What is a 2D barcode/QR code?
Two-dimensional bar code is a kind of black and white figure distributed on a plane (two-dimensional direction) according to certain rules, which is used to record data symbol information. In coding, the concepts of "0" and "1" bit streams, which constitute the internal logic foundation of the computer, are skillfully used, and several geometric figures corresponding to binary are used to represent the numerical information of characters, which can be automatically read by image input equipment or photoelectric scanning equipment to realize the automatic processing of information: it has some characteristics of barcode technology: each code system has its own specific character set; Each character occupies a certain width; It has certain verification function. At the same time, it also has the characteristics of automatically identifying different lines of information and dealing with the rotation and change of graphics.
Two-dimensional code/two-dimensional code can express information in both horizontal and vertical directions at the same time, so it can express a lot of information in a small area.
Classification of 2D Barcode/QR Code
2D barcode/QR code can be divided into stacked 2D barcode and matrix 2D barcode. The stacked/row-arranged two-dimensional bar code is formed by stacking a plurality of rows of chopped one-dimensional bar codes; Matrix two-dimensional bar code consists of a matrix, where binary "1" is represented by dots, binary "0" is represented by spaces, and the coding consists of dots and spaces.
1. Stacked/progressive 2D barcode
Stacked/line 2D barcode (also called stacked 2D barcode or layered 2D barcode), its coding principle is based on one-dimensional barcode and stacked into two or more lines as required. It inherits some characteristics of one-dimensional bar code in coding design, checking principle and reading mode, and the reading equipment is compatible with bar code printing and one-dimensional bar code technology. However, due to the increase of the number of lines, it is necessary to judge the number of lines, and its decoding algorithm and software are not exactly the same as those of one-dimensional bar code. Representative two-dimensional bar codes are: Code 16K, Code 49, PDF4 17, etc.
2. Matrix QR code
Short array two-dimensional bar code (also called chessboard two-dimensional bar code) is coded in rectangular space by the different distribution of black and white pixels in the matrix. In the position of the corresponding element in the matrix, the binary "1" is represented by the appearance of points (squares, points or other shapes), and the binary "0" is represented by the absence of points. The arrangement and combination of points determine the meaning represented by matrix two-dimensional bar code. Matrix two-dimensional bar code is a new coding system based on computer image processing technology and combined coding principle, which can automatically read and process graphic symbols. Representative matrix two-dimensional codes include: code one, Maxi code, two-dimensional code, data matrix and so on.
At present, among dozens of QR codes, the commonly used code systems are: PDF4 17 QR code, Datamatrix QR code, Maxicode QR code, Code 49, Code 16K, Code One and so on. In addition to these common two-dimensional barcodes, there are Vericode barcode, CP barcode, Codablock F barcode, Tian Zi barcode and Ultracode.
Characteristics of 2D Barcode/QR Code
1. high-density coding, large information capacity: it can accommodate up to 1850 capital letters or 27 10 numbers or10/08 bytes, or more than 500 Chinese characters, which is several times higher than ordinary bar codes.
2. Wide coding range: Barcodes can encode digitized information, such as pictures, sounds, characters, signatures, fingerprints, etc. , and represented by bar code; Can represent multiple languages; Can represent image data.
3. Strong fault tolerance and error correction function: This enables the QR code to be read correctly when it is partially damaged due to perforation, fouling, etc. When the damaged area reaches 50%, the information can still be recovered.
4. High decoding reliability: far lower than the decoding error rate of two millionths of ordinary bar codes, and the error rate does not exceed one millionth.
5. Encryption measures can be introduced: good confidentiality and strong anti-counterfeiting.
6. Low cost, easy to manufacture and durable.
7. The shape, size and proportion of bar code symbols are variable.
8. Two-dimensional barcode can be read by laser or CCD reader.
Current application of two-dimensional bar code;
Two-dimensional bar code has the characteristics of large storage capacity, high confidentiality, high traceability, strong anti-loss ability, high redundancy and low cost. These features are especially suitable for forms, security, tracking, licensing, inventory checking, data backup and so on.
Form application:
The transmission and exchange of official document forms, business forms, import and export declarations, manifests and other data can reduce repeated manual input of form data, avoid human errors and reduce labor costs.
