Choice of system of television supervision. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Choice of system of television supervision. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Security and safety. Audio and video surveillance

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Any television surveillance system includes three functional parts:

- video cameras;

- equipment for processing video information;

- monitors.

According to the method of receiving and processing video information, there are:

- traditional television surveillance systems based on specialized equipment;

- computer systems for television surveillance.

The television surveillance system is designed to visualize video information about the operational situation at the controlled facility. To solve this problem, in accordance with the characteristics of the objects, the system parameters are selected.

The main factors that determine the composition of the television surveillance system include:

- the number of controlled objects;

- speed of system reaction;

- cost;

- ease of management and the ability to work in a slave mode;

- reliability.

The parameters of the elements of the television surveillance system are selected in accordance with the characteristics of the objects:

- dimensions;

- average distance;

- speed of movement;

- lighting conditions.

In television surveillance systems, the maximum number of simultaneously operating cameras is not limited and is determined in each specific case by the ratio of the number of monitors and the capabilities of devices for processing video information.

Usually, the image from most of the cameras is viewed simultaneously, and from the rest - in the paging mode.

Sophisticated television surveillance systems make it possible to obtain a video image of many points of the protected object on television or computer monitors. Monitors and video signal processing equipment are installed in duty rooms or at the company's employees in charge of the security service. In computer systems, a maximum of 16 cameras are displayed on one monitor. With a larger number of cameras, the sizes of individual images are greatly reduced, and the video channels are switched in the mode of scrolling in blocks of up to 16 cameras at the same time.

The visibility of the operational situation is higher in systems with a large number of monitors, since it is possible to display all the cameras normally at the same time.

The speed of processing video information is close to real-time processing and, with the optimal composition of the means involved for this purpose, does not depend on the number of cameras.

In computer systems, the speed of processing video information decreases in proportion to the increase in the number of cameras. More quickly the equipment reacts to the actions of the operator in traditional systems. Digital processing methods allow you to improve the video image, filter noise, highlight and explore individual details.

Author: Korshevr N.G.

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