For the implementation of outdoor video surveillance, conventional cameras for indoor installation without a protective case are not suitable. For outdoor installation, it is necessary to use cameras that have a good degree of protection from the adverse effects of the environment. As a rule, such cameras are marked with a special designation of the กล้องวงจรปิด ราคา type “IP66”, which means a high degree of protection against penetration, exposure to moisture and dust. Let’s take a closer look at all the main features of outdoor security cameras, and talk about the main criteria for their selection.
Differences in outdoor surveillance cameras
The main distinguishing feature of CCTV cameras designed for outdoor installation is the presence of a special thermal housing that protects the device from precipitation, as well as from exposure to high and low temperatures.
When choosing such cameras, it is necessary to pay attention to the following characteristics:
- Degree of protection IP – thanks to these figures you can find out what conditions of use the camera is designed for
- Operating temperature range – you need to buy the device that corresponds to the lowest and highest temperatures characteristic of your area
- The presence of a heating element allows you to use the camera in conditions of extremely low temperatures;
- Minimum illumination – in order for the camera to monitor what is happening both day and night, you need to purchase a device with good sensitivity, for example, to shoot at night, the device should have min. illumination is 0.003-0.1 Lux, with moonlight illumination – 0.3-0.05 Lux. In general, the higher the sensitivity of the camera, the better.
Dome cameras are often used for outdoor installation due to the design features of these devices, it is almost impossible to pull the camera out of the installation site, and the risk of damage to the device with solid objects is reduced, provided that the camera has a tamper-resistant glass case.
Another point when choosing cameras for outdoor video surveillance is the presence of automatic adjustment of aperture and wide dynamic range. Due to frequent changes in illumination even in the daytime, the camera should be able to automatically change the aperture values and thus adjust to the current illumination in order to avoid the appearance of frame highlights, as well as a dark image. A wide dynamic range helps well in the presence of an uneven distribution of illumination across the frame, for example, in direct sunlight. With WDR, the probability of occurrence of illuminated and darkened places in the frame is significantly reduced, and the whole image looks uniform in terms of illumination level.
When shooting at night, the camera should be able to automatically switch to black and white mode, because in monochrome at night the sensitivity of the matrix increases and the amount of digital noise is reduced, and the image looks better than in colour. Today, most cameras have a similar model, but still, just in case, check this point with the seller upon purchase.