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Technical advantages and development trend of two-dimensional bar code

Release Time:2013-06-12

According to the explanation provided by the national internet of things two-dimensional bar code public service platform, two-dimensional bar code is an information technology that uses a specific geometric shape to record data in a plane according to a certain law. compared with one-dimensional bar code, RFID (radio frequency) and other technologies, two-dimensional bar code can carry a large amount of information in a small area, with lower printing and reading costs, stronger security and higher identification efficiency, it has the magic of being able to "turn passive into active.

In fact, the two-dimensional bar code is extended to another dimension on the basis of the one-dimensional bar code, using rectangular patterns to represent binary data. Yang Jianzheng explained that the length and width of the two-dimensional bar code contain data, which can accommodate 1850 capital letters or 2710 numbers or 1108 bytes or more than 500 Chinese characters, which is dozens of times higher than the content that ordinary bar codes can store. Not only that, it can also encode information such as pictures, sounds, text, fingerprints, and web addresses. At the same time, the three vertices of the square two-dimensional barcode are used as "positioning points", and the reader can read and identify from any direction by identifying the positioning points. Compared with RFID radio frequency technology (applied to ETC electronic toll collection system, etc.), two-dimensional bar codes do not need chips, are easy to encode, can be printed and presented on multiple carriers, and the reading equipment is relatively simple, so they have high efficiency and low cost.

Many users have an experience when scanning a two-dimensional barcode-they don't need to be completely aligned, and sometimes they can read the information by scanning only a part of the two-dimensional barcode. "When supermarket cashiers scan commodity bar codes, bar codes on planes such as boxes can be easily scanned, but for uneven items such as steamed buns and vegetables, bar codes sometimes cannot be scanned out and have to be entered manually," Professor Yang said. "Two-dimensional bar codes have strong fault tolerance. When two-dimensional bar codes are damaged or bent due to perforation or defacement, they can still be read, even if the damaged area reaches 50%, it can still be recovered."

When the mobile phone camera is combined with the two-dimensional barcode recognition software, each mobile phone user has a portable code reader, which can recognize the two-dimensional barcode at any time to obtain various application services. Professor Yang Jianzheng believes that with the popularity of 3G, two-dimensional bar codes provide users with convenient access to functions such as browsing the Internet, downloading applications or online payment. As a more advanced and efficient coding method, two-dimensional bar codes should gradually replace the existing one-dimensional bar codes, but after all, replacement requires cost, so it is more suitable for use in new fields at present. Therefore, in such a period of the rise of two-dimensional bar codes, users should also cultivate the awareness of security of new things, and do not ignore the "self-examination" and "gatekeeping" in the traditional operation process ".

In addition to using outdoor, Yang Jianzheng said that the industry should also carry out standard formulation and self-discipline. "Last year, the two-dimensional barcode special working group of the Internet of Things Technology Product Application Professional Committee of the China Electronics Chamber of Commerce was established. At the end of the year, the national Internet of Things two-dimensional barcode public service platform was launched to formulate and promote two-dimensional barcode technical standards." He said that in addition, some two-dimensional bar code reading software manufacturers have also begun to maintain user safety through embedded anti-virus software and firewalls.