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CCD
Charge Coupled Diode. Memory device which
convert the light to the electric signal by the matrix of
many particles on the silicon basis. Used for the barcode
recognition by the hand scanner.
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
The maximum of readable characters
in the regular length. (See CPI)
Character Set
the type of characters that
the barcode can express.
There are some character sets such as numerics-only, numerics
and marks, numerics and alphabets and marks, including full-ASCII
control code, variable according to the type of the barcode.
Checkdigit
The checking digits for avoiding the misreadings.
When the character is recognized as another,
by the influence of the void
or spot, the checkdigit
helps to find it, if added.
Code Type
There is two code type in barcode:
Continious type and Discrete
type. In continuous type, there are EAN,
Interleaved 2 of 5, CODE-93, CODE-128. Its character
density is high, but it is difficult to print. In discrete
type, there are CODABAR, CODE-39, Straight 2of5, etc. Its
character density is comparatively low, but it is easy to
print; so often printed by personal printer, and used for
number printing. (See continuous, discrete)
Continuous
Continuous type is one of the code
type of barcode.
The last space character
has a meaning, as a white bar. (See Discrete
code type)
CPI
Characters Per Inch. The maximum characters
of readable size, in 1 inch. (see character
density)
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