QR Code Barcode (Quick Response Barcode)

Designed by Denso in Japan, QR (Quick Response) Code barcode is a 2 dimensional general-purpose matrix designed for fast scanning of information. As QR efficiently encodes Kanji characters, it is a popular symbology in Japan. QR Code Barcode symbols are square in shape and can easily be identified by their finder pattern of nested alternating dark and light squares at three corners of the symbol.

QR Code is capable of 360 degree (omni-directional), high speed reading. QR Code accomplishes this task through position detection patterns located at the three corners of the symbol. These position detection patterns guarantee stable high-speed reading, circumventing the negative effects of background interference.

QR Code Specification

Symbol size	21 × 21 - 177 × 177 modules (size grows by 4 modules/side)
Type & Amount of Data (Mixed use is possible.)	Numeric	Max. 7,089 characters
	Alphanumeric	Max. 4,296 characters
	8-bit bytes (binary)	Max. 2,953 characters
	Kanji	Max. 1,817 characters
Error correction (data restoration)	Level L	Approx. 7% of codewords can be restored.
	Level M	Approx. 15% of codewords can be restored.
	Level Q	Approx. 25% of codewords can be restored.
	Level H	Approx. 30% of codewords can be restored.

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