A security camera is made for surveillance. A security camera system usually consists of one or more cameras and often a recording device. A security camera system is often referred to as a CCTV, which stands for Closed Circuit Television.
The most common security cameras are the following:
- The Bullet security camera, this is a classic camera shape on a base with which the camera is mounted.
- The Dome camera, this is a camera that is in a spherical extra protective sleeve. This camera is used for public areas or work environments. This camera shape is also extremely popular with private individuals, in terms of image quality it is not inferior to the Bullet camera, while it is in an extra protective sleeve and cannot be turned in the wrong direction by unintentional people. We call this type of camera shape the vandal resistant camera. A misconception is that this camera can be controlled remotely, it is the type of PTZ camera.
- The PTZ camera. A PTZ camera can be controlled remotely so that it can be viewed in various directions. PTZ stands for the movements, Pan Tilt Zoom. A PTZ camera is suitable for manned use, such as in work environments or at events. It is less suitable for unmanned camera surveillance.
Other types of camera are cameras specially designed to view license plates, special zoom cameras that can see over long distances, cameras with sound and spy cameras.
The most important thing for a security camera
That is the recognisability of the details. A security camera does not aim to make pleasant pictures, the objective is that when there has been an incident it is possible to check who is responsible and how it came about. It is precisely the recognisability of details that is important so that faces or license plates can come into the picture. Security cameras often have to be able to make recognizable images under difficult lighting conditions, which is why it is very important to purchase a good quality camera.
A misconception is that the resolution is leading in this, it certainly is not. There are 4 elements:
- The quality of the image chip. An image chip is a small device that receives light that is converted into information. This information can be converted into a recording or something that can be followed on a monitor. If the image chip cannot detect many differences in light, the image quickly becomes very white or very black, making things difficult or impossible to recognize. If the chip is very good at detecting small differences, people will see faces and things such as license plates under all circumstances. The market for high quality image chips is dominated by Sony.
- The lens. The lens determines how far you can see, at what distance the image is sharp or sharpest and what angle of view you see. The best thing is an adjustable lens so that everything is optimally displayed in the situation where you want to place the security camera. You can then opt for things like sharpness up close or far away and for a good overview or looking far away.
- Which technique to choose The difference between an analog camera system and a digital camera system can be very large. Digital can be almost 6 times sharper than analog.
- The resolution of the camera, that is of course also important. Security cameras are expressed in a number with a TVL after it and with a P. TVL stands for TV lines which means it is analog. P stands for Pixels and that is digital. An analog recorder can have a high resolution camera, but the image quality never exceeds a number of 600. Digital can theoretically be infinitely sharp, but with the usual equipment it is never possible to view and record more than 1080p.