Fast recognition of QR code access control

Two-dimensional code is also called two-dimensional bar code. The most common form is QR Code. QR is called Quick Response. It is a very popular encoding method on mobile devices in recent years. It can store more than traditional Bar Code. Information can also represent more data types.

Two-dimensional bar code/two-dimensional bar code (2-dimensional bar code) uses a certain geometric figure to record data symbol information in a black and white pattern distributed on a plane (two-dimensional direction) according to a certain law; in the code preparation skillfully Using the concept of "0" and "1" bit stream that constitute the internal logic of the computer, several geometric shapes corresponding to the binary system are used to represent the text value information, and the information is automatically read by image input equipment or photoelectric scanning equipment to realize the information Automatic processing: It has some common features of barcode technology: each code system has its specific character set; each character occupies a certain width; it has a certain check function, etc. At the same time, it also has the function of automatically identifying different lines of information, and processing graphics rotation change points.

Comparing the traffic rate by swiping card, QR code, and face in three mainstream door opening methods, swiping card> QR code> face. The card access control is gradually replaced by the QR code access control due to the shortcomings of easy copying, easy loss, and difficult management.

The passage efficiency of QR code access control is mainly determined by the length of the character string. From the external aspect, the denser the QR code, the more information it contains and the longer the character string. After Linglingkaimen launched the shou mobile phone QR code access control in the industry, after several further upgrades to the QR code recognition rate, on the basis of ensuring information security, the character length is continuously simplified to achieve the recognition of QR code access control equipment. Not higher than 150ms.

During the rush hour, the average efficiency of the subway scan code is 40 people/minute, and the average efficiency of the QR code access control of the office building can reach 51 people/minute. At the same time, in March this year, in order to prevent the epidemic, the Beijing Metro Hand in hand with Lingling Kaimen to launch the subway reservation service, the traffic efficiency reached 60 people/minute.