What is QR code

Dimension code (dimensional barcode), also known as 2D barcode, is a readable barcode that is extended on the basis of one-dimensional barcodes. The device scans the 2D barcode and can obtain the information contained therein by identifying the binary data recorded in the length and width of the barcode. Compared to one-dimensional barcodes, two-dimensional codes record more complex data, such as pictures, web links, and so on.

A detailed description of a two-dimensional bar code/dimensional code (dimensional barcode) is to record data symbol information in a black and white pattern distributed in a plane (in a two-dimensional direction) using a certain geometric pattern; Using the concept of "0" and "1" bit streams that form the internal logic of the computer, a number of binary geometric entities are used to represent literal numerical information, which is automatically read by an image input device or photoelectric scanning device to realize information. Automatic processing: It has some common features of barcode technology: each code has its own specific character set; each character occupies a certain width; has a certain verification function. At the same time, it also has the features of automatic identification of different lines of information, and the ability to handle graphic rotation changes. In many kinds of 2D barcodes, commonly used code systems include: Data Matrix, Maxi Code, Aztec, QR Code, Vericode, PDF417, Ultracode, Code 49, Code 16K, etc. The QR code was created by Denso-Wave Corporation of Japan in 1994. invention. QR comes from the abbreviation of “Quick Response” in English, which means quick response. It originates from the inventor's hope that the QR code can quickly decode the content. QR codes are most common in Japan and Korea; they are currently the most popular two-dimensional space bar codes in Japan.

The difference between two-dimensional code and one-dimensional code Multi-line bar code, do not need to connect to a database, can store large amounts of data itself, used in: hospitals, driver's license, material management, cargo transportation, when the bar code is subject to certain damage, error correction Enables barcodes to decode two-dimensional codes correctly. It is a multi-line, continuous, variable-length, symbolic identifier that contains a large amount of data. Each bar code has 3 to 90 lines, and each line has a start portion, a data portion, and an end portion. Its character set includes all 128 characters and the maximum data content is 1850 characters.

A one-dimensional bar code only expresses information in one direction (usually the horizontal direction), but does not express any information in the vertical direction, and its certain height is usually for the purpose of facilitating the alignment of the reader.

The application of one-dimensional barcodes can increase the speed of information entry and reduce the error rate, but there are also some deficiencies in one-dimensional barcodes:

Smaller data capacity: about 30 characters.

Can only contain letters and numbers.

The bar code size is relatively large (space utilization is low).

The bar code cannot be read after it has been damaged.

Barcodes that store information in two dimensions, horizontally and vertically, are called a three-dimensional bar code.

Mobile phone QR code application Mobile phone QR code is the application of two-dimensional code technology on mobile phones. A two-dimensional code is a new generation of bar code technology that records data symbol information in black and white rectangular square arrays distributed in a plane (in a two-dimensional direction) with certain geometrical patterns. The two-dimensional code consists of a two-dimensional matrix code and a two-dimensional code. No., as well as the following description of the text composition, with a large amount of information, error correction ability, reading speed, full reading and so on. The information that needs to be accessed and used by the mobile phone is encoded into a two-dimensional code and is read by the camera of the mobile phone. This is the mobile phone two-dimensional code. Mobile phone QR code can be printed on newspapers, magazines, advertisements, books, packaging, personal business cards, and other carriers. Users can quickly access the mobile phone through the mobile phone camera to scan the QR code or enter the number and keyword under the QR code. , Quickly and easily browse the web, download graphics, music, video, get coupons, participate in sweepstakes, learn about enterprise product information, eliminating the cumbersome process of entering URLs on mobile phones, to achieve one-click access to the Internet. At the same time, it is also convenient to use the mobile phone to identify and store business cards, automatically enter text messages, get public services (such as weather forecast), and achieve a variety of functions such as electronic map query positioning and mobile phone reading. With the advent of 3G, QR codes can provide convenient access for web browsing, downloading, online video, online shopping, and online payment.

The barcode recognition application provides great convenience for the user to access the Internet through the mobile phone, eliminating the trouble of inputting the URL, and quickly accessing the web page that he wants to see at one click, greatly improving the convenience of the Internet. In addition, barcode identification applications also provide a way for flat media, value-added service providers, and businesses to communicate with users anytime, anywhere.

The bar code identification internet application aims to further provide users with convenient and high-quality mobile internet services, and at the same time build a mobile phone two-dimensional code industrial chain with Chinese characteristics, opening up space for enterprises and industry applications. China Mobile is pushing mobile phone manufacturers to pre-load mobile phone barcode recognition software. Mobile phone two-dimensional code and mobile phone menus and search engines are also known as mobile Internet access. Our mission is to allow users to access any content from any location, through any media, and through this platform service, for media, companies, and brands. Create value.