Quick Response Code (QR code)
- 1. ‘QR’ code Presented by: ADITYA JHA Section “A” (BSC Hons Computing) 1
- 2. BAR CODE What is a barcode? A barcode is an optical machine readable representation of data relating to the object to which is attached. 2
- 3. Quick Response Code 3 What is a QR code? A two dimensional bar code which is widely used to encode & provide easy assess to information.
- 4. QR Code 4 The QR code system was invented in 1994 by Toyota’s subsidiary, Denso Wave. Initially used to track vehicles & for tracking parts during manufacturing. Now its’s also used to easy share the link and transfer information on smartphones. The information on a QR code is typically some sort of actionable text that directs the phone to take some sort of action
- 5. How it works? 5 It requires a QR scanner application which is to be installed in smart phone or computer to decode the information in QR code. QR code generator Print or link User connects with smart phone or computer
- 6. 6 QR code are made up of black squares and white squares. Each of these squares is called a module. In every QR code, there are certain modules that must not be covered or edited, else the code won’t scan.
- 7. Encryption 7 Error correction 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. It has a function of an error correcting for miss reading that white is black. It use the Reed-Solomon error correction algorithm with four error correction levels. Capacity of a QRcode is determined by version, error correcting level and encoding mode.
- 8. 8 Level L (Low) 7% of codewords can be restored. Level M (Medium) 15% of codewords can be restored. Level Q (Quartile) 25% of codewords can be restored. Level H (High) 30% of codewords can be restored.
- 9. Decryption 9 The three large square highlighted in red are the position markers. These tell the scanner where the edges of the code are.
- 10. 10 The smaller red square is an alignment marker. The red strips of altering black and white modules are called timing patterns. They define the positing of the rows and column. The green sections determine the format. This tells the scanner whether it’s a website, text message, Chinese symbols, numbers, or any combination of these. The modules highlighted in blue represent the version number.
- 11. Version of QR code 11
- 12. Scanning a QR code 12 The information is read by a mobile phone equipped with a QR code reader, which works in conjunction with the phone’s camera to decode the information.
- 13. Uses 13 URL: A QR code can be used to encode the text of a URL, which will be opened a web browser. Telephone Number: A QR code may also contain a phone number. When a code is read the phone’s dialer will open with the number filled in, and also the QR code can automatically place the call by asking permission. SMS: A QR code may contain a number that is ready to receive a text message. The QR code reader would promote the phone to open the messing client, and would open a new message that the user can compose and send. The QR code can store up to 4,296 alphanumeric or 7,089 numeric characters.
- 14. QR Code Readers Apps 14 QR Code Reader for Cell Phones: Kaywa Beetagg QR Code Reader for Computers: NeoReader QuickMark
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- 16. Reference- http://en.wikipedia.org/wiki/QR_code http://whatis.techtarget.com/definition/QR-code-quick-responce-code http://www.qrstuff.com 16
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