Literacy: What is a "two
What is Two-dimensional bar code / Two-dimensional code
Two-dimensional bar code / two-dimensional code (2-dimensional bar code) is a specific geometry according to certain rules in the plane (two-dimensional direction) distribution of black and white graphic record of the data symbols of information; in the code the preparation of the clever use of the computer form the basis of the internal logic "0", "1" bit stream of the concept, using a number corresponding with the binary geometry values expressed in text messages, through the image input device or the optical scanning device automatically know time to achieve the automatic processing of information: it has a bar code number in common: each code system has its specific character set; a certain share of the width of each character; has some validation functions. It also has information on the different lines automatic identification function, and processing characteristics of graphics rotation changes.
Two-dimensional bar code / two-dimensional code Two-dimensional bar code / two-dimensional code can be both horizontal and vertical directions while the expression of information, so can be expressed in a small area of a lot of information.
Two-dimensional bar code / two-dimensional classification codes
Two-dimensional bar code / two-dimensional code can be divided into stack / row in row two-dimensional bar code and Matrix Type two-dimensional bar code. Stacked / line in row two-dimensional bar code form on-line stub from the multi-stacked one-dimensional bar code; Matrix two-dimensional bar code in the form of a matrix composed of the corresponding element in the matrix position of "point" for binary "1 "with" empty "for binary" 0 ", the" point "and" empty "and composed the code.
Two-dimensional bar code / two-dimensional code 1. Stack / row in row two-dimensional bar code
Stack / row in row two-dimensional bar code (also known as two-dimensional bar code or a stacked-type layer in row two-dimensional bar code), the coding theory is built on the basis of one-dimensional bar codes, stacked into two rows as necessary or line. It is in the code design and verification principles, such as literacy approach inherited some characteristics of one-dimensional bar code, bar code reader device and Print Compatible with the one-dimensional bar code technology. However, the increase in the number of rows need to be determined on the line, the decoding algorithm and software are not exactly the same as in the one-dimensional bar code. Representative two-dimensional bar code line in row there: Code16K, Code 49, PDF417, etc..
2. Matrix two-dimensional code Two-dimensional bar code
short formation (also known as two-dimensional bar code chessboard) it is in a rectangular space by black and white pixels in the matrix encoded with different distribution. Corresponding element in the matrix position, with points (square points, dots or other shapes), said the emergence of a binary "1", point does not appear that the binary "0", points permutations identified by the matrix two-dimensional bar code represents. Matrix two-dimensional bar code is based on computer Image Processing Technology, combined coding based on the principle of such a new graphic symbol code system for automatic processing literacy. Representative two-dimensional matrix bar code are: CodeOne, Maxi Code, QR Code, Data Matrix and so on.
To present dozens of two-dimensional code, common code system are: PDF417 two-dimensional bar code, Datamatrix two-dimensional bar code, Maxicode two-dimensional bar code, QR Code, Code 49, Code 16K, Codeone, etc., in addition to these Common two-dimensional bar code, there Vericode barcode, CP bar, CodablockF bar code, field code, Ultracode bar code, Aztec bar code.
Two-dimensional bar code / two-dimensional characteristic code
1. High-density encoding, information-capacity: can accommodate up to 1850 capital letters or 2710 number or 1108 bytes, or 500 Chinese characters, bar code information capacity than the average of about a few times.
2. Encoding a wide range: the bar code can be pictures, sounds, text, signatures, fingerprints and other digital information can be encoded with a bar that came out; can be expressed several languages; can be expressed as image data.
3. Fault-tolerant ability, with error correction function: this makes two-dimensional bar code because of perforation, defacement, etc., causing local damage, can still be correctly read, can damage an area of up to 50% recovery information.
4. Decoding reliability: Compared with conventional bar code decoding error rate two millionths much lower bit error rate of less than 1/10000000.
5. For the introduction of encryption: confidentiality, Security Good.
6. Low cost and easy Make Durable.
7. Bar code symbol shape, size, proportion of variable size.
8. Two-dimensional bar code can use the laser or C CD Reader literacy. Two-dimensional bar codes currently used
Dimensional bar code with large storage capacity, high secrecy, tracking high, and strong resistance to damage, redundancy of the great, low cost and other features, these features particularly suitable form, Security Confidentiality, tracking, certificates, stock inventory, data backup and so on.
Application form Document form, Business Form, import and export declarations, manifests and other data transmission exchange, reduce duplicate manual data input form to avoid human errors, reduce labor costs.
Confidential application Business intelligence, economic intelligence, political intelligence, military intelligence, intelligence and other confidential information private encryption and transmission.
Tracking applications Automatic document tracking, auto parts production line tracking, customer Service Automatic tracking, mail-order delivery of automatic tracking, maintenance record automatic tracking, automatic tracking of dangerous goods, logistics automatic tracking, automatic tracking of medical examination and ecological research (animals, birds …) automatic tracking.
License applications Passport, identity card, registration card, driver's license, membership cards, identification cards, membership cards store information such as license registration and automatic input, play a "pick-reading", "immediate access" to information management effectiveness.
Inventory application Logistics center Storage Center, joint logistics center for goods and fixed assets inventory automatically, to play "immediately inventory, immediate decision-making" effect.
Backup applications File the form information if unwilling or unable to drive, CD-ROMs Electronic Backup storage media, the two-dimensional bar code can be used to store backup, easy to carry, not afraid to fold, save a long time, but also photocopiers fax, to do more backup.
Phone Application of two-dimensional code Two-dimensional code mobile scanning technology
simple cell phone camera that function through the code on two-dimensional scanning and rapid access to information stored in two-dimensional bar code, to the Internet, send text messages, dial-up, information exchange, auto-text input, etc. , mobile phone two-dimensional code has been the major mobile phone manufacturers now use development.
Two-dimensional code is a two-dimensional code phone a,
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