The focal length corresponds to the distance between the camera and the image forming plane. The greater this distance is, the smaller is the field of vision. Here we find the terms 25mm, wide angle, 50mm and standard.The lens is what is used to define the plane path. It is convergent or divergent with regard to light.
- The aperture also known as the diaphragm allows you to adjust the light flow of the lens.
- The image sensor is what allows the camera to pick up a light signal. CCD sensors will be favored here over CMOS sensors.
- The chipset corresponds to the management of data flows and in particular makes it possible to transform the light signal into a distinct and precise image.
- Compression compresses the data in order to reduce it during storage with the formats MJPEG, PEG4, H124 or several possible formats for certain camera models.
- Encoding corresponds to the transformation of video into computer format.
- The scanning corresponds to the sharpness of the image.
- The brightness or Lux corresponds to the minimum amount of light needed to take the camera. This data ranges from 0 to 50,000 with 0 for total black and 50,000 for maximum brightness.
- White balance is the system that corrects the coloration of the image.
- The degree of protection concerns the tightness of the device.
- Finally, UPnP corresponds to real-time retransmission to a screen or multimedia support.
Choose your video surveillance equipment according to the focal length:
Depending on where your camera will be placed, the choice of focal length is of course very important because it will determine the area to be covered. Go for the cctv systems london there.
To see more clearly, note that a focal length of 2.1 mm films over 6 meters away and over 14 meters wide and that the larger the focal length, the longer the shooting distance will be while the width of the shot of view will shrink.
It is however possible to find variable focal length cameras which will be ideal if you do not yet know where you will place your camera and how far you will need to film.
Choose your equipment according to the protection index of the camera:
Another data to take into consideration concerning video surveillance cameras concerns the level of protection of the camera and any electrical or electronic device in a more general way and in particular if you wish to place your equipment outside. This level of protection is represented by two numbers which you can interpret in this way:
Conclusion
The 1st digit goes from 0 for no protection to 6 for maximum protection against solid bodies and dust, going from the largest to the finest solid bodies.The second number corresponds to protection against water with 0 for zero protection, 1 for simple protection against condensation and up to 8 for protection against permanent immersion.Thanks to these two figures, you will therefore know if your camera will be strong enough for the use you want to make of it.
