What’s the difference between QR code and RFID tag?

what is RFID tag?

RFID is a non-contact automatic identification technology, any item can be mobile identification, for any items to items, from the production to the consumer. In the hands of each link to track and record product logistics information. It through radio frequency signal automatically identify target objects and access to relevant data, identify work without human intervention, it can work under all kinds of harsh environment. RFID system mainly consists of electronic tag, antenna, reader, middleware and host.
The basic working principle of RFID technology:
The basic working principle of RFID technology is not complicated: the tag get into the magnetic field, after receiving radio frequency signal from the read/write device, with the energy gained by the induced current send product information stored in the chip, or take the initiative to send a frequency signal.
The reader reads the information and decodes and sends it to the central information system for data processing. RFID technology has the advantages of high security and information control. In the process of using RFID, it can effectively reduce the cost of goods and effectively control the generation of fake and inferior commodities.Therefore, RFID tags are indispensable identification tags for items entering the Internet of things.

what is QR code?

Both QR code and RFID technology are considered to be the replacement products of bar code, and their recognition and authentication of objects is the key link of the Internet of things.They have the characteristics of large storage information and high security.
One-dimensional bar code are familiar. In a book, CD or have a bar code on the food packaging bags, a dimensional bar code is mainly made up of black and white stripes, composed of English letters or Arab Numbers at the bottom of the stripe sequence, is mainly used to store the information of goods. The QR code usually is square structure, lattice form, with black and white symbol information geometry to record data, is made up of a particular geometric figure according to certain distribution on the plane.
Because the QR code is both horizontal and vertical, the information storage is large and the bar code occupies a small area when compared to the one-dimensional bar code. The information recorded in the QR code can be automatically identified and read by the image input device or image scanning device. The one-dimensional bar code can record the basic information of the commodity, but cannot provide the detailed information of the commodity. If necessary, we will query the detailed information of the corresponding bar code through the database.And the QR code does not need the database to view the detailed information of the commodity, simple and convenient.
Compare
Firstly,in terms of the production cost, the QR code is the same as the one-dimensional bar code ,which is almost free information shortage technology. The QR code mainly transfer the information to some special figures which computer can easily recognize through an algorithm.Then put these special figures on the product, for the reason that the cost of printing a special figure is all depend on the value of the tag, so the cost is approaching zero. The difficulty of RFID technology in promotion and use is its high cost. Each RFID tag costs average above 1 dollar