Depending on the features of video signal processing and transmission, there are two types of video surveillance camera systems – HD analog surveillance camera and IP surveillance camera. Recently, HD analog systems have become a lot more popular due to their reliability and ease of use.
The main difference between IP surveillance camera and HD analog surveillance cameras is the data transfer format. The video stream of IP surveillance camera devices is broadcast in digital format and complies with generally accepted network protocols. This provides fast processing and secondary data conversion.
Within an analog video surveillance camera system, there are three video decoding technologies – AHD, HD-CVI and HD-TVI. The first technology is based on the transmission of sound and images over standard cables without delays and loss of clarity over a distance of more than 500 meters.
HD-CVI technology is distinguished by construction on the basis of separation of luminance and chrominance signals while maintaining high image quality.
The third technology, HD-TVI, is a new standard for analog video surveillance, which provides images with a resolution of 1920×1080 pixels and higher. The developer is Techpoint and mostly used by the largest video surveillance manufacturer in the world – Hikvision. It is based on the technology of separation of color signals, as well as preprocessing of an unmodulated video signal.
Let’s consider the advantages and disadvantages of each type of video surveillance camera system.
Analog systems: pros and cons
Analog video surveillance cameras are simple image-to-video converters without any processing. The principle of the camera is the penetration of light onto the lens and matrix, which converts it into a video signal. Video signal transmission is performed using a coaxial cable to the DVR for its further digitization.
Analog video surveillance
The main advantages of analog devices are low cost, interoperability between equipment from different manufacturers, ease of setup and use. Among the shortcomings are functional limitations (lack of motion sensors and support for audio signals), complex scaling and reorganization of the entire system, as well as the lack of remote access via the Internet.
Analog video surveillance camera systems will be the best option for installation in small areas – homes, offices, beauty salons, entrances of apartment buildings, warehouses and other facilities.
IP video surveillance camera systems: advantages and disadvantages
Digital video cameras allow you to receive process and digitize a video signal. The main feature of digital equipment is that each camera has its own individual IP address.
The main disadvantage is the high cost of IP video surveillance systems.