Introduction of network door lock based on vein recognition technology (Photos)

introduction

Vein recognition is one of the latest technologies in the field of biometrics . The principle of vein recognition works: the vein recognition module emits a specific band of infrared rays to a specific part of the human body, and the deoxygenated hemoglobin in the human vein absorbs some of the rays in this band, thereby reducing the reflectance. The recognition module captures the rays reflected from a specific part of the human body, and calculates the vein pattern of a specific part of the human body according to the intensity of the reflected rays. These vein patterns are as individual as human fingerprints. Therefore, these patterns can be used to identify different individuals. In addition, since the venous blood vessels are present in the human body, and the vein recognition module only recognizes the deoxygenated hemoglobin pattern flowing in the veins of the human body, it is very difficult to attempt to imitate the vein pattern of a specific individual. Therefore, vein recognition technology has high safety performance. Palm vein recognition is a commercially available vein recognition technique that recognizes individual targets by capturing vein patterns in the palm of the human hand.

Compared with traditional biometric technology modules, the palm vein authentication module has the following advantages:

1 No need to touch: Because it does not need to be contacted, it is hygienic, which can reduce the user's sense of resistance and is suitable for public places;

2 high recognition accuracy: my rejection rate is 0.01%. The misunderstanding rate of others is 0.00008%;

3 High degree of safety and wide correspondence: the use of internal body information is extremely difficult to forge; 4 applies to anyone.

1 network door lock introduction

The network door lock is based on high-tech products such as radio frequency identification technology, micro controller and related electronic technology, field bus and centralized management of system network. Network door lock system integrates door lock, controller system and management system. Networked via the RS- 485 bus. It can realize local area control system by Ethernet; it has centralized authorization, unified management, real-time monitoring , hierarchical sub-area control, record statistical inquiry, printing, normally open normally closed emergency door opening, alarm and many other functions, with low cost and beautiful appearance. It is easy to install and maintain, safe and convenient.

Network door locks provide a door lock solution with better management mechanism, more convenient use and stronger security for schools, institutions, hotels, office buildings and other places. Especially suitable for occasions such as dense networking applications in schools.

The network door lock uses an IC card instead of the traditional mechanical key to unlock, and the network door lock uses an IC card and a PIN pad in combination instead of a key to unlock. The addition of biometric technology to the network door lock unlocking method further enriches the function of the electronic door lock. At present, fingerprints have been used as a way to unlock network locks. However, the fingerprint identification technology itself has its inherent disadvantages, such as safety and health issues. Therefore, it is a meaningful new attempt to introduce a more secure and contactless vein recognition technology into the network door lock system.

2 network door lock using palm vein recognition

Network door locks using palm vein recognition include main controller, sub-controller, keyboard reader , converter, modifier, card issuer, power system, management software, card, electric lock, wiring network, computer, UPS without interruption The power supply and the palm vein recognition module and its supporting software are shown in Figure 1.

Figure 1 network door lock system connection diagram

This network door lock system not only combines radio frequency identification technology and microprocessor technology. Changed the traditional way of unlocking the key, using the world's unique ID number as the identification information (equivalent to the key) as a legal symbol, and based on this, plus the human palm vein vein as a legal symbol, using advanced electronics Technology, identification and identification of identity. Complete the unlock function.

Before joining the palm vein recognition unit. The system uses the main controller as the control center. Through the software management center, the authorization configuration of personnel, card number and password, and the setting of the hardware system, the sub-controller group is built into the network centralized management control. The sub-controller is responsible for identifying the card number password information and transmitting it to the main controller and performing the action of unlocking and unlocking; the main controller is responsible for identifying the legality of the card number password and issuing the unlocking and locking command: the card reader is the device directly contacted by the user. . Its function is to identify the card number and for the user to enter and change the password.

In order to be compatible with the original network door lock system to the greatest extent, the palm vein recognition unit is provided on the basis of minimum hardware modification and no change of management software. The method used here is to replace the card reader at the position of the card reader using the palm vein recognition unit. as shown in picture 2. In order to be compatible with management software. A "virtual card number" has also been introduced here. That is, when the user registers the palm vein information, the registration system also assigns the user a "virtual card number" (corresponding to the card number of the original IC card). When the user unlocks through the palm vein recognition unit. The palm vein recognition unit first determines whether the user is a legitimate user. If it is a legitimate user, the palm vein recognition unit finds the "virtual card number" corresponding to the user. Send the “virtual card number” as a parameter to the sub-controller through the serial port. Because the communication protocol and format used are the same as when the card reader is sent to the sub-controller. Therefore, the sub-controller receives the recognition success signal sent from the identification unit. Whether it comes from the card reader or from the palm vein recognition unit. They are processed in the manner of the card reader, so that the "virtual card number" replaces the IC card by the palm vein recognition unit. The actual IC card is replaced by the virtual card number. Therefore, the hardware and software units above the sub-controller do not need to be modified.

Figure 2 network door lock sub-control system connection diagram

In addition to the above functions, this network door lock. Because it can be controlled via Ethernet. Therefore, the network management center can monitor the unlocking action and time of the specific room and the user in real time, and can collect the recorded information at regular intervals. Provide query function. The authorization and deletion of the card number password and the registration of the palm vein pattern are convenient and quick. Not afraid of losing and stealing.

3 Conclusion

Currently. All kinds of security access control systems have been greatly promoted in their respective application fields, and the technology is mature. However, the identification of most access control and network door lock systems is based on the use of IC cards or IC cards with passwords. It is relatively rare to use biometrics as the identification of access control. Most of the access control systems that use biometric identification are relatively simple door locks. And fingerprint identification is mostly. Palm vein recognition technology is an emerging technology due to its own unique advantages. It is very suitable for access control systems where high sanitary conditions are required, such as hospitals.

Because of the use of IC cards as an identification system for many identification systems. And occupy most of the access security market. This paper provides a cost-optimized solution for the modification of these types of access control systems and network door locks.

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