Question 1

Why was the QR code invented, and how does it differ from a standard barcode?

Accepted Answer

The QR code was developed in 1994 by Masahiro Hara at DENSO WAVE to solve efficiency problems in Japanese car factories. Traditional 1D barcodes could only store about 20 characters, forcing workers to scan up to ten different codes on a single car part to track all necessary data. By using a 2D matrix that reads both vertically and horizontally, the QR code can store up to 7,000 characters, making it over 300 times more powerful than its predecessor.

Question 2

How does a scanner recognize a QR code if it is tilted or damaged?

Accepted Answer

QR codes feature three large squares in the corners known as "finder patterns" which use a specific black-and-white ratio of 1:1:3:1:1. This unique signature allows scanners to identify the code's orientation from any 360-degree angle instantly. Additionally, the codes utilize Reed-Solomon error correction—the same math used by NASA—which allows a code to remain functional even if up to 30% of it is damaged, dirty, or obscured by a logo.

Question 3

Why did it take so long for QR codes to become popular in the West?

Accepted Answer

While QR codes were widely adopted in Japan by 2002, they faced "friction" in Western markets for years because users had to download third-party apps to scan them. This changed significantly in 2017 when Apple integrated a native QR scanner into the iOS camera app, followed quickly by Android. The technology then saw a massive "Contactless Renaissance" during the 2020 pandemic when businesses needed safe, touch-free ways to provide menus and information.

Question 4

What are "Dynamic" QR codes and how are they used today?

Accepted Answer

Dynamic QR codes allow the destination of the code to be changed without reprinting the physical square. While the pixel pattern remains the same, the link it directs to can be updated in the background, which is highly sustainable for businesses like restaurants that change their menus frequently. Modern versions are also being used for "GS1 Digital Link" initiatives, which aim to replace grocery store barcodes with 2D codes to provide consumers with detailed information on food safety and origins.

Question 5

What safety precautions should users take when scanning QR codes?

Accepted Answer

Users should be aware of "Quishing" or QR phishing, where scammers place fake stickers over legitimate QR codes to redirect users to malicious websites. Because humans cannot read the data inside the square, it is important to check the URL preview on your smartphone screen before clicking through. Additionally, users can physically check if a QR code is a sticker placed on top of another surface, which can be a red flag for tampering.

QR code history is older than you think

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