The IP camera transmits the video signal digitally, using the transport capabilities of the Ethernet network. In addition to the actual camera, consisting of a lens, optical filter, CCD-matrix, as well as electronic signal conversion and compression schemes, it is equipped with a network client, providing a standard connection with the receipt of a dedicated IP address.
The choice of a specific IP camera model is entirely determined by the intended conditions for its use.
WHAT TO LOOK FOR FIRST When You Are Buying Security Camera
Installation location IP cameras: at home or on the street?
One of the most important things when choosing an IP camera. Cameras for the street and for the premises differ constructively. If the camera is located at the point where direct sunlight is hit – the most effective method of preventing the CCD matrix from burnout is to install a lens with automatic adjustment of the aperture. In turn, the performance of this node depends on the external temperature, so the cameras in the street performance are equipped with a heating system. Internal installation devices are equipped with simpler lenses, and they are electronically adjusted.
Camera light sensitivity
This option is selected depending on the limits of the light change in the territory under control. For example, for the organization of video surveillance only in the daytime or in the presence of high-quality lighting, for a round-the-clock mode of operation enough equipment with sensitivity of about 0.1 suites. In general, IP cameras with CCD matrix are more expensive, but have a higher light sensitivity than with CMOS. At a minimum, you should focus on the CMOS ACS matrix, made with more advanced technology with less noise. In low light conditions, the sensitivity of the cameras that transmit color image is drastically reduced. A clearer and more contrasting picture can only be obtained from devices that work day/night mode. The best quality when there is a lack of lighting is given ip cameras with black and white video signal.
Among the most common formats in which modern network IP cameras are able to transmit an image are both purely computer-generated, with a 4:3 screen ratio (VGA, UXGA, zXGA) or 16:9 (HD, Full HD), and television standards (PAL). At the same time, a higher nominal resolution does not guarantee that the resulting picture will be clearer than from a matrix with a smaller total number of pixels. The reason for the blur may be a low-quality lens, an increase in interpolation permission, or software errors in digitization and compression.
The choice of the optimal standard depends on the purpose of the IP camera. If it is intended to be used for automatic facial recognition or car license plate detection, you should pay attention to devices with MJPEG compression. In all other cases, the H.264 compression method is preferable.
OTHER IMPORTANT FEATURES
- In low light conditions, infrared illumination will not be superfluous.
- The rotary mechanism and optical zoom (transfoator) will help to increase the coverage area.
- Even if the connection is lost, the cameras with the recording on Flash-drivewill not work idle.
- Do not depend on any problems with the network only cameras with Wi-Fimodule .
- PoE-powered devices don’t need to look for an outlet.
- Ip cameras with automatic return to normal performance after an emergency should be used to create a professional video surveillance system.
THE MOST POPULAR MANUFACTURERS OF IP CAMERAS
The most flattering reviews from professionals has the products of the well-known company SONY. A very wide range of IP cameras at AXIS,and in all price segments. Hikvision, Vivotek, Arecont Vision, Y-cam Solutions and many others are also well-respected.
SO THAT THE PURCHASE DOES NOT UPSET
When planning to organize video surveillance in low-light conditions, do not aim at cameras with color video – their sensitivity in the dark catastrophically falls.
When you purchase high-resolution IP cameras, make sure that the bandwidth and performance of the video server are sufficient to transmit the total flow and process it in real time.
Consider your climate area when buying equipment for installation on the street. At very low air temperature, the camera’s executive mechanisms work with increased load and quickly fail if they are not equipped with a heating system.