
use an intercharacter gap between
characters in the code. Code 128 is
an example of a continuous code.
D
decoder
A device used to decode, or make
usable, a digital or analog signal
transmitted from a scanning device.
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