The document presents an introduction to QR codes, explaining their origin, functionality, and benefits such as high-speed recognition and error correction. It details the differences between 1D and 2D barcode technologies, how QR codes are generated, and the necessity of special applications for decoding. Additionally, it discusses the encryption and error correction methods used in QR codes to ensure data integrity.

1. S. M. Rakibul Islam Ratul
ID: 181-15-10869
Presentation
Presenter
On
QR Code

2. Introduction
QR code is a kind of matrix 2D barcode designed by Denso-Wave
Corporation of Japan in 1994 for automotive industry.
Its benefits are high-speed recognition, strong error-correction
capability. It is more advanced bar coding system, barcode is
machine readable optical label that contain the information about
the item which it is attached. QR codes works in the barcodes
technology and it consist of black square dots on white
background.
What is QR code?

3. Barcode Technology
QR codes work on the barcode technology. Barcodes originally
were scanned by special optical scanner called Barcode reader.
There are two types of Barcode Technology
1D Barcode
 Use only length
 Height is for scanning
convenience
 Read by leaser
 30 ASCII characters
2D Barcode
 Stores data in length/height matrix
 Read by an image scanner [CCD or
camera]
 7089 characters

4. 2D Barcode
How it works?
QR Code
generator
Print or Link
User connect with
smartphone or computer
It requires a QR scanner application which is to be installed in
smart phone or computer to decode the information in QR
code.
Where white
represent 0 and
black represent 1
Made of

5. 1
3
4
2
How QR codes are
built
To detect the
position and rotation
of the code
Timing
structure
Format of the
data
Mask of the
data

6. 5
7
8
6
How QR codes are
built
Error correction for five
bits
Single bit
Type of encoding
the data is stored
Message length

7. 9
10
How QR codes are
built
Message
Error correction
QR Code

8. QR code
QR Code
S. M. Rakibul Islam
Ratul
ID: 181-15-10869

9. Used Algorithms
Encryption
 Encrypted QR codes, which are not very common, have a few
implementations.
 The QR App, manages encryption and decryption of QR codes
using the DES algorithm.
Error correction
 It has a function of an error correction for miss reading that
white is black.
 It use the Reed-Solomon error correction algorithm with four
error correction levels.
 Capacity of a QR code is determined by version, error
correcting level and encoding mode.

10. T H A N K S F O R W A T C H I
N G