{"id":3681,"date":"2022-01-12T05:40:00","date_gmt":"2022-01-11T19:40:00","guid":{"rendered":"https:\/\/2dpoint.net\/?p=3681"},"modified":"2022-01-12T06:08:31","modified_gmt":"2022-01-11T20:08:31","slug":"what-is-a-qr-code-and-why-does-it-have-3-squares-in-the-corners","status":"publish","type":"post","link":"https:\/\/2dpoint.net\/what-is-a-qr-code-and-why-does-it-have-3-squares-in-the-corners\/","title":{"rendered":"What is a QR code, and why does it have 3 squares in the corners?"},"content":{"rendered":"Reading Time: <\/span> 2<\/span> minutes<\/span><\/span>
    \n
  1. QR code stands for Quick Response code.<\/span><\/li>\n
  2. It was invented by a Japanese automotive company Denso Wave in 1994.<\/span><\/li>\n
  3. The idea behind a QR code is to create an image that the user can scan using a Smartphone camera to access a link to a website, video or any other media.<\/span><\/li>\n
  4. While the user can also type the website address to visit a site, the aim of the QR code is to simplify the process.<\/span><\/li>\n
  5. While it operates on the principles of a bar code, a QR code can store 350 times more data than a bar code.<\/span><\/li>\n
  6. The three B\/W squares (2 on top and one on bottom left) are known as the Finder Pattern.<\/span><\/li>\n
  7. They help the Smartphone camera recognise the QR code and inform it of the orientation of the code.<\/span><\/li>\n
  8. That means if the two squares are on top, the camera would know it is reading the QR code at the correct angle.<\/span><\/li>\n
  9. So, if a QR code is printed upside down, the \u201cSmart\u201d phone would know it has to adjust its scanner upside down to read the code.<\/span><\/li>\n
  10. That\u2019s why the QR code doesn\u2019t have four squares \u2014 if all 4 corners were the same, the scanner would not know if the code was the right way up, upside down, or rotated 90 degrees clockwise or anticlockwise.<\/span><\/li>\n
  11. Another thing that aids the correct reading of the code is the Alignment Pattern \u2014 it helps the scanner read the code even if it is a bit distorted or printed on a curved surface.<\/span><\/li>\n
  12. It is smaller than any of the Finding Pattern squares and has a small square (usually one dot) inside it.<\/span><\/li>\n
  13. If only one Alignment Pattern is present in a QR code, it is usually towards the bottom right corner.<\/span><\/li>\n
  14. The bigger the QR code, the more the number of Alignment Pattern squares.<\/span><\/li>\n
  15. A QR code is a matrix with an equal number of rows and columns, but it can\u2019t just have any number.<\/span><\/li>\n
  16. The number depends upon the Version Number of the QR code.<\/span><\/li>\n
  17. Versions range from 1 to 40; Version 1 has 21 rows and columns, Version 2 has 25, and Version 40 has 177 rows and 177 columns.
    \n<\/span><\/li>\n<\/ol>\n

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