Analogovoto video surveillance e is known as CCTV have a (closed-circuit television). Kartinata se indulging on coaxial cable, svrzvasch Camerata and zapisvaschoto device. Standard, kartinata is izobrazyava to monitor svrzan ss zapisvascho device.
The resolution of analog CCTV cameras is measured in horizontal TV lines-standard 480 TVL, 540 TVL, 700 TVL, 800 TVL, 900 TVL 1000 TVL. Diversity other parameters is large, dome, shoulder, plastic or metal, with fixed or varifocal lens, with or without infrared illumination.
In analog video surveillance system VCR-the DVR (can e respectively 4-, 8-, 16- and 32-channel) device is important and without it the user may not have direct access to individual cameras.
After receiving the analog video signal from the cameras, DVR-and converts the analog signal into a digital, compressed, and then stored compressed video on hard disks. Moreover, DVR has different recording modes, including full-time, schedule, motion detection and alarm. DVR-A can connect to the network through the RJ45 interface.
When spread on the internet, video on all cameras is transmitted as a stream (an IP address). Therefore, it is very efficient. Analog products are the budgetary decision to build video surveillance systems, but the technology is almost obsolete.
IP camera for video surveillance
IP (Internet Protocol) camera provides high quality images with megapixel resolution 1.0 MP, 2.0 MP, 3.0 MP, 5.0 MP, 6.0 MP, 8.0 MP and has a built-in processor, image sensor and an IR filter that helps you capture clean images with true color reproduction.
The IP camera has a motion detector that allows the user to inform about suspicious activity observed areas. By combining this with the complex recording modes and the possibility to notify a message or email you will receive a vigilant guard who looks after the security of your home or business around the clock.
Authorized users can access IP camera from anywhere in the world via the Internet, watch live video or recorded footage via computer, smartphone or tablet. Standard IP camera includes a power cord and an Ethernet (RJ45) port, some multifunctional cameras have a richer interface, including audio input / output, alarm input / output slot for Micro-SD card or BNC output. Before installation it is very important to choose the right IP camera as the installation environment:
- Shoulder camera-allows monitoring from a greater distance;
• Dome camera-compact size and aesthetic design that makes it easy to blend in with your decor;
• Camera Fisheye / panoramic view-provides a panoramic view of your area of 180 ° or 360 °;
• Plastic-for internal use or metal-Vandal;
• fixed or varifocal lens-crucial to the view angle of the camera and thus the size of the observed area;
• the PTZ dome camera-ideal for monitoring large area, the user is able to monitor and focus on details.
Unlike analog systems, IP cameras alone captures images instantly converts them into a digital signal, compress them with H.264 format, and then transmits them over the network. With regard to image quality – IP camera provides a much higher picture quality and crystal clear images with higher resolution.
The network video recorder-NVR serves to record video and manage IP cameras, the main difference is that the videos are digital and NVR-and not to compress the video