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2D Code, also known as two-dimensional barcode, is a new way of encoding and storing data information developed on the basis of one-dimensional barcode. QR codes can represent various information such as Chinese characters, pictures, fingerprints and sounds. Due to its strong machine readability, easy scanning and use, and relatively more information storage, QR codes are widely used in logistics warehousing, retail, service industry, drug supervision, biological reagent information storage, ID verification, product labeling, smart transportation , is widely used in the field of security.

Two-dimensional codes can be mainly divided into stacked type and matrix type according to different coding principles. Common two-dimensional codes mainly include QR code, PDF417, DM code, etc. Different two-dimensional codes are applied in different scenarios according to their different characteristics.

QR code
QR code is a matrix two-dimensional code with ultra-high-speed, all-round reading characteristics, and is currently the most widely used. It is usually used for logistics and industrial automation production management. In daily life, QR codes are also used for bus and subway ride codes and WeChat QR code business cards.

 

 

PDF417
PDF417 is a stacked QR code, which is a portable data file with high density and high information content, and the stored information cannot be rewritten. Due to the large information content and strong confidentiality and anti-counterfeiting properties of this two-dimensional code, it is mostly used in boarding passes, passports and other documents.

 

 

DM code
DM code is a matrix two-dimensional code, which only uses the perimeter for identification and has high security, so it is often used in the field of national defense and security, aerospace parts marking, etc.

 

As QR code applications become more and more popular, printers and QR code scanners for printing QR codes have also become indispensable.