What are Video Surveillance Systems?

The monitoring system is composed of 5 parts: camera, transmission, control, display, record registration. The camera transmits video images to the control host through coaxial video cables, network cables, and optical fibers. The control host then distributes the video signals to various monitors and recording equipment, and simultaneously records the voice signals that need to be transmitted to the recorder. Through the control host, the operator can issue instructions to control the up, down, left, and right movements of the gimbal and adjust the zoom and zoom of the lens. The control host can also be used to control multiple cameras and gimbals. Switch between. Utilizing a special video processing mode, you can perform operations such as recording, playback, and processing on images to achieve the best video results.

Video surveillance system

Networking of video surveillance system, using traffic video surveillance as an example, as shown in the figure below.

The system innovatively realizes the integration and linkage of video surveillance and conferences, which can flexibly and effectively manage remote devices. Through the recording, playback, linkage alarm, monitoring strategy formulation, emergency command and other applications of remote monitoring objects, the dual functions of monitoring and communication are achieved.

Its biggest feature is that it supports viewing video images from mobile terminals such as smartphones / tablets, and supports the transfer of monitoring images into video conferences to implement emergency command and remote dispatch.

Video surveillance system products include optical transceivers, optical cable terminal boxes, gimbals,

The video surveillance system consists of a real-time control system, a surveillance system, and a management information system. The real-time control system completes the functions of real-time data collection processing, storage, and feedback; the monitoring system completes all-weather monitoring of various monitoring points, and can switch multiple images at multi-operation control points; the management information system completes the collection of various required information , Receiving, transmitting, processing, and processing are the control cores of the entire system.

With the rapid development of the national economy and the rapid development of information technology and network technology, the application of monitoring systems in various industries is becoming more and more widespread. The monitoring system is no longer solely used in communications, transportation, security and other industries. It is gradually developing towards other industries and the public. With the rapid development of computers, networks, and image processing and transmission technologies, video surveillance technology has also made considerable progress. The social security situation is becoming more and more complicated, public safety issues are continuously highlighted, urban crimes are prominent, and means are constantly updated and upgraded. These are urgent requirements to accelerate the development of active surveillance-based video surveillance systems. Since the United States "

At present, for the monitoring system, the user's demand for its functions has reflected diversity and systematization. The requirements are mainly reflected in the following aspects:

remote access. Traditional video surveillance is generally carried out in a small area, and users generally require that the access location is not restricted by the region, and that they can visit the monitored location anytime, anywhere.
Multiple people visit the same monitoring point at the same time. Traditionally, a monitoring point is generally accessed by a monitoring center (user). The same monitoring point is likely to be accessed by multiple users at the same time, and there may be no relationship between these users. The complexity of user access will require the system to strengthen the management of access rights.
Monitoring points tend to be scattered, while monitoring tends to be centralized. The monitoring points belonging to the same user are becoming more and more scattered, regardless of the region. For these scattered monitoring points, centralized management and control are required.
The monitoring system is required to be open and expandable. The same system should support multiple different types of monitoring equipment, and the number of users and the number of monitored points can be easily increased or decreased.
Massive data storage. Networking enables the traditional local video recording function to be transferred to a remote server for implementation, making mass data storage possible. At the same time, the system is also required to have stronger storage, retrieval and backup functions.
information security. The complexity of the system, the diversification of users, and the business characteristics of video surveillance itself inevitably require the system to provide a strong guarantee for information security.
Intelligent video surveillance. The future video surveillance system will not only be limited to passively providing video pictures, but also requires the system itself to be intelligent enough to recognize different objects, find abnormal conditions in the surveillance picture, and issue alerts and alarms in the fastest and best way. Provide useful information to help security personnel more effectively handle crises and minimize false positives and false negatives, becoming a powerful tool for responding to attacks and handling emergencies. Intelligent video surveillance can also be applied to a variety of non-security related scenarios such as traffic management, customer behavior analysis, customer service, etc., to improve user return on investment.

Large-scale network video surveillance system business is still in its infancy. Networking, digitalization, and intelligence are the inevitable trends of video surveillance. In the face of this megatrend, video surveillance has many deficiencies in some key technologies, mainly in the following areas.

Media distribution

The video surveillance system generally handles the distribution of video media relatively simply. Generally, users directly

Video surveillance system principles

Eight principles of video surveillance system With the increase of security awareness, the video surveillance system has gradually entered our ordinary people's home. Video monitoring solutions are also emerging, so what principles should be followed in installing a monitoring system? The following 8 monitoring and installation principles must be considered when installing a monitoring system:

1. The real-time nature of the monitoring system is particularly important. It is precisely because of the real-time nature of the monitoring system that the monitoring system is so necessary.

2. Security, the monitoring system has security precautions and confidentiality measures to prevent illegal intrusion into the system and illegal operations.

