One, two-dimensional code introduction
The two-dimensional code and RFID technology are considered to be alternatives to one-dimensional barcodes. Their recognition and authentication of objects is the key link of the Internet of Things. Compared with the one-dimensional bar code, they have the characteristics of large amount of stored information and high security. One-dimensional barcodes are all familiar to us. There are one-dimensional barcodes on books, CDs or food packaging bags. One-dimensional barcodes are mainly composed of black and white stripes. There are sequences of English letters or Arabic numerals under the stripes. Store product information. The two-dimensional code is usually a square structure and is in the form of a dot matrix. Using black and white geometric figures to record data symbol information is a certain geometric pattern distributed on the plane according to a certain rule. Since the two-dimensional code uses both horizontal and vertical information to store information, the storage of information is relatively large when compared to the one-dimensional bar code, and the area occupied by the bar code is small. The information recorded in the QR code can be automatically recognized and read by an image input device or an image scanning device. One-dimensional bar code can record the basic information of goods, but can not provide the detailed information of the goods. If necessary, we need to query the details of the corresponding bar code through the database. The two-dimensional code does not require a database to view detailed product information. It is simple and convenient. The following figure is a common two-dimensional code:
Second, RFID tag introduction
RFID technology is a wireless radio frequency automatic identification technology that can identify any item on the move. It can track every link from the production to the consumer and record the product's logistics information. RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work can be performed in various harsh environments without manual intervention. The RFID system is mainly composed of an electronic tag, an antenna, a reader, a middleware and a host. The basic working principle of RFID technology is not complicated: after the tag enters the magnetic field, it receives the radio frequency signal from the reader, sends the energy stored in the chip by the energy obtained by the induced current, or actively sends a signal at a certain frequency; The reader reads the information and decodes it, and sends it to the central information system for data processing. RFID technology has high anti-counterfeiting and information control advantages. In the process of using RFID, it can effectively reduce the cost of goods, but also effectively control the production of fake and shoddy goods. Therefore, RFID tags are indispensable identification tags for items entering the Internet of Things.
Third, two-dimensional code and RFID tag comparison
First of all, in terms of production costs, two-dimensional codes, like one-dimensional bar codes, are almost zero-cost information storage technologies. The two-dimensional code is mainly used to transform information into special graphics that can be easily recognized by computers through certain algorithms. Such special graphics are printed on items because the cost of printing or printing a special image is only the value of the label itself, so the cost Nearly zero. The bottleneck in the promotion and use of RFID technology stems from its relatively high cost. Each RFID tag has a cost of more than US$1. For a small commodity, the price of an electronic tag is higher than the price of the product itself. There are many prices, so the average vendor or seller is unbearable. At present, although various methods have been adopted to reduce the cost of labels, it will take a long time to truly reach the prices that are acceptable to the general public.
Secondly, from the point of view of application, the use of two-dimensional codes on products must be performed by scanning the device to read data. If there are many products to be processed, the two-dimensional codes of each product must be read by the scan code device. information. If inventory is taken at a large warehouse, workers have to climb up and down to search for the QR code of each commodity with the scan code device, which is time-consuming and laborious. However, in this regard, RFID has shown a very prominent advantage. If each product is equipped with an RFID tag, then workers can simply read the data on the reader in the office, saving time and effort.
Let's take a look at the ETC channel of the expressway. In order to save costs, some highways have ETC lanes, and some vehicles will be charged for no parking. The non-stop charging not only effectively reduced the number of highway management personnel, but also solved the problem of congestion at highway toll gates. Its implementation is relatively simple. RFID tags need to be installed on high-speed vehicles. Readers are installed on the toll gates of expressways. When vehicles pass through ETC channels, the readers automatically read information about vehicles on RFID tags. The database queries the corresponding information, compares the vehicle's identity, and automatically deducts the vehicle's charge for high-speed charges. This non-stop charge can only be completed by RFID tags, which cannot be completed in the two-dimensional code. If we paste the two-dimensional code on the vehicle body, can we also install non-stop parking at the toll gate of the freeway to complete parking charges? The answer is negative. On the one hand, the application of two-dimensional codes on the vehicle body affects the aesthetics of the vehicle. Some owners may not agree. On the other hand, the scanning device needs a very short distance to read the QR code, which requires the owner to have a good driving technology, and the scanning process of the QR code is not as fast as the reading speed of the RDIF tag, even if it does not stop Scanning code also requires slow speeds, which is not realistic. Therefore, the current use of two-dimensional code can not be achieved without parking fees.
The two-dimensional code should have a better application in mobile e-commerce. We use Taobao, the e-commerce trading platform that is currently relatively hot, as an example. In order to improve the competitiveness of the shop on Taobao, many merchants have produced their own QR codes. Buyers can scan the QR code through the mobile phone to enter the shop's website to learn about the shop's credit, sold goods information, and receive store discounts. Coupons and so on. This low-cost promotion method is very popular with buyers and it also increases sales at stores. This two-dimensional code applied in mobile e-commerce has an absolute advantage and cannot be replaced by RFID tags.
Finally, let's take a look at their security. RFID technology will send out radio frequency signals from time to time. We can read the position of RFID tags through the reader, which is not conducive to privacy protection.
Fourth, the conclusion
Through the above comparison, it can be seen that each type of automatic identification technology has certain application advantages and limitations, and the coexistence of multiple technologies can give full play to their advantages and can complement each other's shortcomings. According to different use environments and technical conditions, combined with the characteristics of the object being used, we can use different identification technologies. For example: At present, RFID technology has a better application in car networking, and in mobile e-commerce, QR codes have also achieved good results. Making good use of these identification technologies can bring about great changes in our production efficiency and living standards. Realize the "intelligence" of life as soon as possible.