Bar code grade standards and technical requirements
Bar code is a group of bars and empty symbols arranged according to certain coding rules, used to represent certain characters, numbers and symbols composed of information. Bar code system is an automatic identification system composed of the design, production and scanning of bar code symbols.
Bar code symbol standard
Each bar code symbol (that is, a code system) has a standard, which defines and describes the coding scheme and decoding algorithm of the bar code symbol, and puts forward certain requirements for the technical parameters of the bar code symbol. These requirements are the basic requirements of the bar code symbol, the bar code symbol should first meet the bar code symbol standards. These standards include: 39 bar code standard, UCC/EAN-128 bar code standard, etc.
Bar code grading standards and technical requirements
According to the bar code detection curve parameters (minimum edge ratio, decoding, bar space contrast, decoding ability, defect degree) of the lowest level of the evaluation level is the level of the curve. The grade of each parameter and the grade of the scanning reflectance curve are represented by letters A, B, C, D and F, corresponding to 4, 3, 2, 1 and 0 in the national standard respectively. The national standard requires the symbol grade to be no less than 1.5/10/670, where: 1.5 is the whole symbol quality grade; 10 is the reference number of measuring aperture; 670 is the high reaction wavelength in nanometers.
Grade A barcode corresponding symbol quality level: 4.0-3.5;
B bar code corresponding symbol quality level: 3.4-2.5;
Grade C barcode corresponding symbol quality level: 2.4-1.5;
D bar code corresponding symbol quality level: 1.4-0.5.
Grade F: Unable to read
The grade of the bar code symbol indicates its printing quality and application:
Class A bar codes are usually well read and are suitable for a variety of occasions.
B-level barcodes do not perform as well in the reading process as A-level barcodes, and symbols may need to be scanned repeatedly.
Grade C bar code usually requires the use of repeated scanning and has a special multiple scan line equipment to obtain good reading effect.
Level D bar codes may not be readable by some reading devices.
F grade bar code is unqualified product, can not be used.