What is the difference between one-dimensional code and two-dimensional code?

Difference: 1. One-dimensional code can generally only hold 30 characters, while the maximum data of QR code can reach 1850 characters. 2. One-dimensional codes can only express information in the horizontal direction and need to be connected to another database; while QR codes can express information in both horizontal and vertical directions and do not need to be connected to another database. 3. One-dimensional codes do not have a strong error correction function, but two-dimensional codes do. 4. The coding systems of one-dimensional and two-dimensional codes are different. 5. One-dimensional codes can be used in commerce, postal services, library management, warehousing, industrial production process control, transportation and other fields; two-dimensional codes are mostly used in information acquisition, website jumps, mobile payments, account logins, etc.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Barcodes are multiple black bars and blanks of varying widths arranged according to certain coding rules to express different information. Currently, there are two types of barcodes: one-dimensional codes and two-dimensional codes.

One-dimensional codes can improve the speed of information entry, but they can only express information horizontally and have small data capacity. Except for some code systems that can contain some visible characters, most code systems can only contain numbers and letters. Barcode size Relatively large (low space utilization) and cannot be identified once damaged.

QR code can express information in both horizontal and vertical directions. It has a large data capacity. The information content can include Chinese characters, characters, letters, numbers, etc. The content can be read directly with a scanning device without the need to connect to another database. , the barcode is relatively small in size (high space utilization) and has the ability to resist damage.

The difference between one-dimensional code and two-dimensional code

1. Different information capacity

The content of one-dimensional code can only be letters and numbers , the large size and low space utilization determine the low information capacity, which generally can only accommodate 30 characters, while the QR code has a large information capacity, with the maximum data capacity up to 1850 characters.

2. Different ways of expressing information

One-dimensional code can only express information in the horizontal direction. Its height is usually to facilitate the reading of barcode equipment, and one-dimensional code cannot directly express product information. , need to connect to another database. QR codes can express information in both horizontal and vertical directions, and can directly store product information without connecting to another database.

3. Different error correction capabilities

One-dimensional codes do not have strong error correction capabilities. If the barcode is damaged, it will not be recognized. The error correction rate of QR code is divided into four levels: L, M, Q, and H from low to high. The maximum error correction rate of each level is 7%, 15%, 25%, and 30% respectively. QR code error correction The rate level can be manually selected in the barcoding software.

4. The two code systems are different

One-dimensional code and two-dimensional code have their own barcode code systems and components. Commonly used one-dimensional codes: 128 code, EAN code, Cross 25 code, UPC code, ISBN code, Codabar (Cudabar code), etc. Commonly used QR codes: QR Code, data Matrix, PDF 417.

5. The scope of application is different

One-dimensional codes are widely used in commerce, postal services, library management, warehousing, industrial production process control, transportation and other fields. QR codes are mostly used in: information acquisition, website jumps, advertising push, mobile e-commerce shopping, anti-counterfeiting traceability, preferential promotions, membership management, mobile payment, account login, etc.

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