3.Scalability

The monitoring system equipment adopts a modular structure. The system can be easily and flexibly expanded in hardware and software when the monitoring scale, monitoring objects, or monitoring requirements change, that is, the network structure and main software and hardware equipment do not need to be changed.

4.Openness

The monitoring system follows the principle of openness. The system provides interfaces and tools in accordance with international standards in software, hardware, communications, networks, operating systems, and database management systems, so that the system has good flexibility, compatibility, scalability and scalability. Portability. The entire network is an open system, compatible with products from multiple monitoring manufacturers, and supporting secondary development.

5, standard

The equipment and technology adopted by the monitoring system conform to international universal standards. This can give you a peace of mind.

6.Flexibility

The network system of the surveillance system is flexible, and the system function configuration is flexible, which can make full use of the existing video surveillance subsystem network resources. The system integrates other subsystems into it, which can meet the business needs of different monitoring units, with comprehensive software functions and easy configuration.

7, advanced

The monitoring system is as advanced as possible on the premise of satisfying reliability and practicality. The entire system remains advanced within ten years after its completion. The equipment and technology used by the system can adapt to future development and can be easily upgraded. It will become an advanced security system that is suitable for future development, high reliability, good confidentiality, easy network expansion, strong connection data processing ability, and simple system operation and control.

8, practicality

The video surveillance system has the ability and standard to complete the functions required in the project. The system meets the requirements of relevant domestic and foreign codes for the actual needs of the project, and is easy to implement and easy to operate. From the perspective of the user, make full use of the existing resources, try to reduce the system cost as much as possible, so that the system has a higher performance-price ratio.

Video surveillance system solution

Interference is a common problem encountered in security monitoring systems. For example, snowflake interference, moire interference, twill interference, horizontal interference, up and down scroll bar interference, distortion distortion interference, and up and down jitter interference may all interfere with the normal operation of the video surveillance system. The specific solution depends on the situation.

First, find the source of interference

We can find the source of interference in a simple way. The three major sources of interference are: the front end-interference from the camera system; the middle end-interference from coaxial cable transmission; and the back end-interference from the device.

How to check video interference

Use the monitor on the front end to connect with the camera to see if there is interference in the image. If there is interference, solve it from the camera itself (such as replacing the million HD digital network dome camera). If there is no interference, go to the next step to check.

In the monitoring room, disconnect the coaxial cable transmission line from the video distributor or hard disk recorder, and connect the monitor separately to see if the image has interference. If there is interference, use an anti-jammer. This kind of interference is called "environmental electromagnetic interference", and this kind of interference is more common. If there is no interference, the coaxial cable transmission line is not interfered. However, interference occurs as soon as it is connected to the hard disk video recorder, which indicates that the ground potential difference between the system equipment causes interference. Adding a photoelectric isolator between the video cable and the hard disk video recorder can solve the problem.

Third, the solution to video interference

Front-end interference resolution ideas: The interference introduced by the front-end camera system is equipment interference, and should be solved from the equipment itself (such as camera quality, voltage stability, and insulation). The interference problem cannot be completely solved with anti-jammers.

Mid-range interference resolution ideas: The most common interference from the mid-range to coaxial cable transmission is "environmental electromagnetic interference". Electromagnetic interference refers to interference from the surrounding environment of the video line, including interference from variable frequency motors; electromagnetic radiation interference; high frequency and low frequency Equipment interference; interference from television towers and substations; strong pulse interference caused by high-power electrical appliances such as motors, etc. can be solved with video anti-jammers, such as K1000.

Back-end interference resolution ideas: Back-end equipment interference is mostly caused by the ground potential difference between the equipment, which causes diagonal lines and horizontal bars to scroll up and down (scroll bars), which can be solved by photoelectric isolators, such as single-channel photoelectric isolation Jammer K2000, multi-channel photoelectric isolation distributor F1600G.

Fourth, power interference

Video interference due to poor quality power is more common in front-end interference. In the past, some camera manufacturers chose linear power supplies for careful consideration. However, the linear power supply has the disadvantages of low conversion efficiency, large volume, high heat generation, and high manufacturing cost. Today, the stability of switching power supplies has improved a lot, and well-made and well-used switching power supplies have become the mainstream of camera power supplies. It is recommended that when purchasing a security monitoring power supply for surveillance cameras, test the power supply as much as possible to check its quality indicators such as stability and ripple size.

Five, the most suitable installation location of video surveillance system

Companies specializing in the rendering and construction of intelligent security system projects for campuses, companies, factories, and industrial areas. Project locations:

a. Factory entrance and campus entrance

b. Closed-circuit monitoring of the factory building

c. Closed-circuit monitoring of the perimeter fence

d. Closed circuit monitoring of production workshop

e. Treasury closed circuit monitoring

f. Closed-circuit monitoring of office finance room

g. Closed-circuit monitoring of dormitory anti-theft

Anti-theft alarm system access control attendance system patrol for induction wiring