QR code: Secret hidden in double rectangle-2000 ISO standard certification
Familiar QR code in everyday life.
The engineer was an engineer working for a Japanese auto parts maker.
The development was DENSO’s Masahiro Hara (61).
Completed in 1994 after a two-year development .
QR code: double rectangle
As fast as the QR code = quick response name, you can read at high speed
A code that can contain up to 7,000 characters of information.
You can also express kanji.
Patent release: no license fee
Recognized as an international standard of ISO in 2000, it is used worldwide.
In Japan, a mobile phone with a QR code reading function was released, and the recognition level increased rapidly.
Although this company has a patent for QR code, it does not have a license fee for publishing the patent.
Q What did you devise during development?
The most difficult part was “extracting and reading only the code when buried in characters”.
I thought it would be good to mark something, and came to the double rectangle placed at the three corners.
It is called “cutout symbol”.
Q Does this double rectangle hide a secret that can not be buried in characters?
A distinctive shape was needed to distinguish it from the letters.
In order to find it, I checked the ratio of the area of characters around the world (Japanese, Korean, alphabet, Chinese, Thai, Arabic, etc.) and searched for the ratio not used as characters.
What I found over the course of three to four months is the ratio of black and white to the present.
Assuming that the ratio of the width of the outermost black is 1,
The next white is also a ratio of 1,
The next black is a ratio of 3.
The overall ratio is 1: 1: 3: 1: 1.
If I can not find this own ratio, it may be that “the QR code was not born”.
In addition, this square is placed at three corners.
By arranging at the three corners, you can find the outline of the QR code.
If one corner is open, you can distinguish the top, bottom, left, and right of the QR code.