1. The monitoring of restaurants needs to install two cameras, one for the cashier and the other for the gate. Because the monitoring area is small, the camera adopts fixed-point mode (it is impossible to control the rotation of the camera and the stretching of the lens).

2. It needs 24-hour day and night monitoring, and the scene has sufficient light during the day and no lighting at night, so the infrared night vision camera is selected.

3. Images should be saved in real time, and video materials should be saved for 3-5 days. The host computer is placed at the cashier.

4. It is required to have network monitoring function, be able to watch monitoring images in real time through local area network, and be able to retrieve video materials remotely.