What is a two-dimensional Barcode/QR code:
Two-dimensional Barcode/two-dimensional code (2-dimen1_bar code) records the data symbol information by using a certain geometric chart that is distributed on a plane (two-dimensional direction) in a regular manner; inCodeThe concept of "0" and "1" bit streams that constitute the computer's internal logic is skillfully used in the compilation, and several geometric shapes corresponding to the binary form are used to represent the numerical value information of the text, automatic reading through image input devices or photoelectric scanning devices to achieve automatic information processing: it has some commonalities of bar code technology: each code system has its specific character set; each character occupies a certain width; it has certain verification functions. At the same time, it also has the ability to automatically identify different rows of information, and to handle graphics rotation changes and other features.
The two-dimensional Barcode/QR code can express information both horizontally and vertically, so it can express a large amount of information in a small area.
Classification of two-dimensional Barcode/QR code
Two-dimensional Barcode/two-dimensional Barcode can be divided into stacked/row-layout two-dimensional barcode and matrix two-dimensional barcode. Stacked/row-lined two-dimensional bar codes are stacked by one-dimensional bar codes with multiple lines of short cut; matrix two-dimensional bar codes are composed of matrices, in the corresponding element position of the matrix, "point" indicates the binary "1", and "null" indicates the binary "0". The Code consists of the Arrangement of "points" and "null.1. Stacked/row-arranged two-dimensional Barcode
Stacked/row-based two-dimensional Barcode (also known as stacked two-dimensional barcode or layer-based two-dimensional Barcode), its encoding principle is based on one-dimensional barcode, stacked into two or more lines as needed. It inherits some features of one-dimensional Barcode in terms of coding design, Verification Principle, and recognition and reading method. The recognition and reading equipment is compatible with the one-dimensional Barcode technology. However, as the number of rows increases, you need to determine the rows and decode them.AlgorithmAnd the software is not exactly the same as the one-dimensional bar code. Typical two-dimensional bar codes include code 16 K, Code 49, and code 417.
2. Matrix QR code
A two-dimensional bar code (also known as a two-dimensional bar code for chess and board games) is coded in a rectangle space through different distributions of black and white pixels in The Matrix. In the position of the corresponding elements in the matrix, the appearance of a vertex (square point, Dot, or other shapes) indicates the binary "1", and the occurrence of a vertex does not represent the binary "0 ", the arrangement and combination of points determine the meaning of the two-dimensional bar code of the matrix type. Matrix two-dimensional bar code is a new type of automatic reading and processing code system based on computer image processing technology and the principle of combined encoding. Representative matrix two-dimensional bar codes include code one, Maxi code, QR code, and data matrix.
Currently, dozens of two-dimensional code types are commonly used:2017417 2D barcode,Datamatrix two-dimensional Barcode,Maxicode two-dimensional code,QR code, Code 49, code 16 K, code one, etc. In addition to these common two-dimensional codes, there are also QR codes, CP codes, codablock F codes, field codes, and ultracode codes, aztec barcode.
Features of two-dimensional Barcode/QR code
1. high-density encoding, large information capacity: it can contain up to 1850 uppercase letters, 2710 digits, 1108 bytes, or more than 500 Chinese characters, which is about dozens of times higher than the normal bar code information capacity.
2. wide encoding range: This bar code can encode pictures, sounds, text, signatures, fingerprints, and other information that can be digitalized and expressed with a bar code. It can represent texts in multiple languages; can represent image data.
3. Strong Fault Tolerance Ability and error correction function: This enables the two-dimensional bar code to be correctly read when it is damaged due to perforation or fouling. the damaged area reaches 50% square meters and information can still be restored.
4. High decoding Reliability: It is much lower than the error rate of normal bar code decoding, and the error rate cannot exceed one thousandth.
5. encryption measures can be introduced: Good confidentiality and anti-counterfeiting.
6. low cost, easy to make, and durable.
7. Variable bar code symbol shape and size ratio.
8. 2D barcode can be read by laser or CCD reader.
Current Application of Two-dimensional Barcode:
The two-dimensional Barcode features a large storage capacity, high confidentiality, high traceability, high loss resistance, high backup support, and low cost, these features are particularly applicable to forms, security and confidentiality, tracking, licenses, inventory check, and data backup.
Form application:
Transfer and exchange of documents, business forms, import and export reports, and hatch orders to reduce manual duplication of input form materials, avoid human errors, and reduce labor costs
Confidential applications:
Encryption and transmission of commercial, economic, political, military, and private information.
Tracing application:
Automatic Document tracking, 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 post-logistics supplies, automatic tracking of medical examination, ecological Research (animals, birds ...) automatic Tracing.
License application:
Registration and Automatic Input of passport, identity card, registered license, driver's license, membership card, identification card, and chain store membership card information to achieve "on-demand reading" and "On-Demand Access" information management.
Check application:
Automatic inventory check of goods and fixed assets in the logistics center, warehouse center, and joint logistics center to achieve the "check now and make immediate decisions" effect.
Backup application:
If you do not want or cannot store the file form data in electronic media such as disks and CDs, you can use two-dimensional code codes to store the backup data. It is easy to carry and is not afraid of folding. It takes a long time to store the data, you can also copy and print faxes to make more backups.
Mobile phone QR code application:
The mobile phone QR code scanning technology simply uses the mobile phone camera function to scan the QR code and quickly obtain the information stored in the two-dimensional barcode, mobile phone QR codes have been developed by major mobile phone manufacturers for accessing the Internet, sending text messages, dialing, data exchange, and automatic text input.
The QR code is a type of QR code. The QR code can be printed on newspapers, magazines, advertisements, books, packages, and personal business cards. You can also scan the QR code on your mobile phone, you can also enter the numbers below the QR code to enable the quick mobile Internet access function, and download text and documents anytime, anywhere to learn about enterprise product information.
