The rapid application and popularization of high-definition surveillance not only requires the front-end high-definition equipment manufacturers to provide serialized mature high-definition products, but also builds a flexible and diversified product selection for high-definition monitoring systems. The overall monitoring effect of high-definition solutions and the cost-effectiveness of popular applications are also crucial factors.
With the continuous launch of high-definition surveillance products and pilot applications, and the continuous improvement and maturity of HD products and solutions, the high-definition picture quality and high-quality monitoring results of high-definition products have gradually been highly recognized by the market, which will accelerate the promotion of monitoring. The system transitioned from standard definition to high-definition, and the accelerated monitoring model was transformed from the analog + DVR model to the high-definition IPC application model.
The prerequisite for high-definition surveillance applications is networking
The first thing to consider after acquiring HD pictures is the transmission of video signals. High-definition video places higher requirements on transmission.
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.
Therefore, it can be seen that high-definition monitoring must first be based on video compression processing and transmitted over the IP network. Only in this way can we effectively control the transmission cost of high-definition video, so that the high-definition monitoring really has practical significance.
The choice of network transmission method
High-definition video can select or construct an appropriate network transmission method according to the network conditions and application scenarios of the system, including network architecture selection (LAN/WAN), transmission mode selection (cable/wireless), and transmission media selection (network cable/optical fiber).
With the maturation and application of wireless and wired broadband technologies such as TD-LTE, Wi-Fi, and private networks, the long-distance transmission of large-volume data is more convenient, which also eliminates the transmission barriers of high-definition network cameras in a wide range of applications.
At present, self-built optical fiber networks or local area networks are usually 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.
Using TD-LTE technology as a quasi-4G mainstream communication technology makes wireless high-definition video transmission possible. TD-LTE (Long Term Evolution) is a technology that has a core independent intellectual property in China and is widely supported internationally. It is a wireless communication standard designed for mobile high-bandwidth applications. According to the definition of TR25.913 of 3GPP, the peak rate of LTE is required to be high, with an uplink of 50 Mbps and a downlink of 100 Mbps.
At the Shanghai World Expo, the TD-LTE demonstration network constructed by China Mobile covered 5.28 square kilometers of the Expo Park. A total of 17 outdoor TD-LTE stations were built, and indoor coverage of 9 venues was achieved, including 7 venues in Pudong, Puxi. Venues. The demonstration services such as mobile high-definition conferencing, mobile high-definition video surveillance, mobile high-definition video on-demand transmission, and portable video transmission based on the TD-LTE demonstration network were all open to the public and achieved good results.
to sum up
Not only to see, but also to see clearly, with the wide application of video surveillance, people have higher and higher requirements for video clarity. However, only high-definition video capture can not achieve the purpose of high-definition monitoring. The transmission of high-definition video is also a matter of concern. The networked transmission mode and the application of the latest communication technology are the necessary conditions for achieving high-definition monitoring.
With the continuous launch of high-definition surveillance products and pilot applications, and the continuous improvement and maturity of HD products and solutions, the high-definition picture quality and high-quality monitoring results of high-definition products have gradually been highly recognized by the market, which will accelerate the promotion of monitoring. The system transitioned from standard definition to high-definition, and the accelerated monitoring model was transformed from the analog + DVR model to the high-definition IPC application model.
The prerequisite for high-definition surveillance applications is networking
The first thing to consider after acquiring HD pictures is the transmission of video signals. High-definition video places higher requirements on transmission.
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.
Therefore, it can be seen that high-definition monitoring must first be based on video compression processing and transmitted over the IP network. Only in this way can we effectively control the transmission cost of high-definition video, so that the high-definition monitoring really has practical significance.
The choice of network transmission method
High-definition video can select or construct an appropriate network transmission method according to the network conditions and application scenarios of the system, including network architecture selection (LAN/WAN), transmission mode selection (cable/wireless), and transmission media selection (network cable/optical fiber).
With the maturation and application of wireless and wired broadband technologies such as TD-LTE, Wi-Fi, and private networks, the long-distance transmission of large-volume data is more convenient, which also eliminates the transmission barriers of high-definition network cameras in a wide range of applications.
At present, self-built optical fiber networks or local area networks are usually 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.
Using TD-LTE technology as a quasi-4G mainstream communication technology makes wireless high-definition video transmission possible. TD-LTE (Long Term Evolution) is a technology that has a core independent intellectual property in China and is widely supported internationally. It is a wireless communication standard designed for mobile high-bandwidth applications. According to the definition of TR25.913 of 3GPP, the peak rate of LTE is required to be high, with an uplink of 50 Mbps and a downlink of 100 Mbps.
At the Shanghai World Expo, the TD-LTE demonstration network constructed by China Mobile covered 5.28 square kilometers of the Expo Park. A total of 17 outdoor TD-LTE stations were built, and indoor coverage of 9 venues was achieved, including 7 venues in Pudong, Puxi. Venues. The demonstration services such as mobile high-definition conferencing, mobile high-definition video surveillance, mobile high-definition video on-demand transmission, and portable video transmission based on the TD-LTE demonstration network were all open to the public and achieved good results.
to sum up
Not only to see, but also to see clearly, with the wide application of video surveillance, people have higher and higher requirements for video clarity. However, only high-definition video capture can not achieve the purpose of high-definition monitoring. The transmission of high-definition video is also a matter of concern. The networked transmission mode and the application of the latest communication technology are the necessary conditions for achieving high-definition monitoring.
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