QR code-quick matrix two-dimensional Barcode

QR code-quick matrix two-dimensional Barcode

 

The QR code is a matrix QR code symbol developed by the Japanese company Denso in September 1994, in addition to the large information capacity and high reliability of one-dimensional and other two-dimensional codes, QR codes can represent multiple types of text information in Chinese characters and images, and provide strong confidentiality and anti-counterfeiting capabilities, QR codes also have the following features:

A common one-dimensional bar code can only represent about 20 characters or numbers in a horizontal position. It has no error correction function. It must be supported by the background database, while a QR code
A two-dimensional Barcode contains information in the vertical direction and can be placed into a large amount of information, such as letters, numbers, Chinese characters, photos, fingerprints, and so on. It is quite a movable database. If one-dimensional and two-dimensional codes are used to represent the same information
The space occupied by the QR code is only 1/11 of the bar code area.

A QR code (2D) contains information both in the horizontal and vertical directions, while a QR code contains information in only one direction. QR codes can contain much more information than bar codes.

Compared with other QR codes, QR codes have the advantages of fast reading speed, high data density, and low space occupation. The three corners of the QR code have three image search images.
The CCD reader detects the location, size, tilt angle, and decoding of codes, and implements high-speed reading of 360 reads. You can read 30 QR codes containing 100 characters per second. High QR code capacity density, yes
Enter 1817 Chinese characters, 7089 numbers, and 4200 English letters. QR codes use data compression to represent Chinese characters. Only 13 BITs are used to represent one Chinese character.
The rate has increased by 20%. QR code has four levels of Error Correction functions, which can be correctly read even if damaged or damaged. The QR code has strong bending resistance. The QR code is configured with a correction image at a certain interval.
The shape of the QR code is used to determine the deviation between the center and the actual center to correct the center distance of each module. Even if the QR code is pasted on the curved item, the system can quickly read and understand the QR code. QR codes can be divided
16 QR codes can be read at one time to meet the printing requirements of limited area and slim space. In addition, the micro QR code can contain 35 numbers, 9 Chinese characters, or 21 characters in 1 cm space.
English letters, suitable for collecting ID numbers on small circuit boards.

Up to 7,089 numbers can be encoded (300 characters or numbers are compiled into a QR code of this size)

The same data is only one tenth of the bar code size.

Ultra High Speed reading:
Quick response code can be seen from the English name of the QR code.
Code is different from four to seven bar codes and Data
Matrix and other QR code features. Because the whole QR code is read by CCD
The information in the code symbol is read through the QR code
The location detection image of the code symbol is implemented by hardware. Therefore, the information reading process takes a short time, and it has the characteristics of ultra-high-speed reading. The CCD Two-dimensional Barcode reading device can read 30 devices per second.
QR code with 100 characters
Code Symbol. Only three characters can be read per second for four-seven-bar code symbols containing the same data information.
Martix matrix code, which can only read 2 ~ Three symbols. Qr
The ultra-high speed reading feature of code is that it can be widely used in industrial automation production line management and other fields.

Comprehensive reading:
The QR code has comprehensive (360 °) Reading features. This is a QR code
The code is better than the line-organized two-dimensional code, such as the four-seven-bar code, another major feature, because the four-seven-bar code is to truncate the one-dimensional bar code symbol on the row height, therefore, it is difficult to implement comprehensive reading.
The read azimuth is only ± 10 °.

It can effectively represent Chinese and Japanese characters:
Because
The Code uses a specific data compression mode to represent Chinese and Japanese characters. It only uses 13 BITs to represent a Chinese character, while the Code contains four to seven codes, Data
The two-dimensional codes such as martix do not have a specific Chinese character representation mode. Therefore, only the byte representation mode is used to represent Chinese characters. When the byte mode is used to represent Chinese characters, 16bit (two bytes) is used to represent one Chinese character. Therefore
Qr
The code is 20% more efficient than other two-dimensional codes for Chinese characters.

Encoding character set:
1. Digital Data (numbers 0 ~ 9 );
2. alphanumeric data (numbers 0 ~ 9; uppercase letters ~ Z; 9 other characters: space, $, %, *, + ,-,.,/,:);
3. 8-Bit Data;
4. Japanese characters;
5. Chinese characters (Chinese characters and non-Chinese characters corresponding to GB 2312 ).

Basic Features of QR codes

Symbol specification 21 × 21 module (version 1)-177 × 177 module (version 40) (each Specification: four modules are added at each side)

Data type and capacity (up to 40-l characters)
· Digital data: 7,089 characters
· Letters: 4,296 characters
· 8-bit data: 2,953 characters
· Chinese characters and Japanese characters: 1,817 characters

The data representation method is the dark color module that represents the binary "1", and the light color module that represents the binary "0 ".

Error correction capability
· L-level: about 7% of data code words can be corrected.
· M-level: 15% of data code words can be corrected
· Q level: About 25% of data code words can be corrected
· Level H: about 30% of data code words can be corrected

Structural link (optional) 1-16 QR code symbols can be used to represent a group of information

The mask (inherent) can make the ratio of the deep color in the symbol to the light color module close to, so that the possibility of decoding difficulties caused by the arrangement of adjacent modules is minimized.

Extended interpretation (optional) This method enables a symbol to represent data other than the default character set (such as Arabic, guislavic, and Greek letters ), and other interpretations (such as data expressed in a certain compression method) or encoding of industry characteristics.
Independent Positioning

The QR Code can efficiently represent Chinese characters with the same content. Its size is smaller than of the same density. Currently, most bar code printers on the market support QR code codes, and their proprietary Chinese character model is more suitable for Chinese applications. Therefore, QR codes have good application prospects in China.