Security application:
Encryption and transmission of confidential information such as business information, economic information, political information, military information and private information.
Tracking application:
Automatic tracking of official documents, automatic tracking of production line parts, automatic tracking of customer service, automatic tracking of mail order delivery, automatic tracking of maintenance records, automatic tracking of dangerous goods, automatic tracking of logistics supply, automatic tracking of physical examination, automatic tracking of ecological research (animals, birds ...), and so on.
Permit application:
Registration and automatic input of passport, ID card, registration card, driver's license, membership card, ID card, chain store membership card, etc. , so as to play the information management effect of "reading on demand" and "instant access".
Inventory application:
Automatic inventory of goods and fixed assets in logistics centers, storage centers and joint logistics centers can play the role of "immediate inventory and immediate decision-making".
Redundant application:
If the data of documents and tables are unwilling or unable to be stored in electronic media such as disks and optical disks, two-dimensional bar codes can be used to store and back up, which is convenient to carry, not afraid of folding, and can be stored for a long time, and more backups can be made by copying and faxing.
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Pet shop boy's latest single "inseparable integral" is synchronized with QR code barcode technology.
Pet shop boys pet shop boys, the first pioneer of British pop music duo, has been leading the global fashion and topic trend. In the music video of the latest single "Always Together", the bar code technology of QR (Quick Response) code of mobile phone is combined for the first time, hoping to directly introduce fans into the network discussion boundary advocating human rights and freedom.
Since 1986, pet shop boys has published a series of remix albums with the theme of "Disco". However, in the past, it used to include remixes of pet shop boys's hit singles made by other DJs or mixers, but this year Disco 4 subverted this principle for the first time. Different from the first three films, Disco 4 contains a special remix of pet shop boys's singles ranked by other singers, including Madonna, Yoko Ono Lennon Yoko Ono Lennon and David Bowie. Under the clever manipulation of the boys in the pet shop, a brand-new dance style was especially brought out. In addition, this album also includes two rare remixes of pet shop boys's own works. Among them, the highly anticipated pet shop boys's latest single "Integral" was first released in the new album.
Pet shop boys, which has always been leading the global fashion, issues and trends, specially shot the latest single "We Are Together" into color and black-and-white versions in order to advocate human rights, freedom and anti-high-pressure government monitoring, and simultaneously combined QR (Quick Response) code bar code technology. Fans can directly connect to exclusive websites and discussion forums by holding a camera phone that supports QR codes and taking pictures of the bar codes appearing in pet shop boys's new music "Music Video of Integral", so that they can not only get more news and latest news about pet shop boys's behind-the-scenes production, but also enter the discussion forums on anti-government high-pressure monitoring and human rights and freedom.
Britain will use mobile phone bar code as boarding certificate on 20 10.
According to British computing media reports, it is estimated that in 20 10, mobile phone bar codes will be used as boarding certificates in Britain. When passengers check in and board at the counter, British Airways and Virgin Atlantic will gradually implement mobile phone bar codes to replace traditional paper boarding passes. Mobile phone bar code boarding pass is regarded as a boarding pass with huge business opportunities. Eric Leopold, spokesman of International Air Transport Association (IATA), said that both printed bar codes and bar codes displayed on mobile phones will replace traditional air tickets, and mobile phone bar code certificates will be partially adopted before 2008, and will be completely replaced by 20 10. This technology will be implemented from some international airports, and passengers in Tokyo and Beijing will receive electronic boarding passes through their mobile phones.
Mobile phone QR code application:
Simply speaking, the technology of scanning two-dimensional code by mobile phone is to scan two-dimensional code through the camera function of mobile phone, quickly obtain the information stored in two-dimensional code, surf the Internet, send short messages, dial up, exchange data, and automatically input text. At present, the mobile phone QR code has been used and developed by major mobile phone manufacturers.
Mobile phone QR code is a kind of QR code, which can be printed on newspapers, magazines, advertisements, books, packaging and personal business cards. Users can also scan the QR code through the mobile phone, or input the numbers below the QR code, so as to realize fast Internet access on the mobile phone, download pictures and texts anytime and anywhere, and learn about enterprise product information.