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.
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.
From a market perspective, users of urban security surveillance, transportation, airports, and finance industries have an urgent need for high-definition video images, and users who are concerned about the cost of construction investment are psychologically prepared. Users are not concerned about funding issues. It is whether the HD system provided by the manufacturer can meet the user's expectations.
First, the development of new network technologies provides bandwidth guarantee for megapixel HD transmission:
Safe cities, financial network monitoring and other projects use self-built optical network or local area network to achieve 1000M bandwidth network. This Gigabit bandwidth resource is installed in the front-end of the above-mentioned 200 720P megapixel full-real-time HD cameras (occupying 3Mbps per channel), occupying 60%-80% of the total bandwidth resources (200 channels of 720P may not appear in actual projects. At the same time decoding on the wall, involving the cost of decoding on the wall, more than 50% to 100% of the points in the CIF format decoding on the wall or 1/5 to 1/3 points to decode the wall), so Gigabit network is fully effective support . In the application of high-definition network projects, many megapixel HD cameras are installed at key area monitoring points, and other monitoring points are based on the standard H. 264 compression algorithm FullD1 standard definition network camera or traditional analog + encoder mode access. Such as bank vaults, important traffic intersections and bays or gates, accidents or frequent occurrence of cases can be equipped with megapixel HD cameras, so that key events, on-site situations in key locations have HD images can be adjusted.
The adoption of a megapixel high-definition and standard definition hybrid networking method not only saves equipment costs, but also effectively saves network bandwidth resources. Both the practicality and economy of the system can be perfectly combined to fully satisfy the cost-effectiveness requirements of users. (Note: The actual stable bandwidth of a Gigabit fiber is about 400M. If it is too high, such as 500M, 600M will easily lead to network failure. The actual bandwidth of the above-mentioned 200-channel 720P to the back-end core switch can reach 650M-800M. Gigabit network can actually carry 2-10 Gigabits to a core switch and the actual project is not likely to have a 200 Gb 720P with only one Gigabit fiber, and it is impossible for engineers and engineers to design such a transmission. If the above 200 channels are converted to 1080P and the video bandwidth is calculated by 5M or even a high standard of 6M each, the bandwidth design of the entire transmission network almost needs to be doubled, and the cost is almost doubled, which is why the market is now The 1080P can be called loudly, but in the actual project, only the public security monitoring class invested by the government, especially the illegal use of the road, has captured the biggest reason that the project with profitability is widely used.
As for public network transmission, megapixel HD network cameras support dual-stream technology, such as supporting 1080P+720P+D1+CIF full-real-time dual stream, so that they can use 720P/1080P HD applications locally, and use D1+CIF for remote users to call remotely. In other words, although the current ADSL wide area network technology can not support large-scale megapixel HD network cameras, it can meet the different needs of local and remote users through dual-stream technology.
Second, the development of mass storage technology makes storage no longer a bottleneck for megapixel HD applications:
As described before, based on the standard H. 264 compression technology, high-definition network camera, all the way 720P HD full real-time image stream is 3Mbps, video storage space required for an hour is about 1.35G or so (if 1080P, video recording is usually calculated according to 5Mbps, one hour requires 2.25G); Often, users often ask: A megapixel camera needs such a large storage space, how many megapixels? In fact, a megapixel HD camera can replace many ordinary cameras. With high-resolution image quality, the storage of videos will become more valuable (policy-based surveillance systems, and 90% of the final results are based on high-definition video playback).
Network storage systems (including storage servers and storage devices) are required for high definition image recording of high definition network cameras. The main connection methods of storage servers and storage devices are DAS direct connection, NAS network hard disk, and SAN (FC SAN and IP SAN) storage area networks. IP SAN uses IP architecture for Ethernet transmission and has good scalability and sharing. And lower application costs for allocation are one of the major technologies currently used for large and medium-sized centralized monitoring and storage. On the other hand, the mainstream data hard disk capacity used in IT has been terabytes or more, and the price of 2TB data hard disks has been popularized (calculated at an hourly data volume of 1.35G, a 1TB (actually available about 920G) data hard disk can store approximately 720P. 680 hours of video images or 1 hour of video recorded by 680 cameras).
Third, the LCD monitor has become the new favorite of high-definition video surveillance:
The high-definition surveillance industry does not have its own standards, so currently the major HD network camera manufacturers are all referring to the HDTV HDTV technology standards. There are two internationally recognized standards for HD: the video vertical resolution is 720p or 1080i; the video aspect ratio is 16:9. In the past few years, driven by the consumer electronics market, coupled with the shift of CRT TVs to liquid crystal and plasma TV screens, HDTV has achieved great success. Currently, the mainstream LCD monitors on the market are 21.5′′ and 24′′ with a resolution of 1920×1080. They can be compatible with point-to-point 720p and 1080p full HD video displays in the 16:9 format. The mainstream size of LCD TVs is 42′′, which is also the standard display size of 1080P HD. These LCD monitors and LCD TVs have high-definition interfaces such as YPbPr and HDMI, which meet the requirements of high-definition network camera video display. Some mainstream manufacturers' panels can reach 5ms or even higher 2ms, which is enough to meet the image refresh requirements of 25fps ~ 30fps.
