Barcode knowledge

Barcode knowledge

1. Bar code The bar code consists of a set of regularly arranged bars, spaces and their corresponding characters. It is used to represent certain information.

2. Bar code system A system composed of bar code symbol design, production and scanning and reading.

3. Reflectance; reflectivity The ratio of reflected light intensity to incident light intensity.

4. Diffuse reflection deffuse reflection The phenomenon of light projected on a rough surface reflecting in all directions.

5. Specular reflection The phenomenon of light projected on a smooth surface reflecting in all directions.

6, bar bar; dark bar; black bar bar code part of the lower reflectivity.

7. The empty space; light bar barcode has a higher reflectivity.

8. Start character; start cipher; start code A number of bars and spaces at the beginning of the bar code.

9. Stop character; stop cipher; start code A number of bars and spaces at the end of the bar code.

10. Clear area; quiet zone; quiet area; clear zone A limited area where the outer side of the bar code start and end symbols has the same reflectivity as the empty.

11. The bar code symbol includes the bar code in the blank area.

12. Character set The set of letters, numbers and symbols that character seet barcode symbols can represent.

13. The central seperating character is located in the middle of the barcode to separate the data segment from the blank.

14. Separator A special character in the coded character set that acts as a separator.

15, bar code character bar code character represents a number of characters or symbols and empty.

16. Bar code character set A set of bar code characters that can be represented by a certain bar code.

17. Bar code data character bar code data character represents the bar code character of specific information.

18. Bar code check character bar code check character represents the bar code character of the check code.

19. Bar code filler character does not represent the bar code character of specific information.

20. The element element constitutes the bar or space of the bar code character.

21. Bar height bar height The height dimension of the bar perpendicular to the width direction of the unit.

22. Bar width bar width The width dimension of the bar code character.

23. Empty width space width The empty width dimension of bar code characters.

24. Bar width ratio The width ratio of the widest bar to the narrowest bar in the bar code.

25. Space width ratio The width ratio of the widest and narrowest spaces in the barcode.

26. X dimension

X The nominal size of the narrow unit in the bar code symbol.

27. Z dimension

The actual size of the narrow element in the Z bar code symbol.

28. width to narrow ratio

N The sum of the width of the average wide bar and the width of the average wide space (bar code character spacing is not included) divided by twice the Z size. It is width-adjusted

Technical parameters in the section coding method.

Calculation formula: N = (bar width of average wide bar + space width of average wide bar) / 2Z

29. Bar code length The length from the leading edge of the bar code start character to the trailing edge of the bar code length.

30. The length of the bar code symbol bar code symbol length; symbol length includes the length of the bar code to go blank.

31. Feature ratio The ratio of the barcode length to the height of the aspect ratio.

32. Bar code density The number of bar code characters represented by the unit length bar code.

Note: It is usually expressed in CPI, that is, the number of barcode characters that can be expressed per inch.

33. Bar code character interval inter-character gap The area between adjacent bar code characters that does not represent specific information and has the same reflectivity as the empty area.

34. The module module is combined with the coding method to form the basic unit of bar code characters.

35. The protective frame bearer bar surrounds the bar or the side or frame with the same reflectivity as the bar.

36. Continuous bar code continuos bar code Bar code without bar code character interval.

37. Discrete bar code discrete bar code Bar code with bar code character interval.

38. Bi-directional bar code Both ends of the bar code symbol can be used as the starting point of the scan.

39. The additional barcode add-on indicates the barcode of the additional information.

40. odd-even check The method of checking according to the number of 0 or 1 in the binary digits is odd or even.

41. Self-checking bar code The self-checking bar code bar code character has a check function.

42, fixed length bar code fixed length of bar code bar code with a fixed number of bar codes.

43. Unfixed length of bar code Unfixed length of bar code The number of bar code characters is not fixed.

44. Width adjustment coding method The bar code encoding method in which the bar and space in the bar code symbol is composed of wide and narrow units.

45. Module combination encode The code combination method of the bar code symbol consists of a specified number of modules.

46. ​​Binary-code binary-edge-code Two unit width barcodes are barcode characters composed of two width units.

47. Multi-element code four-edge-code A variety of unit width barcodes are barcode characters composed of three or more width units.

48. odd arrangement odd permutation; odd parity module combination coding method, the sum of the number of modules contained in a bar code character is an odd arrangement.

49. Even arrangement even permutation; Even parity module combination coding method, the sum of the number of modules contained in a bar code character is an even arrangement.

50. Bar code logic value Bar code logic value uses binary "0" and "1" to represent the bar code character expression.

51. The maximum number of characters that can be represented in the encoded volume barcoded character set.

52. Bar code film master bar code film master.

53, one-dimensional bar code linear bar code; one-dimentional bar code only represents the bar code symbol of information in one-dimensional direction.

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

55. Special bar code Special bar code Bar code made of special materials.

56, bar code character value character value One-dimensional bar code from the bar code logical expression to the intermediate value of the character set conversion.

57. Codeword The value of the two-dimensional barcode character. The intermediate value converted by the barcode logical expression like character set.

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

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