With the construction of safe cities throughout the country, video work services have played a pivotal role in maintaining urban security. However, in actual situations, some video surveillance points have problems such as lack of systematic planning and lack of scientific design. How to choose monitoring points more accurately? And what do you need to pay attention to when selecting and installing the camera type?
Monitoring point planning
According to the characteristics of key areas, combined with the existing monitoring points and according to the actual needs of the war, put forward the planning ideas of “encirclement, supplement, connection and cooperationâ€:
Wai: As the name suggests, it is to surround the target area to form a closed circle. The first is to control all intersections entering and leaving the city, the second is to control all entrances and exits in the main city, and the third is to control the entrances and exits of the local jurisdictions to ensure 100% effective coverage of the main entrances and exits, to achieve clear images of any people, vehicles, objects, etc. Effective coverage is achieved at all access points.
Connected: Control all key parts, key places, key parts around the entrance and exit, combined with the distribution of surrounding cameras in accordance with the main urban roads into a line, connected into a circle, forming a number of interconnected closed circles, to ensure that the moving target can be captured multiple times.
Supplement: the supplementary points for all kinds of closed circles: to ensure that the target can reach clear coverage when passing through the closed circles of each layer, and reasonably plan the closed circles that overlap each other in each jurisdiction to avoid repeated construction and leakage construction; Point: It is mainly to send out the suo closed circle, and to supervise the monitoring points of key units, key places and key parts that have been classified, especially in areas with high incidences, etc., according to the actual situation, select the camera type to make up the point.
Integration: Integrate social resources and give play to the auxiliary role of social resources in security prevention and control. In particular, the video resources of closed and closed key units should be fully utilized to form a powerful complement to the closed circles of each layer.
Some principles of installation
1. Selection of pole position when considering environmental factors
(1) The distance between the pole point and the pole point is not less than 300 meters in principle.
(2) In principle, the position of the pole should be no less than 5 meters from the monitoring target area, and the longest distance should not be more than 50 meters, so as to ensure that the monitoring picture can contain more valuable information.
(3) Where there is a light source nearby, it is preferred to use the light source. However, be aware that the camera should be installed in the same direction.
(4) Try to avoid installation in places with high contrast. If it must be installed, consider: 1 Turn on the exposure compensation (the effect is not obvious); 2 Use the fill light; 3 Set the camera of the underground channel outside the entrance and exit; 4 Set in the channel A little bit.
(5) Position the pole as far as possible to avoid green trees or other obstructed objects. If it is necessary to install, consider avoiding the obstruction of trees or other obstructions, and leave room for future growth of trees.
(6) Pay attention when investigating, try to get electricity from Jiao police signal, street light distribution box, government, larger enterprises, institutions (such as government departments, bus companies, water supply groups, hospitals, etc.) Improve the stability of electricity consumption. Try to avoid small business users to take power, especially for civilian use.
(7) The gun mounted on the side of the road, pay attention to the reverse shooting of pedestrians, non-motorized roads and pedestrians' facial features.
(8) The camera installed at the bus station should be placed in the rear of the vehicle as far as possible to avoid the headlights of the vehicle and facilitate the capture of the boarding personnel.
2, the choice of poles for different cameras
Reasonable selection of the rods, to avoid the camera being blocked in the selection of social security monitoring rods, according to different camera types, try to choose the height of the manuscript to meet the most ideal monitoring effect: 3. 5-5. 5 meters height Can be used as the height of choice.
(1) Selection of gun camera height
For the selection of gun-type camera poles, try to choose the type of rods with relatively low height, usually choose the pole with a height of 3.5-4.5 meters.
(2) Selection of the height of the dome camera
The dome camera can be rotated 360 degrees and the focal length is adjustable. The selection of the rods of all spherical cameras should be as high as possible. Usually we choose the type of rods between 4.5 and 5.5 meters. For the above-mentioned rods of various heights, a reasonable cross arm length should be selected according to the distance between the position of the pole and the position of the monitoring target and the viewing direction, so as to avoid that the cross arm is too short to capture suitable monitoring content. In an occluded environment, 1 meter or 2 meters of cross arm should be chosen to reduce occlusion.
Camera type selection
The basic principle of surveillance camera selection is to meet the actual business application, combined with the specific situation of monitoring the site and target range, scientifically and rationally select the camera type.
(1) High-definition cameras should be adopted in high-incidence locations, public complex sites, key sensitive areas prone to mass incidents, major road sections, crowded areas and important guard targets;
(2) In the monitoring points such as key parts, key units, parks, plazas, scenic spots and traffic sections, if it is necessary to monitor a wide range of areas and overall scenes, it is necessary to identify the facial features of the personnel through lens zoom and pan/tilt control. For vehicle license plates and local scenes, high-speed dome cameras or pan-tilt guns should be used;
(3) In the back alleys, deviated sections, monitoring blind areas, etc., there are fewer vehicles and more parts to be monitored, and there are many angles. It is advisable to use smart dome cameras with preset point cruise and pattern scanning;
(4) For nighttime ambient lighting conditions are relatively poor, and it is not suitable for the use of incandescent light fill monitoring points, infrared cameras or star-level cameras should be used.
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