What is the working principle of the security surveillance camera system?

1. Cameras Generally talking about cameras, it is natural to think of home cameras. In fact, there are many differences between surveillance cameras and home cameras. First of all, the design standards are fundamentally different. One is designed for industrial applications and the other is designed for home use. The requirements are very different; in terms of size, the monitoring machine is small and compact, while the home machine is much larger because all the control parts and tapes are installed in the same casing, and it must be controlled manually on site, and remote control in different places cannot be realized. ; On the key resolution, the home machine is generally about 300 lines horizontally, while the monitor machine is used to record blackboard writing on the blackboard, and the horizontal resolution should be above 400 lines. Each classroom is equipped with a JY-803 integrated color camera produced by JIYEL, with 480TV line center resolution, 1 Lux low illumination, automatic white balance, backlight compensation and automatic electronic shutter adjustment functions, and a built-in 22x optical lens.

2. Lenses are divided into fixed focus lenses and zoom lenses. The focal length of the zoom lens is variable, and the scene can be zoomed in or out to achieve several times the zoom effect. It can be used to clearly capture the writing on the blackboard, and can also capture the whole picture of the classroom, which cannot be achieved with a fixed-focus lens this function. The equipped lens is a motorized triple variable lens, which can be adjusted for zoom, focus and aperture. Zooming can zoom in and out of the picture, change the viewing angle and image size; adjust the focus and aperture to adjust the image clarity. The big head portrait of a teacher or a student in the classroom can be clearly fixed on the entire screen in real time, and can also be pushed to the whole class situation image.

3. The pan-tilt is a device that can drive the camera to rotate left and right, up and down. With it, it can realize all-round video recording in the classroom. Generally speaking, a fixed camera can only see about 60% of the students in the classroom, while using a camera with a PTZ can see all directions in the classroom as well as the podium and blackboard. It can be mounted on the wall or ceiling. The JY-8009 indoor spherical head produced by JIYEL is selected, which has the characteristics of small size and beautiful appearance.

4. Monitor head It is a highly sensitive and compact microphone. Just use the TD-701 series monitor head produced by TD.

5. The protective cover provides a further protective function for the camera, prevents certain damage, and can also play a beautiful decoration and a certain concealment function.

6. The control host is the heart of the system. All other devices must be connected to the control host. It receives your control operations through the keyboard or multimedia software in the computer, and then controls other devices to achieve it, such as: the rotation of the pan/tilt, Lens zoom, focus, aperture changes. It can also adjust the selected camera screen to the monitor you want to display, and can also display the screens of these different cameras in sequence. Each camera displays a certain time, which can be adjusted. This feature is called switching, and it greatly simplifies your operation. The host of this system can be equipped with four keyboards and eight monitors, and can be connected to 64 camera inputs at most, which can fully meet your requirements. Considering the redundancy of system expansion and upgrade, the video and audio matrix switcher adopted, the number of video input channels should be greater than the actual number of channels required, and it is equipped with RS-232 and RS-485 communication interfaces, which can be connected arbitrarily Keyboard main control machine, keyboard sub-control machine, multimedia main control machine, multimedia sub-control machine.

7. There are many differences between a monitor and a TV. The biggest difference is the resolution. The horizontal resolution of a TV is only about 300 lines, while a monitor generally has more than 400 lines. If you want to display the details of an object, such as words on a blackboard, this necessary.

8. The decoder is the "translation" between the host and the front-end equipment. It translates the action commands sent by the host into the driving voltage and power required for pan/tilt rotation and lens changes. Drive the corresponding camera, electric three-variable lens, indoor pan-tilt, etc. to complete various actions.
9. The screen splitter can display up to 16 different images on one monitor at the same time.

10. Security Center The security center is the nerve center of the entire security system. It does not allow non-duty personnel to enter the surface at will. Once a major case occurs, the staff of the security center will be the first to be attacked. Therefore, it is installed at the door of the security center. A Taiwan video intercom system was installed. If someone wants to enter the security center, he must first ring the doorbell to inform the on-duty personnel. The on-duty personnel will observe indoors. After confirmation, just press the switch, and the door will automatically open. This not only ensures the safety of the personnel on duty, but also avoids unnecessary interference from the outside world. The security center is located on the first floor of the comprehensive teaching building. The specific conditions are as follows: The ground is laid with an antistatic raised raised floor, and the raised height is 30cm. In order to ensure the reliable operation of the equipment and system, the power supply is supplied by a dedicated distribution box with a total capacity of 5KW. Cameras and alarms are powered by the dedicated line set of the security center, and are switched on and off by the center. There are ventilation facilities and cabinet air conditioners in the room. The whole system adopts comprehensive grounding, and the grounding resistance is less than 1Ω;

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