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The QR Code (Quick Response Code) is a matrix type two-dimensional code that was first designed in 1994 for the Japanese automobile industry.
QR code is a registered trademark of Denso Wave Incorporated.
The QR code has a function to repair the data by itself when the code is dirty or damaged. There are four levels of this function, and the higher the level, the more data will be required and the more complicated the code will be.
Please select an appropriate level depending on the environment where the QR code is used (e.g. choose ‘High’ for outdoor usage). Medium (15%) seems to be used in many cases.