As the basis of the entire HD surveillance system, high-definition webcams have attracted much attention. In particular, high-definition camera products on the market have been dazzling, and even the technical concept of high-definition cameras has been widely discussed.
HD network cameras play a decisive role. We know that traditional SD monitoring is divided into analog, digital, and network types. The front end of the analog monitor is an analog camera, and the back end is a matrix. The digital surveillance front end is also an analog camera, and the back end is a DVR. There are two types of network monitoring front-ends, one is an analog camera + video encoder, one is a network camera, and the back end is a platform. In other words, in the era of SD surveillance, there are many types of analog cameras, network cameras, video encoders, and analog cameras at the front end.
Then why did the high-definition monitoring era, the front end must be high-definition network camera? There are two main reasons.
First, high-definition monitoring must be networked. It must be based on video compression processing and transmitted over an IP network. This is the only way to control the transmission costs of high-definition video.
Uncompressed high-definition video signals after the acquisition have both analog and digital transmission methods. Analog transmission generally uses YPbPr component transmission, and one HD video signal needs three coaxial cables to transmit at the same time. Digital transmission generally uses DVI, HDMI, or HD-SDI transmission. The transmission distance of DVI or HDMI is only a few meters, which is not suitable for monitoring and transmission. Although HD-SDI can transmit about 100 meters, it has high requirements for coaxial cables. Cable prices are also very expensive. Whether it is analog or digital transmission, the transmission cost of uncompressed high-definition video signals is significantly higher than that of analog SD video signals. With video compression coding and transmission over IP networks, the difference in transmission costs between high-definition video and standard-definition video is small.
Second, the efficiency and cost of front-end processing using a high-definition network camera directly is more advantageous than using a high-definition video encoder and a high-definition camera.
The current high-definition video sensor is mainly CMOS. The CMOS sensor directly outputs the digital video signal. In the camera, the digital high-definition video signal is directly compressed and encoded by the DSP or ASIC, and then transmitted in a networked manner, and the HD signal is output directly from the camera. It is economical and more efficient.
Development of HD Network Cameras for Market Applications Currently, self-built optical fiber networks or local area networks are used to implement 1000M bandwidth networks in projects such as safe cities and financial network monitoring. This kind of Gigabit bandwidth resources, installed in the front-end 100 Road 1080P full-real-time high-definition network cameras (even if calculated by each channel occupying resources 4Mbps), occupying less than 50% of the total bandwidth resources; if you use 720P transmission, the bandwidth can also be reduced by half. In this way, it can fully support the practical application of high-definition network cameras.
Although the market of domestic HD network cameras is at an initial stage, it is certainly the future trend. Currently, high-definition network cameras are mainly used in industries where there are special requirements for definition. With the improvement of high-definition network cameras and transmission equipment and the reduction of costs, more and more applications of HD network cameras and high-definition integrated solutions will be applied to security monitoring. . At the same time, high-definition network cameras with intelligent analysis will become new highlights.
The application of HD is based on networked video surveillance. Global survey data show that in recent years, the network monitoring market has grown at a rapid rate, while the market share of traditional analog surveillance products has remained stable. According to industry figures, the current network monitoring business has a limited share in China's overall security market. This is not only related to the immature development of China's surveillance market, but also to the fact that network monitoring has no “killer†technology compared to traditional analog products. Advantage. Therefore, only the development of high-definition technologies and solutions to the problems that limit their development can enable networked high-definition video surveillance to win the market. In fact, in the mature technology reserves and network infrastructure of IP cameras, there are no major obstacles in enhancing the clarity of technology and application, reflecting the pursuit of high-definition images.
HD network cameras play a decisive role. We know that traditional SD monitoring is divided into analog, digital, and network types. The front end of the analog monitor is an analog camera, and the back end is a matrix. The digital surveillance front end is also an analog camera, and the back end is a DVR. There are two types of network monitoring front-ends, one is an analog camera + video encoder, one is a network camera, and the back end is a platform. In other words, in the era of SD surveillance, there are many types of analog cameras, network cameras, video encoders, and analog cameras at the front end.
Then why did the high-definition monitoring era, the front end must be high-definition network camera? There are two main reasons.
First, high-definition monitoring must be networked. It must be based on video compression processing and transmitted over an IP network. This is the only way to control the transmission costs of high-definition video.
Uncompressed high-definition video signals after the acquisition have both analog and digital transmission methods. Analog transmission generally uses YPbPr component transmission, and one HD video signal needs three coaxial cables to transmit at the same time. Digital transmission generally uses DVI, HDMI, or HD-SDI transmission. The transmission distance of DVI or HDMI is only a few meters, which is not suitable for monitoring and transmission. Although HD-SDI can transmit about 100 meters, it has high requirements for coaxial cables. Cable prices are also very expensive. Whether it is analog or digital transmission, the transmission cost of uncompressed high-definition video signals is significantly higher than that of analog SD video signals. With video compression coding and transmission over IP networks, the difference in transmission costs between high-definition video and standard-definition video is small.
Second, the efficiency and cost of front-end processing using a high-definition network camera directly is more advantageous than using a high-definition video encoder and a high-definition camera.
The current high-definition video sensor is mainly CMOS. The CMOS sensor directly outputs the digital video signal. In the camera, the digital high-definition video signal is directly compressed and encoded by the DSP or ASIC, and then transmitted in a networked manner, and the HD signal is output directly from the camera. It is economical and more efficient.
Development of HD Network Cameras for Market Applications Currently, self-built optical fiber networks or local area networks are used to implement 1000M bandwidth networks in projects such as safe cities and financial network monitoring. This kind of Gigabit bandwidth resources, installed in the front-end 100 Road 1080P full-real-time high-definition network cameras (even if calculated by each channel occupying resources 4Mbps), occupying less than 50% of the total bandwidth resources; if you use 720P transmission, the bandwidth can also be reduced by half. In this way, it can fully support the practical application of high-definition network cameras.
Although the market of domestic HD network cameras is at an initial stage, it is certainly the future trend. Currently, high-definition network cameras are mainly used in industries where there are special requirements for definition. With the improvement of high-definition network cameras and transmission equipment and the reduction of costs, more and more applications of HD network cameras and high-definition integrated solutions will be applied to security monitoring. . At the same time, high-definition network cameras with intelligent analysis will become new highlights.
The application of HD is based on networked video surveillance. Global survey data show that in recent years, the network monitoring market has grown at a rapid rate, while the market share of traditional analog surveillance products has remained stable. According to industry figures, the current network monitoring business has a limited share in China's overall security market. This is not only related to the immature development of China's surveillance market, but also to the fact that network monitoring has no “killer†technology compared to traditional analog products. Advantage. Therefore, only the development of high-definition technologies and solutions to the problems that limit their development can enable networked high-definition video surveillance to win the market. In fact, in the mature technology reserves and network infrastructure of IP cameras, there are no major obstacles in enhancing the clarity of technology and application, reflecting the pursuit of high-definition images.
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