Barcode decoders allow machines to read barcode information by translating the patterns of bars and spaces into digital data. The presentation discusses the history and types of barcodes, including 1D and 2D formats, and explains how barcode readers work by scanning codes with a light sensor and using decoder circuitry to analyze the image and extract the encoded data. Applications of barcodes are also reviewed, noting their common use for identification in retail, warehousing, and healthcare. While barcodes provide benefits like speed and data accuracy, disadvantages include delays if the system fails or codes are damaged.

1. Barcode
Decoder
Presented By-
Arijit Dhali
Ipsita Raha

2. Prologue
Introduction of
barcode decoder
All about barcode
reader
Defining barcode
reader and its type
Neccesities
Applications and
advantage-disadvantage
Contents
All about Barcode
Defining barcode and
mentioning its type
Technico
All about interface
and way of decoding
Epilogue
Contains conclusion
and bibliography

3. Introduction
This presentation give an informative
data on Barcode and Barcode Reader.
Barcode Reader help us understanding
the inner workings of 1D and 2D codes
The barcode was invented by
Norman Joseph Woodland and
Bernard Silver and patented in the
US in 1951.
It was while working as an electrical engineer
with IBM that George Laurer fully developed
the Universal Product Code (UPC), or
barcode. He developed a scanner that could
read codes digitally.

4. A barcode, consisting of bars and spaces, is a machine-
readable representation of numerical and characters.
The bars are typically black on a white background, and their
width and quantity vary according to application.
The bars are used to represent the binary digits 0 and 1,
sequences of which in turn can represent numbers from 0 to 9
and be processed by a digital computer.
The presence or absence of a bar of a particular width in a
particular position in a sequence is read by the computer as
either 0 or 1.
Barcode

5. Barcode could be distinguished into 2 types:
 1D Barcode - Consist of vertical bars only
 2D Barcode - Consisting boxes as well called modules
There are 4 types of 2D Barcode:
• QR Code
Have distinct 3 squares on any four corners
• PDF417 Barcode
Consisting of vertical bars at start and end
• Data Matrix Barcode
Has solid lines on bottom and left edge along with boxes
• Aztec Barcode
Has a square grid with bullseye pattern in center
Types of Barcode

6. Barcode Reader
A barcode reader is an optical scanner that can
read printed barcodes, decode the data content
in the barcode and send the data to the
computer.
It consists of a light source, a lens and a light
sensor translating for optical impulses into
electrical signals. Additionally, nearly all barcode
readers contain decoder circuitry that can
analyze the barcode’s image data provided by
the sensor and sending the barcode’s content to
the scanners output port.

7. Types Of Barcode Reader
Pen Wand
Slot Scanner
CCD Scanner
Image Scanner
Laser Scanner

8. Inerfacing
1) Scanning
Scanning the code with light
sensor
4) Analysing
Digital signal is coverted to
binary data
2) Analog Signal
Area of lines converted to
analog signal
3) Digital Signal
Converting analog signal to
digital signal
5) Storing Database
The data is stored in a for
database management
6) Cloud Share
The database is shared
throughout the internet

9. 1
2
3
4
5
Decoding Barcode
Add the digits (excluding check digit) at odd-
numbered positions then multiply by 3
Add the digits (excluding check digit) at
even-numbered positions
Then add two results to find the sum
The check digit will be the smallest number required
to round the sum to the nearest multiple of 10.
Demonstration:
(0+2+0+0+2+0)x3 = 12 >>> (1+0+0+0+3) = 4
>>> (12+4) = 16 >>> (20-16) = 4 = Check Digit
0 1 2 0 0 0 0 0 2 3 0

10. Applications
 Retail Application
• Super markets
• Counter-mounted Bar Code scanners
• Universal Product Code (UPC) Price
and description information
 Ware Housing
 Health Care Applications
• Drugs, Devices, Instruments
• Identification of Expiry Date
• Knowledge of Blood Banking

11. Advantages V/S Disadvantages
• Time efficient
• Reads data accurately
• Data Integrity
• Ease of Implementation
• Cost Effectiveness
Advantages Disadvantages
• Delay when system fails
• Couldn’t read when
barcode gets destroyed
• Could read only barcode
• Laser Scanning are
costly and non-durable
• Can take faulty reading if
misused

12. Conclusion
From the presentation we can conclude:
 Positive Impact On Daily Life.
 Have Lots Of Advantages With Minor Bottlenecks.
 It Has Its Versatile Uses & It’s User Friendly.
 Laser Emission Near Or On Human Body Is Very Harmful.

13. References
• https://barcode-labels.com/you-can-learn-read-barcode/
• https://www.slideshare.net/prashantb11/barcode-reader-
44594801?qid=6d30b4c1-34c0-477e-9bfd-
938966282491&v=&b=&from_ search=2
• https://www.britannica.com/technology/barcode
• https://en.wikipedia.org/wiki/Barcode_ reader
• https://www.denso-
wave.com/en/adcd/fundamental/barcode/scan/index.html
• https://www.dynamsoft.com/blog/insights/best-practices-for-
maximizing-barcode-reader-technology-3-6/
• Barcode Recognition System by Norhashimah Mohd Saad

14. Thank
You !
For your attention towards
our presentation