# Barcodes principle. Identification systems (IDFS) Department of Control and Telematics Faculty of Transportation Sciences, CTU in Prague

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1 Barcodes principle Identification systems (IDFS) Department of Control and Telematics Faculty of Transportation Sciences, CTU in Prague

2 Contents How does it work? Bulls eye code PostNet 1D Bar code 2D Bar code 2

3 Bulls eye code PostNet 1D Bar code 2D Bar code HOW DOES IT WORK? page 3

4 Bulls eye code Bulls eye code 4

5 Bulls eye code page 5

6 Bulls eye code Reader output page 6

7 Bulls eye code PostNet 1D Bar code 2D Bar code HOW DOES IT WORK? page 7

8 PostNet PostNet code 8

9 Bulls eye code PostNet 1D Bar code (UPC/EAN/GS1 DataBar/ ) 2D Bar code HOW DOES IT WORK? page 9

10 ? CODE 2 of 5 Composition Every character of this code, excluding start and stop character, is formed by 5 bars (2 wide + 3 narrow), every character is represented by same width in the barcode. Parallel spaces between bars have same width (do not cary information) page 10

11 ? UPC code Composition The scan able area of every UPC-A barcode follows the pattern SLLLLLLMRRRRRRE, where the S (start), M (middle), and E (end). The L (left) and R (right) sections collectively represent the 12 numerical digits that make each UPC unique. The first digit L is the prefix. The last digit R is an error correcting check digit, the guard bars, separate the groups of six digits L/R = 7 modules, S/E = 3 modules, M = 5 modules total 95 modules of the same width page 11

12 UPC Code How to read bars? Each digit: four vertical lines, two black and two white. (7 modules), L and R have reversed values (color) page 12

13 Bulls eye code 1D Bar code 2D matrix code (PDF417/DataMatrix/QRCode/ ) HOW DOES IT WORK? page 13

14 PDF-417 Composition: size of the symbol can be modified multiple linear bar-codes stacked above Symbol = ratio of the widths of the bars and spaces to each other maximum of 90 rows and 30 columns capable of storing up to 2710 digits (1850 aflanumeric chars, 1108 bytes) 14

15 PDF-417 Code word: 4 bars and 4 spaces which totals 17 modules in width. Each bar and space can be from 1 to 6 modules in length. In theory it has 9*929 patterns. Each set of 929 patterns is called a cluster (character set). PDF417 only uses cluster number 0, 3 and 6. Adjacent rows use different clusters in the sequence 0, 3, 6, 0, 3, 6 page 15

16 PDF-417 The CW number 900 to 928 have special meaning, some enable to switch between modes in order to optimise the code. page 16

17 PDF-417 Start and stop pattern (static and are the same for all barcodes) Left and right row indicators (chosen to achieve maximum contrast, also bear row number and error correction level) Data and data count (unique for each barcode and represents the encoded data, numeric, alpha, ) Error correction codewords (2 min, 510 max) page 17

18 PDF-417 Example: First CW indicates CW total number of the code including: data, CW of stuffing and itself but excluding CW correction. Sample of code with 14 data CW, a 15th CW indicate CW number, one padding CW and 4 correction CW. (Level 1) Structure D15 = length descriptor (16 in this sample) D0 = padding D1 a D14 = data L1 a L10 = left side CW R1 a R10 = right side CW C0 a C3 = error correction, level 1 page 18

19 PDF-417 Example: 4 different character sets: Each CW encode 2 characters ; if C1 and C2 are the values of the two characters, CW value is : C1 x 30 + C2 If it remains an alone character, we add to it a padding switch, for instance T_PUN. page 19

20 PDF-417 The "Byte" mode allow to encode 256 different bytes, that is the entire extended ASCII table. page 20

21 PDF-417 Left and right side CWs are computed according to the table used for the actual row. To obtain the CW value, make the following calculation : (Row Number \ 3) x 30 + X with X taken in the following table. (First row is row number 0) page 21

22 Bulls eye code 1D Bar code 2D matrix code (PDF417/DataMatrix/QRCode/ ) HOW DOES IT WORK? page 22

23 GS1 - DataMatrix Composed of two separate parts the finder pattern (to locate the symbol), and the encoded data itself Finder Pattern defines the shape, the size, X-dimension and the number of rows and columns in the symbol. has a function similar to the Auxiliary Pattern in an EAN-13 The solid dark: L finder pattern is used to determine the size, orientation and distortion of the symbol. Dashed lines: Clock Track defines the basic structure of the symbol and can also help determine its size and distortion. page 23

24 GS1 - DataMatrix Symbol structure Number of rows and columns variable from 10 to 144 lines Example: Symbol size 10x10 + quiet zone 2 = 12 lines/collumns Data part: 8x8 = 8 code words (3 data / 5 error correction) page 24

25 GS1 - DataMatrix Symbol structure Divided into data regions, matrix 32x32 into 4 14x14 regions Data unit 8 bits = code word Error correction Variable, Reed-Solomon error correction Calculates complementary codes and add-ins Reconstitutes the original encoded data by recalculating the data from the complementary codes and add-ins. The recalculation regenerates the original data by locating errors at the time of scanning. page 25

26 GS1 - DataMatrix Encoding example: char: Data encoding: The ASCII encoding converts the 6 characters into 3 bytes. 12, 34 and 56 (x+130) = = 3 data code words Error correction: (RS algorithm) 5 error correction code words: page 26

27 GS1 - DataMatrix The final matrix would be: page 27

28 GS1 - DataMatrix page 28

29 Bulls eye code 1D Bar code 2D matrix code (PDF417/DataMatrix/QRCode/ ) HOW DOES IT WORK? page 29

30 QR code page 30

31 QR code Symbol structure Number of rows and columns variable from 21 to 177 lines Data unit 8 bits = code word Format info 2x (encoded BCH) page 31

32 QR code Structure page 32

33 QR code Encoding Data page 33

34 QR code Masking data: page 34

35 QR code Try it yourself page 35

37 5. Readers A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. It consists of a light source, a lens and a light sensor translating optical impulses into electrical ones. Additionally, nearly all readers contain decoder analyzing the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port. 37

39 BENEFITS page 39

40 6. Benefits Can provide detailed up-to-date information on the business, accelerating decisions and with more confidence. For example: Fast-selling items can be identified quickly and automatically reordered. Slow-selling items can be identified, preventing inventory build-up. The effects of merchandising changes can be monitored, allowing fastmoving, more profitable items to occupy the best space, Historical data can be used to predict seasonal fluctuations Items may be repriced on the shelf to reflect price increases. This technology also enables the profiling of individual consumers, typically through a voluntary registration of discount cards. Besides sales and inventory tracking, barcodes are very useful in logistics. 40

41 Závěr 41

42 5. References History of development of barcode Interviews with inventors Barcodes specification Summary of barcodes Collection of information about barcodes Changing color barcode All about QR codes en.wikipedia.org/wiki/qr_code 42

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