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CCD /
Cell /
Character /
Character Density /
Character Set /
Checkdigit /
Code Type /
Continuous /
CPI
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CCD
Charge Coupled Diode.
CCD readers use an array of hundreds of tiny light
sensors lined up in a row in the head of the reader. Each sensor measures
the intensity of the light immediately
in front of it. A voltage
pattern identical to the pattern in a bar code is generated in the reader
by sequentially measuring the voltages across each sensor in the row. The
important difference between a CCD reader and a pen or laser scanner is
that the CCD reader is measuring emitted ambient light from the bar code
whereas pen or laser scanners are measuring reflected light of a specific
frequency
originating from the scanner itself.
Cell
This term is used as a minimum unit of the 2-dimensional symbol.
Character
The combination of some black/white bars
to express each of alphabet, numeric, marks, etc.
Character Density
Generally given as the number of characters per inch
(cpi), This dimension is the length, in linear inches, required to encode one
character.
(See also CPI)
Character Set
The total number of characters (alphabetic, numeric,
symbols) that a certain bar code symbology can express. Some
character sets can express numerics-only, numerics and symbols,
numerics, alphabets and marks etc.
Checkdigit
Digits checked to determine if data scanned from the bar code is being misread. When
a character is scanned incorrectly,
usually caused by a void or spot on
the label, the checkdigits helps to determine that the information is, in
fact, incorrect.
(See the Checkdigit page for more information)
Code Type
There are two code types used for bar codes:
Continious type and
Discrete type.
Common continuous type bar codes include EAN,
Interleaved 2 of 5, CODE-93, CODE-128.
Its character density is high,
but is very difficult to print.
Common discrete type bar codes include,
NW-7 (CODABAR), CODE-39,
etc. Its character density is comparatively lower than other "higher-quality"
bar code symbologies and is easy to print.
- Continuous Type (Code-128):
- Discrete Type (NW-7 (CODABAR)):
(See continuous, and
discrete)
Continuous
One of two bar code, code types.
(See Discrete)
CPI
Characters Per Inch.
Is the number of
characters that will fit on an inch of a printed line.
(see character density)
CCD /
Cell /
Character /
Character Density /
Character Set /
Checkdigit /
Code Type /
Continuous /
CPI
A B C
D E F
G H I
J K L
M N O
P Q R
S T U
V W X
Y Z -
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