Fortunately, security HD LCD monitors also followed closely and achieved rapid development. Some LCDs based on DID technology have the advantages of ultra-lightweight, low power consumption, high contrast, no flicker, low cost, etc., and have promoted its application in the field of security monitoring, especially in the video walls of command centers of some large-scale projects. use. This shows that there is no bottleneck in the display of high-definition video surveillance.
Fourth, the standard H. 264 compression technology to enhance video management center platform compatibility:
Most of the current monitoring platform systems in the domestic surveillance market are based on the traditional DVR and NVS (or DVS) infrastructure. Many people think that these platforms need to spend a huge amount of overhead to be compatible with megapixel image management. In fact, HD or not only imposes higher requirements on data volume and image decoding capability, but also affects front-end codec devices, network bandwidth, and storage devices. In a sense, the platform's ability to support high-definition is related to the architecture of the platform. The better the system architecture is, the lower the cost of accessing new products will be. In addition, some IP camera manufacturers can also provide high-definition video surveillance management platform.
At this stage, the mainstream compression technology is the standard H. 264 compression algorithm, using this algorithm not only has good picture quality, but also has a low code stream, and more importantly, standard H. The 264-format video files can be decoded and played using standard decoders (such as Storm Video, VLC, MPC, KMPlayer, etc.), and the versatility and compatibility of devices are greatly improved. In a sense, it can be said that the standard H. 264 solves the problem of video data file compatibility that plagues the entire security community.
For the HD video image decoding capability that users generally care about, the current dual-core PC can basically decode 4 channels of 720P (30fps, 3Mbps stream) or 1 channel of 1080P (30fps, 6Mbps stream). Currently, there are already 1080P, 720P, and FullD1 fully compatible hardware decoders provided by mainstream IP camera manufacturers, enabling high-definition video decoding output controlled by the management center platform. In addition, the latest technology of mainstream IP camera manufacturers can already use video card hardware decoding core to complete multi-channel high-definition real-time video decoding display on a PC.
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.
From a market perspective, users of urban security surveillance, transportation, airports, and finance industries have an urgent need for high-definition video images, and users who are concerned about the cost of construction investment are psychologically prepared. Users are not concerned about funding issues. It is whether the HD system provided by the manufacturer can meet the user's expectations.
First, the development of new network technologies provides bandwidth guarantee for megapixel HD transmission:
Safe cities, financial network monitoring and other projects use self-built optical network or local area network to achieve 1000M bandwidth network. This Gigabit bandwidth resource is installed in the front-end of the above-mentioned 200 720P megapixel full-real-time HD cameras (occupying 3Mbps per channel), occupying 60%-80% of the total bandwidth resources (200 channels of 720P may not appear in actual projects. At the same time decoding on the wall, involving the cost of decoding on the wall, more than 50% to 100% of the points in the CIF format decoding on the wall or 1/5 to 1/3 points to decode the wall), so Gigabit network is fully effective support . In the application of high-definition network projects, many megapixel HD cameras are installed at key area monitoring points, and other monitoring points are based on the standard H. 264 compression algorithm FullD1 standard definition network camera or traditional analog + encoder mode access. Such as bank vaults, important traffic intersections and bays or gates, accidents or frequent occurrence of cases can be equipped with megapixel HD cameras, so that key events, on-site situations in key locations have HD images can be adjusted.
The adoption of a megapixel high-definition and standard definition hybrid networking method not only saves equipment costs, but also effectively saves network bandwidth resources. Both the practicality and economy of the system can be perfectly combined to fully satisfy the cost-effectiveness requirements of users. (Note: The actual stable bandwidth of a Gigabit fiber is about 400M. If it is too high, such as 500M, 600M will easily lead to network failure. The actual bandwidth of the above-mentioned 200-channel 720P to the back-end core switch can reach 650M-800M. Gigabit network can actually carry 2-10 Gigabits to a core switch and the actual project is not likely to have a 200 Gb 720P with only one Gigabit fiber, and it is impossible for engineers and engineers to design such a transmission. If the above 200 channels are converted to 1080P and the video bandwidth is calculated by 5M or even a high standard of 6M each, the bandwidth design of the entire transmission network almost needs to be doubled, and the cost is almost doubled, which is why the market is now The 1080P can be called loudly, but in the actual project, only the public security monitoring class invested by the government, especially the illegal use of the road, has captured the biggest reason that the project with profitability is widely used.
