Why are there three boxes at the corners of a QR code? Nine out of ten people probably don't know the answer..

Whenever you pay for tea at a shop, book a metro ticket, or visit a website, you likely scan a QR code. While we all use this technology in our daily lives, very few people pay attention to its intricate design. If you look closely, almost every QR code features square boxes in three of its corners, while the fourth corner remains empty. Many assume this is merely a design choice or pattern, but in reality, a highly intelligent technology operates behind it, enabling payments to be completed in the blink of an eye.

In technical terms, these three large squares are known as "finder patterns" or "position detection patterns." You can think of them as the eyes of the QR code. When you point your mobile camera at a QR code, these three boxes are the first to signal to the camera's software that a code is present. This allows the camera to ignore the background and focus directly on the data.

**Scan in seconds, whether the phone is upside down or tilted**

You do not need to hold your phone perfectly upright when scanning; you can hold it upside down, tilted, or at any angle. These three boxes help the scanner determine the code's orientation. Upon detecting these boxes, the scanner internally aligns the image to recognize it. This is why the scanning process takes just 0.1 seconds.

**Why is the fourth corner left empty?**
If large boxes were placed in all four corners, your phone would be unable to distinguish the top of the code from the bottom. Mathematically, only three points are required to determine the orientation of a square object. The absence of a box in the fourth corner allows the scanner to understand whether the code is positioned upright or upside down.

**A quick, interesting fact**
The QR code was invented in 1994 by the Japanese company Denso Wave. Initially, it was used to count and identify car parts, but today it has become a crucial part of our digital lives.

Disclaimer: This content has been sourced and edited from News18 Hindi. While we have made modifications for clarity and presentation, the original content belongs to its respective authors and website. We do not claim ownership of the content.