Video Security Monitoring System Technical Requirements Related Specifications

The video security monitoring system generally consists of four main parts: front-end, transmission, control, and display recording. The front-end part includes one or more cameras and its associated lens, pan/tilt, protective cover, decoding driver, etc. The transmission part includes cables and/or optical cables, and possible wired/infinite signal modulation and demodulation equipment, etc.; control part Mainly includes video switcher, PTZ camera controller, operating keyboard, various types of control communication interface, power supply and supporting console, monitor, etc.; display recording equipment mainly includes monitors, video recorders, multi-screen splitters.

Depending on the purpose of use, the scope of protection, information transmission methods, and control methods, the video security monitoring system can have a variety of constituent modes. This standard only proposes common technical requirements for the common parts of various types of food monitoring systems. The basic components of the common parts of various video surveillance systems are shown in Figure 1.

System Function Requirements Overview The system should have the basic functions of image signal acquisition, transmission, switching control, display, distribution, recording and playback.

Video detection and image signal acquisition Video detection equipment should be able to clearly and effectively (in the case of well-supported transmission and display equipment) detect the scene of the image, reaching the level of four (including four) or more image quality levels. For a site with a particularly poor electromagnetic environment, the image quality should not be lower than three.

Video detection equipment should be able to adapt to the lighting conditions in the field. When the ambient illumination does not meet the food monitoring requirements, auxiliary lighting should be configured.

The protective measures of video detection equipment should be coordinated with the site environment and have corresponding equipment protection levels.

Video detection equipment should be compatible with the scope of observations. When necessary, fixed target monitoring is used in conjunction with moving target tracking.

Control According to the scale of the system, an independent video surveillance room may be set up, and a joint monitoring room may be set up together with other systems to monitor and control the indoor placement of the center control equipment, and provide on-duty personnel with a place to watch.

The monitoring room shall have preventive facilities to ensure the safety of equipment and on-duty personnel.

Operational control and functional operation of the video surveillance system should be performed on the console.

Large-scale systems should be able to monitor front-end video signals and give warnings of food signal loss.

The system should be able to operate manually or automatically and remotely control various actions such as cameras, pan/tilts, lenses, and shields.

The system should be able to manually switch or program automatic switching, and all video input signals are fixed or time-sequentially displayed on the specified monitor.

Large and medium-sized systems should have a storage function, and all programming settings, camera numbers, time, and address information can be maintained when the utility power is interrupted or shut down.

Large and medium-sized systems should have an excuse to interact with the alarm controller. When an alarm occurs, the image of the corresponding camera can be switched and displayed and recorded.

Other functional configurations of the system should meet the requirements for use and redundancy. Large and medium-sized systems should have the ability to switch synchronously with audio.

According to user requirements, the system can set up sub-control facilities. Sub-control facilities should usually include control equipment and display equipment.

The system linkage response time should be no more than 4s.

Signal transmission signals can be transmitted using wired and/or wireless media, using methods such as modulation and demodulation, and can be transmitted using dedicated lines or public communications networks.

All kinds of transmission methods should strive for the consistency and completeness of the output and input of the video signal. The signal transmission should ensure the image quality and the accuracy of the control signal (response in time and prevent malfunction).

The signal transmission should have anti-leakage measures. The wired line transmission should have anti-signal leakage and/or encryption measures. The cable public network transmission and wireless transmission should have encryption measures.

The image display system should clearly show the images captured by the camera. That is, the resolution of the display device should not be lower than the overall requirement of the system image quality level.

The system should have text prompts for the image source, date, time, and status of operation. Video signal processing and recording/playback The video motion alarm and video signal loss alarm function can add necessary facilities according to the user's requirements.

When a combination of multi-screen display or coded recording is required, a video signal processing device, a multi-picture splitter, should be provided.

According to needs, the following video signals and live sounds should be stored using the image and sound recording system:

a) image signal and sound signal at the scene of the incident and its entire process;

b) image signals and sound signals when an alarm occurs at a predetermined location;

c) Dynamic site information that the user needs to master.

All or selective records of the source of the image, the time, date, and other system information should be available. Alarm recordings for particularly important fixed areas should provide image recording before the alarm.

The storage time of recorded image data should be reasonably determined according to the application and management needs.

The recording mode of the image signal can be analog and/or digital, and it should be comprehensively considered based on such factors as the recording cost and the validity of legal forensics (the uniqueness and non-modification of the record content).

The system should be able to playback the recorded images and sounds correctly. The playback effect should meet the requirements of 4.3.4.1. The system should be able to correctly retrieve the time and location of the recorded information. The system grading system can be classified according to its scale, function and equipment performance index. Recommended Rating Method Power Supply Range The video security monitoring system's power supply range includes all system equipment and auxiliary lighting equipment.

The power supply always requires the power supply unit of the video security monitoring system's proprietary equipment. It should have a regulated power supply and a backup power supply.

The regulated power supply regulated power supply should have a purification function, and its nominal power should be greater than 1.5 times the total power used by the system. Performance in line with the provisions of GB/T 15408.

Standby power backup power (can not supply auxiliary lighting as required), its capacity should at least ensure that the normal working time of the system is not less than 1h. The backup power source can be one or a combination of the following.

- Secondary power supply and charger - UPS power supply - Backup generator front-end equipment supply mode Front-end equipment (excluding auxiliary lighting devices) Power supply should be reasonably configured and centralized power supply should be adopted.

Auxiliary lighting power supply The auxiliary lighting power supply can be reasonably configured according to site conditions.

The power supply security requires that the power supply should have lightning protection and leakage prevention measures and have a safe grounding.

Installation requirements Installation method The installation method of front-end equipment should meet the requirements of GB50198.