- QR codes can use one of four possible error correction values. They are referred to by the letters: L, M, Q, and H. The L error correction level corresponds to 7% of the code can be corrected. The M error correction level corresponds to 15% of the code can be corrected. The Q error correction level corresponds to 25% of the code can be corrected. The H error correction level corresponds to 30% of the code can be corrected.
- The encoding used to represent the data in a QR code. There are four possible encodings: binary, numeric, alphanumeric, kanji.
- A square dot on a QR code. Generally, only the “black” dots count. The “white” squares are considered part of the background.
- quiet zone
- An empty area around the QR code. The area is the background module in color. According to the standard this area should be four modules wide.
- QR code
Quick Response code
- A two dimensional barcode developed by Denso Wave.
- A version is one of 40 different possible sizes a QR code comes in. The version of a QR Code determines it maximum possible data capacity.