The security monitoring system uses optical fibers, coaxial cables or microwaves to transmit video signals in its closed loop and constitutes an independent and complete system from the camera to the image display and recording. It can reflect the monitored objects in real time, vividly and truly. It not only greatly prolongs the viewing distance of the human eye, but also expands the capabilities of the human eye. It can take the place of artificial monitoring for a long time in a harsh environment and people can see it. Everything that actually happened at the monitored site was recorded by a video recorder. At the same time, the alarm system equipment alarms for illegal intrusion. The generated alarm model is input to the alarm host, and the alarm host triggers the surveillance system to record and record.
The composition of the security monitoring system:
Front-end part: The front end completes the shooting of analog video, the generation of detector alarm signals, the control of the pan/tilt, the protective cover, and the alarm output. Mainly include: camera, electric zoom lens, outdoor infrared detector, dual detector detector, temperature and humidity sensor, head, protective cover, decoder, warning lights, siren and other equipment (equipment usage is configured according to the actual needs of users ). The camera uses the built-in CCD and the auxiliary circuit to shoot the scene as an analog video signal, which is transmitted via the coaxial cable. The power zoom lens zooms in and out of the shooting scene, and realizes optical adjustment such as aperture and focus adjustment. Temperature and humidity sensors can detect the temperature and humidity in the environment to ensure a good internal physical environment. PTZ, protective cover provides a suitable working environment for the camera and lens, and can achieve horizontal and vertical adjustment of the shooting angle. Decoder is the core equipment of PTZ and lens control. Through it, it can realize the use of computer interface through software control lens and PTZ.
Transmission section: The transmission section introduced here is mainly composed of coaxial cables. The transmission part requires real-time transmission of images captured by the front-end camera. At the same time, it requires transmission with small loss and reliable transmission quality. Images can be clearly displayed in the video control center.
Control part: This part is the core of the security monitoring system. It completes the functions of analog video surveillance signal digital acquisition, MPEG-1 compression, monitoring data recording and retrieval, and hard disk recording. Its core unit is the acquisition and compression unit. Its channel reliability, calculation processing capability, and convenience of video retrieval directly affect the performance of the entire system. The control part is the key part to realize linkage between alarm and video recording.
TV wall display section: This section completes the display of real-time monitoring signals on the system monitor or monitor screen and the playback and retrieval of video content. The system supports multi-screen playback, simultaneous recording of all channels, system alarm screen, and voice prompts. It is compatible with the unobstructed monitoring function of the traditional TV monitor wall, and greatly reduces the work intensity of the on-duty personnel and improves the reliability of the security defense. The terminal display part actually completed another important task - control. This control includes the camera pan and tilt, lens control, alarm control, alarm notification, automatic, manual arming, anti-theft lighting control and other functions, the user's work only need to click the mouse on the desktop to operate.
Anti-theft alarm part: Install active infrared probes at important entrances and exits, and deploy them. Install an alarm host in the monitoring center duty room (monitoring room). Once a person gets into a certain place, the probe will automatically sense, trigger an alarm, and the host will display an alarm. At the same time, the corresponding searchlight and video camera are linked together, and automatically switched to an alarm camera screen on the host computer. The alarm center monitoring computer pops up the electronic map and makes an alarm record, which prompts the on-duty personnel to handle and greatly strengthens the security. The alarm defense system uses active infrared motion detectors to control important channels and connect them to the alarm center of the management center. When personnel enters from abnormal entrances during non-working hours, the detector will send alarm signals to management immediately. At the same time, the center initiates linkage devices and equipment to warn intruders and can perform continuous video and video recording.
System power supply: The power supply plays an important role in ensuring the normal operation of the entire closed-circuit monitoring and alarm system. Once the power supply is damaged, the entire system will be paralyzed. The power supply of the system can be divided into two parts: centralized power supply and distributed power supply. Users can choose according to actual needs.
The above is only a typical security monitoring system introduction. In practical applications, there will be different types of solutions. Security monitoring system solutions will be tailored according to the different requirements of users.