Design and analysis of embedded access control monitoring system based on ARM9 and Linux

　　4.4 Circle Image Monitoring

　　When the cardholder opens the door, the access controller will record the legal card swiping information into the database, and save the image of the card swiping moment as a jpg image in the storage device of the access controller. System registered users can browse the images saved by the access controller through the browser on the client. The system log interface is shown in Figure 4.

Figure 4 System log interface

　　4.5 Backend Services

　　After the access control controller is started, it continuously detects whether the card reader has a signal to verify whether the door needs to be opened. When a card swiping message is detected in the card reader, the information in the card is read and the corresponding database is called for matching. If the match is successful, the image at the moment is recorded and saved to the corresponding directory of the database, and the door is opened; if unsuccessful, an alarm signal is issued and the operator cannot open the door.

　　5 Conclusion

　　The access control monitoring system effectively guarantees the security of enterprises and institutions. The embedded access control monitoring system based on ARM9 and Linux has stable and configurable characteristics, supports Internet-based data transmission, and adopts a B/S architecture system. Users access the system through a browser. This solution describes in detail the software idea of ​​implementing this access control monitoring system and describes the implementation process in detail. At present, this solution has been put into use in production and scientific research. With the development of embedded technology, the performance of the access control monitoring system will be further improved.