As for public network transmission, megapixel HD network cameras support dual-stream technology, such as supporting 1080P+720P+D1+CIF full-real-time dual stream, so that they can use 720P/1080P HD applications locally, and use D1+CIF for remote users to call remotely. In other words, although the current ADSL wide area network technology can not support large-scale megapixel HD network cameras, it can meet the different needs of local and remote users through dual-stream technology.
Second, the development of mass storage technology makes storage no longer a bottleneck for megapixel HD applications:
As described before, based on the standard H. 264 compression technology, high-definition network camera, all the way 720P HD full real-time image stream is 3Mbps, video storage space required for an hour is about 1.35G or so (if 1080P, video recording is usually calculated according to 5Mbps, one hour requires 2.25G); Often, users often ask: A megapixel camera needs such a large storage space, how many megapixels? In fact, a megapixel HD camera can replace many ordinary cameras. With high-resolution image quality, the storage of videos will become more valuable (policy-based surveillance systems, and 90% of the final results are based on high-definition video playback).
Network storage systems (including storage servers and storage devices) are required for high definition image recording of high definition network cameras. The main connection methods of storage servers and storage devices are DAS direct connection, NAS network hard disk, and SAN (FC SAN and IP SAN) storage area networks. IP SAN uses IP architecture for Ethernet transmission and has good scalability and sharing. And lower application costs for allocation are one of the major technologies currently used for large and medium-sized centralized monitoring and storage. On the other hand, the mainstream data hard disk capacity used in IT has been terabytes or more, and the price of 2TB data hard disks has been popularized (calculated at an hourly data volume of 1.35G, a 1TB (actually available about 920G) data hard disk can store approximately 720P. 680 hours of video images or 1 hour of video recorded by 680 cameras).
Third, the LCD monitor has become the new favorite of high-definition video surveillance:
The high-definition surveillance industry does not have its own standards, so currently the major HD network camera manufacturers are all referring to the HDTV HDTV technology standards. There are two internationally recognized standards for HD: the video vertical resolution is 720p or 1080i; the video aspect ratio is 16:9. In the past few years, driven by the consumer electronics market, coupled with the shift of CRT TVs to liquid crystal and plasma TV screens, HDTV has achieved great success. Currently, the mainstream LCD monitors on the market are 21.5′′ and 24′′ with a resolution of 1920×1080. They can be compatible with point-to-point 720p and 1080p full HD video displays in the 16:9 format. The mainstream size of LCD TVs is 42′′, which is also the standard display size of 1080P HD. These LCD monitors and LCD TVs have high-definition interfaces such as YPbPr and HDMI, which meet the requirements of high-definition network camera video display. Some mainstream manufacturers' panels can reach 5ms or even higher 2ms, which is enough to meet the image refresh requirements of 25fps ~ 30fps.
Fortunately, security HD LCD monitors also followed closely and achieved rapid development. Some LCDs based on DID technology have the advantages of ultra-lightweight, low power consumption, high contrast, no flicker, low cost, etc., and have promoted its application in the field of security monitoring, especially in the video walls of command centers of some large-scale projects. use. This shows that there is no bottleneck in the display of high-definition video surveillance.
Fourth, the standard H. 264 compression technology to enhance video management center platform compatibility:
Most of the current monitoring platform systems in the domestic surveillance market are based on the traditional DVR and NVS (or DVS) infrastructure. Many people think that these platforms need to spend a huge amount of overhead to be compatible with megapixel image management. In fact, HD or not only imposes higher requirements on data volume and image decoding capability, but also affects front-end codec devices, network bandwidth, and storage devices. In a sense, the platform's ability to support high-definition is related to the architecture of the platform. The better the system architecture is, the lower the cost of accessing new products will be. In addition, some IP camera manufacturers can also provide high-definition video surveillance management platform.
At this stage, the mainstream compression technology is the standard H. 264 compression algorithm, using this algorithm not only has good picture quality, but also has a low code stream, and more importantly, standard H. The 264-format video files can be decoded and played using standard decoders (such as Storm Video, VLC, MPC, KMPlayer, etc.), and the versatility and compatibility of devices are greatly improved. In a sense, it can be said that the standard H. 264 solves the problem of video data file compatibility that plagues the entire security community.
For the HD video image decoding capability that users generally care about, the current dual-core PC can basically decode 4 channels of 720P (30fps, 3Mbps stream) or 1 channel of 1080P (30fps, 6Mbps stream). Currently, there are already 1080P, 720P, and FullD1 fully compatible hardware decoders provided by mainstream IP camera manufacturers, enabling high-definition video decoding output controlled by the management center platform. In addition, the latest technology of mainstream IP camera manufacturers can already use video card hardware decoding core to complete multi-channel high-definition real-time video decoding display on a PC.
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