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Aztec code is a type of barcode.  It is a 2- Dimension barcode. Aztec code is used for reduce the space when compare with the other barcode matrix. Aztec code is a symbol, which is built on a square grid with a bulls-eye pattern. Bulls-eye has 9*9 or 13*13 pixels. Aztec code is generated by using the encoding scheme.
All type barcode Grenerator

Barcode Generator

Aztec code:
Aztec code is a type of barcode.  It is a 2- Dimension barcode. Aztec code is used for reduce the space when compare with the other barcode matrix. Aztec code is a symbol, which is built on a square grid with a bulls-eye pattern. Bulls-eye has 9*9 or 13*13 pixels. Aztec code is generated by using the encoding scheme.

Encoding:

  1. The following steps are used for generating Aztec code.
  2. Convert original data to string of bits.
  3. Compute the size of code with the help of Reed-Solomon codeword size.
  4. Insert the non information bit into Reed-Solomon codeword.
  5. Adding the message to code word.
  6. Arrange the code word message in a spiral around the core.

Code 39:
Code 39 is a variable length barcode. Code 39 can be specified by 43 characters. 43 characters are uppercase letters (A- Z), numeric digits (0 - 9) and special characters (-, $, /, +, %, and space).The starting and ending code is specified by additional character asterisks (“*”). Each character contains nine elements (5 bars and 4 spaces).  3 elements of each character are denoted by binary value “1”. Remaining 4 elements of each character are denoted by binary value “0”.


Code128:
Code128 is a high density barcode. It is used for Alphabetic and numeric character or only numeric barcode. Code128 can be generated using the encoding scheme with the help of 128 ASCII Character. Code 128 includes 108 symbols (103 - data symbols, 3 – start symbols, and 2 - stop symbols).
The code 128 barcode contain six section
1. Quiet space
2. Starting symbol
3. Encoding character
4. Check Character
5. Stopping symbol
6. Quiet space

Quiet space:
 Quiet space is a minimum space, which is in the left and right of the barcode. It is in left side of the starting and right side of the ending symbol.  The quiet space must not be less than 4mm-1.65mm depend on the type of barcode.

Starting and stopping symbol:
Starting and stopping symbol is containing 3 white space and 3 bars. Starting symbol is in the next of Quiet space at left side. And stopping symbol is in the previous of Quiet space at right side.

Encoding character:
Each character in the barcode has 1, 2, 3 or 4 units wide. The total unit of each character is 11 units. The bars are specified by “1”. The spaces are specified by “0”. The sum of unit of white space should be “Even”. The sum of unit of bars should be “Odd”. If the 3 bars are continually present, then bars look like a thick 1 barcode.

Check character:
Check character is a mod of 103 checksum. It is calculated by sum of starting code value (indicate’103’) to product of the each character value, and the multiply by position of character in the barcode string.


Data matrix:
Data matrix is a type a barcode. It is a 2 Dimensional barcode. It is a collection of cells (black and white). Shape of the data matrix is square or rectangular pattern. The black cell is indicating by “0”. The white cell is indicating by “1”. The data size is up to 1556 byte.  Data matrix has two “L-shape” borders with the black color. This is called finder pattern. Finder pattern is used for locate the symbol. Remaining two sides has border with alternative black and white cells. This is called timing pattern. Timing pattern is used for count the no of rows and columns. In the old version ECC 000 – 140, the data matrix size must be 9×9 to 49×49. In the new version ECC 200, the data matrix size must be 10×10 to 144×144. Each symbol is unique.

Uses:

  • The data matrix is used in the label and letters.
  • The code of data matrix can be easily read by the barcode reader.
  • In food industries, data matrix code are used for prevent the packing food. That is data matrix code of the expiry date can be printed on the packing food.


Sample Data Matrix:


Ean-8:
      Ean-8 is a type of barcode. It has 8 digit barcode, (7 digits are numeric, and 1 digit is checksum). It is composed by European Article Number (EAN-13) code.
How to calculate the checksum:
1. Writes the digit in reverse order.
2. Calculate the sum of odd digits from the left side to right side.
3. Calculate the sum of even digits from the left side to right side.
4. The following formula is used to calculate the checksum digit.
(10 - [(3 * Odd + Even) modulo 10]) modulo 10


Example:
1. Ean-8 code is 9876543.
2. Reverse code is 3456789
3. Sum of odd digits is 24 (3+5+7+9).
4. Sum of even digits is 18 (4+6+8).
5. Calculate the checksum:
(10 - [(3 * Odd + Even) modulo 10]) modulo 10
(10 - [(3 * 24 + 18) module 10]) modulo 10
(10 - [(72 + 18) module 10]) modulo 10
(10 - [(90) modulo 10]) modulo 10
(10 - [0]) modulo 10
(10 - 0) modulo 10
10 modulo 10
0
Ean-8


ITF-14:
        ITF-14 stands for Interleaved Two of Five.  It is a type of barcode. It is used to print the packing product. ITF-14 has 14 digits symbol. The thick border is around to the ITF-14 barcode. This thick border is called the Bearer Bar. Bearer Bar is used to adjust the pressure of packing plate. And is used to reduces the misreading when the scanning. ITF-14 has 13 numeric data and 1 checksum. If the given code is less than 13 digits, then the system can add “0” to right side of the given code for adjust the 13 digits code.

MSI:
MSI is a type of barcode. And it’s known as Modified Plessey. MSI barcode is composed by MSI Data Corporation, based on the original Plessey Code symbology. It is not self checking code. It is a variable length barcode. Each character has 8 elements (4 bars and 4 spaces). It is only accept the numeric data, but not alphabetic data. It’s represented by numeric character (0-9).

PDF-417:
       PDF stands for Portable Data File. It is a linear barcode.417 consists of 4 bars and spaces, and the length of pattern is 17. It can be used for the postal service. It is a 2-D barcode. It is a one of the format of Data Matrix. It’s a machine readable barcode. It’s used in the driving license. This barcode can be read by using the linear scanner. This barcode has a codeword. The codeword are encoded based on 929. Each codeword is specified by 0 to928. Codeword are represented by bars and spaces. Each codeword consists of 4 bars and 4 spaces.

QR code:
QR code stands for Quick Response Code. It is a 2-D matrix barcode. First QR code is composed by automotive industry in Japan. QR code can be read by camera as the scanner. It has designed by black square cell with the white background space. It is a label for printed on product trademark. This QR code can be efficiently stored the date and information about the product. The applications for the QR code are product tracking, item identification, time tracking, document management, general marketing. The smart phone is used for capture the QR code and converts the code into some useful information. QR code is commonly used for customer advertising. QR code can be generated based on the DES algorithm. The Japanese immigration system uses encrypted QR codes when issuing visa in passports. The size of QR code is module of 0.03 inches (0.76 mm).

UPC-A:
UPC-A stands for Universal Product Code. It is a type of barcode. It is used in the United States, Canada, the United Kingdom, Australia, the New Zealand, and in other countries for tracking trade items in stores. This barcode has only 12 numerical digits but not used alphabetical characters. Each digit has 4 elements(2 bars and 2 sapces).









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