To determine the placement of the camera during installation, we must consider several factors. As mentioned in the Camera selection section, the objectives of monitoring are to be decided on the type of camera to use and where to place the camera.
To obtain a useful image, not just point the camera at an object. The lighting, the angle, reflections, dead zones and the zoom factor for PTZ cameras are factors to consider. Avoid the light and minimize glare are other factors to be taken into account. In some environments, to solve problems in difficult scenes is easier to modify the same environment.
The camera placement is also an important time factor deter vandalism. If placed out of reach on high walls or ceilings, you can avoid most spontaneous seizures. The downside is the viewing angle, to some extent, be compensated with a different purpose.
The purpose of each chamber must be specified clearly. If the purpose is to obtain an overview of an area to track the movement of people or objects, make sure that a camera suitable for this task is placed in a position to help achieve this goal.
If the intention is to identify a person or object, the camera must be positioned or focus so that captures the level of detail needed for identification purposes. The local police authorities may also provide guidance on how best to position the camera.
Field of View
The quickest way to find the focal length of the lens required for a field of view is to use a calculator or rotating lens calculator online goals. Both are available from Axis: Calculator objectives
The size of the image sensor of a network camera, usually 1/4 “, 1/3”, 1/2 “and 2/3”, should also be used in the calculation. The disadvantage of using a lens calculator is that it ignores any possible geometrical distortion of a target.
The distance from the camera to the object
Wide area coverage with capture points
A camera provides a full view of the scene, but probably will not provide enough detail to identify people in the area. If this is one of the objectives of surveillance, you will need an extra camera in the design. Now, when a person enters a wide area, identification is possible. The related information about where and how many people are in the room can still be obtained objectively using extra large camera angle.
To properly place the camera, lighting considerations are crucial. Normally, it is easy and profitable add foci of intense light situations both indoors and outside in order to get the lighting conditions needed to capture good images.
In the installation of cameras outdoors, it is important to consider how sunlight varies during the day. It is also important to avoid direct sunlight and that “will blind” the camera and can reduce the performance of the image sensor. If possible, position the camera so the sun shine from behind the camera.
The problem with backlight typically occurs when attempting to capture an in front of a window object. To avoid this, modify the environment by repositioning the camera or use curtains or blinds and close plants if possible. Carpet can also be used to minimize reflections in a situation like this, and thus reduce the amount of backlight. If you cannot reposition the camera, add front lighting. Cameras that support a wide dynamic range better resolve a situation backlight.
In the installation of cameras outdoors, it is important to consider how sunlight varies during the day. At sunset, the camera with a cross in Figure 13 should look in the direction of the sun.
If we have to monitor the exterior of a building, the placement may be affected in varying degrees by sunlight. Place the camera in the place where sunlight has less impact.
Detection areas and dead zones
Ranges / different areas of the chamber are shown in Figure XX. The closest to the camera online is where the maximum height is detectable. The yellow line shows the minimum detectable height needed. The detection zone is between these lines. These factors must be addressed at the time of installation to ensure adequate coverage of camera.
The field of vision must be proven vertically and horizontally. Often planning is based on floor plans that provide a top view of the area. The side view should also be considered to ensure the desired coverage.
The camera and the angle of the object
By placing cameras in hallways or doors, be careful and avoid high angle view. As you can see from the pictures, the higher the angle the object, are more difficult to recognize facial features. As you can see, an angle of 10-15 degrees is the best option for facial identification. Furthermore, the higher the positioning of the camera away from the scope of vandals. All this has to do with the purpose of surveillance, is the identification necessary?