Barcode technical term two

Encoded volume The maximum number of characters that can be represented in the barcode character set.

Bar code film master (bar code film master) Bar code film master.

One-dimentional bar code (linear bar code; one-dimentional bar code) only represents the bar code symbol of information in one-dimensional direction.

Two-dimentional bar code A bar code symbol representing information in a two-dimensional direction.

Special bar code (special bar code) Bar code made of special materials.

Barcode character value (character value) The one-dimensional bar code from the bar code logical conversion to the character set intermediate value.

Codeword (codeword value of two-dimensional barcode character.) The intermediate value converted by the logical expression of the barcode to the character set.

Error correction character The character of error detection and error correction in a two-dimensional barcode.

Error correction codeword (error correction codeword) The value of the error correction character in the two-dimensional barcode.

A composite code combines a linear symbol of the EAN · UCC system and a 2D (two-dimensional barcode) composite component.
Resolution: refers to the width of the narrowest unit that can be read by the reading device under test

Exit window of reading device: refers to the center point of the reading beam on the device closest to the reading end

Reading speed: reading times per second. Or the number of samples per second

First reading rate: when reading bar code symbols, the ratio of the number of readings that can be read for the first time to the total number of readings, this value is a statistic, usually obtained in the test

Decode redundancy (decode redundancy): refers to the pre-defined number of identical decodings before the device accepts a valid decoding. For example: if the decoding redundancy is 2, then the same decoding process is required twice

Reading angle: Before defining the reading angle, it is of great significance to understand how to define the three-axis coordinate axis of the space when using the reading device. When the bar code reading device reads the bar code symbol, we define the X axis to be parallel to the direction of movement of the reading beam and perpendicular to the direction of the bar height of the linear symbol. The Y axis is perpendicular to the direction of movement of the reading line and parallel to the direction of the bar height of the linear symbol. The Z axis is the direction orthogonal to the plane of the symbol that starts at the end of reading. The reading angle is the angle that the bar code symbol deviates from the three-dimensional coordinate axis of the space when it rotates around the coordinate axis. They are called: X-axis deflection angle, Y-axis deflection angle and Z-axis deflection angle.

Reading diagram: refers to the graphical representation of the reading area with a specific X dimension (or other parameter) barcode symbol. Reading charts can provide readers with a more intuitive representation of the performance of reading devices

Depth of field (depth of field): the vertical direction of the bar code symbol, or the distance range that the normal reading device can read the bar code symbol

Maximum reading distance (maximum reading distance): the distance from the end of reading to the upper limit of depth of field

Minimum reading distance (minimum reading distance): the distance from the end of reading to the lower limit of depth of field

Raster distance: The projection of the maximum distance between two adjacent reading lines in a space on a plane. The distance between the plane and the reading end of the reading device is determined

Raster width: The projection of the distance between the outermost two reading lines on the plane. The distance between the plane and the reading end of the reading device is fixed

Reading zone (reading zone): refers to all zones where the reading device (defined in the following section) can correctly read the specified bar code symbol

Grating (raster): Multiple approximately parallel beams are combined into a reading line. The reading line replaces a single light

Invisible code (cryptic symbol): Invisible code is a special bar code symbol that is specially processed to make the bar code symbol invisible. This type of symbol is invisible to visible light and the naked eye. Now it is mainly used in the production of cards and tickets

LED (light-emitting diode): short form of light-emitting diode

CMOS (Complementary Metal-Oxide-Semiconductor Transistor): abbreviated form of complementary metal oxide semiconductor

CCD (Charge Coupled Device): abbreviated form of charge coupled device

Print contrast (PCS): the percentage of the bar code symbol hollow reflectivity, the difference between the bar reflectivity and the empty reflectivity

Sign contrast (SC): read the difference between the highest reflectance and the lowest reflectance of the reflectance curve.