Nundnet : Turnstiles & Access Controls

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  • QR Code or Quick Response Code

QR Code or Quick Response Code

by Nundnet / Wednesday, 23 February 2022 / Published in Access Controls, Nundnet News Desk, Technology, Turnstiles
QR Code Reader

QR code is an acronym for Quick Response code and is a two dimensional barcode. It stores information as the pixels, and it store huge data. Independent of the data size, the code is scanned at very fast speed hence referred as Quick Response  

It was invented by the Toyota Japans Subsidiary Denso in 1994 to accurately track the vehicles and spare parts; this type of barcode accurately encodes kanji, kana, and alphanumeric characters.  Kana print alphabet of Japanese and are the cursive from, and the entire words are represented by Kanji. Kanji may be standalone and can be connected with other Kanji or Kana to form words of different types.

These codes can be read in all directions while as barcodes read only in one direction hence becomes acceptable for most of the applications. QR codes store huge amount of data from texts to websites to emails.

The six components for Quick Response codes as mentioned below

ZONESPATTERNSVERSIONDATA
QuietFinderInformationCells
 Alignment  
 Time  
    
Code area boundaryDetails of code areaType of QR CodeText, URL & other information
TABLE 1 : COMPONENTS OF QR CODE

Quiet zone is empty white border that determines details contained in the code. It is essentially a container for the Quick Response Code hence protects the code from external interference. Bottom left, top left & top right corners on the Quick Response code contain three black squares that insure the Quick Response code reader about the boundaries of code hence called as finder pattern.  L shaped line that runs between three squares of finder pattern is referred as the timing pattern helps in reading codes despite if damaged. The small field near the top of pattern cell used to identify the version of Quick Response Code.  Data cells contain all the information stored in the QR code from texts to websites or other information.

The different types of Quick Response Codes are described as below

MODES 
NUMERICContains numerals from 0 ~9, effective mass storage of 7089 characters
ALPHA NUMERICContains numerals, alphabets, special characters, space with mass storage of 4296 characters.
BYTEISO 8859-1 encodes what it refers to as “Latin alphabet no. 1”, consisting of 191 characters from the Latin script. And allows storage of 2953
KANJIIt is symbolic, or logographic. Supports storage of 1817
STRUCTUREDEncodes across multiple codes, can read unto 16 codes simultaneously
FNC1Functions as GS1 bar code which is neutral, not-for-profit, international organization developing and maintaining standards including barcodes. 
TABLE 2 : TYPES OF QR CODE

QR Code readers are widely used in security & trade applications due to easy to use and almost very low cost of generation & detection. Now  a days, Quick Response code scanners are integrated with access control devices and utilised at time attendance, access control and for visitor management.

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