Network Video Surveillance Technology: APM+DSP Dual-Core Architecture The mainstream processing chips on the market today, including TI's DaVinci Series and Hass's 3510 series, all use the ARM+DSP dual-core architecture. In this architecture, ARM is the main control processor of the chip and is responsible for controlling the work of various modules of the chip and operating the operating system, network protocols, application software, etc.; the DSP system is mainly responsible for video and audio codec service processing, through the processor with video editing The decoding module completes the encoding and decoding of audio and video.
Network video server compression technology for network video surveillance technology: H.264 video compression algorithm H.264 is a joint video group of ITU-T's VCEG (Video Coding Experts Group) and ISO/IEC's MPEG (Moving Picture Coding Experts Group) ( JVT: jointvideoteam) developed a new digital video coding standard that is both part of ITU-T H.264 and part 10 of ISO/IEC MPEG-4. H.264 enables image compression technology to rise to a higher stage and provide high-quality transmission at a lower bandwidth. This advantage is very suitable for a large number of domestic operators and relatively limited access network/backbone bandwidth. With the same picture quality, H.264 saves an average of 64% of the transport stream compared to the previous-generation encoding standard MPEG-2, while MPEG-4 ASP saves an average of 39% of the transport stream. Drafting began in January 1998. In September 1999, the first draft was completed. In May 2001, its test model TML-8 was developed. In June 2002, the 5th meeting of JVT passed the H.264 FCD board. . March 2003 officially released.
Network video surveillance technology network video server compression algorithm: MPEG-4 video compression algorithm MPEG-4 focuses on solving the problem of low-bandwidth audio and video transmission, in the 164KHZ bandwidth, MPEG-4 can pass 5-7 frames on average /second. The network-based products using MPEG-4 compression technology can use networks with lower bandwidth, such as PSTN, ISDN, and ADSL, which greatly saves network costs. In addition, the highest resolution of MPEG-4 can reach 720×576, which is close to the effect of DVD picture. The mode based on image compression determines that it can ensure good clarity for moving objects. All these advantages of MPEG-4 make it one of the most important trends developed by current network product manufacturers.
Network video surveillance technology network video server compression algorithm: Flash video compression algorithm Flash advantage based on its cross-platform, versatility, based on the flash format of the Eshow video server without downloading any software or plug-in, just enter the IP address using a computer or Ordinary smartphones and 3G mobile phones can directly watch surveillance videos. It is convenient and safe. In addition, the flash format video adopts low bit rate transmission, and the occupied bandwidth is low. When the computer watches, only 0.5 K per frame, the mobile phone viewing takes only about 8 K, and the uploading speed reaches 14-20 frames/second, which is very fast and can support massive users. At the same time, the visit was smooth.
Network resources become the bottleneck of the relationship between the network environment and video information, just like the relationship between "road" and "car". To ensure smooth and safe operation of "vehicles", we must first make a good "road" construction. As China's current network application environment still has a variety of problems to be solved, the advantages of network-based product network cameras and network video servers cannot be fully realized, and the improvement and development of networks have become bottlenecks in product development.
Network Video Surveillance Technology: Dynamic IP Addresses Since network cameras and video servers have independent IP addresses, they can support multiple network protocols, such as TCP/IP, HTTP, ARP, UDP, etc., so video data is compressed and processed. The WEB server is sent to the end user via the LAN or INTERNET. As long as the user knows the IP address of a certain network camera and video server, the images monitored by this network camera and video server can be viewed.
Some network cameras, video servers and hard disk recorders on the market use fixed IP addresses. However, due to China's current unfavorable network application environment, especially for renting fixed IP addresses on the Internet, most networks are expensive. Most video cameras and video server products use dynamic IP addresses. That is, each time the network camera and video server log on to the Internet, the network will allocate a new IP address, just like ordinary PC dial-up Internet access, but this is also for remote users. The search for network cameras, video servers, and hard disk recorders has caused difficulties.
To solve this problem, there are different solutions under different network environments, in the intranet environment of LANs and WANs. The resources of the IP address are relatively sufficient. If not, NAT can be used, that is, using a different port of an IP address. In Internet, you can use the method of establishing a DDNS server on the network to solve the problem of dynamic IP addresses. That is, each network camera, video server and hard disk recorder has a network second-level domain name. This second-level domain name corresponds to the MAC address of the network camera, video server and hard disk recorder. As long as the network device is used on the network, it will automatically Connected to the DDNS, no matter how its IP address changes, as long as the customer enters the domain name in the IE address bar, you can use the DDNS server to connect the IP address of the network device with the remote client to achieve the purpose of domain name resolution.
Network Video Surveillance Technology: Network Security For industries such as security, which have special requirements for security, the confidentiality of audio and video information in network transmission is a problem that cannot be ignored, especially in the current situation where the network is more vulnerable. Safeguarding the secure transmission of information has become one of the technical difficulties that need to be solved in the further promotion and application of network monitoring.
The manufacturer of network equipment adopts the LINUX system in the operating system of the CPU core. This is because the LINUX system itself occupies a small capacity and is easy to be embedded in the equipment. In addition, LINUX is an open operating system and adopts LINUX. After that, users can improve their security mechanisms according to their own needs. In addition, the built-in firewall, multiple authorizations, and password authentication are also commonly used protection measures. The on-demand access mechanism of network devices also reduces the problems caused by broadcast methods.
Of course, most of the currently used protection measures are aimed at terminal operations. To truly ensure the security of network transmission, in addition to enhancing security measures at the device side, it also depends on the improvement of the overall network environment quality.
Network disconnection, plugged network disconnection, and congestion are also common network problems. In order to avoid data loss caused by this, some manufacturers have built-in alarm image buffers in their products. When the network is briefly disconnected or blocked, buffering occurs. The district can temporarily store part of the on-site image data to ensure that important data is not lost. For particularly important places, this can be solved by using both front and back-end video recording. Some manufacturers also choose special routers for IP cameras, video servers, and hard disk recordings. They can automatically dial up the Internet in the event of a disconnection and keep the network open at all times.
In addition, some manufacturers have installed hard disks inside the network cameras so that the camera can still maintain video and store data in time when the network is blocked or disconnected. After the network is connected, the data is sent to the remote site. The method will also increase the cost of the product and cause maintenance problems.
Network video surveillance technology: In addition to LAN, INTERNET and other commonly used networks, in recent years, the combination of network cameras, video servers, hard disk recorders and wireless networks has also become a promotion of network-based products has played a catalytic role.
This Article Tags: Network Video Surveillance
Network video server compression technology for network video surveillance technology: H.264 video compression algorithm H.264 is a joint video group of ITU-T's VCEG (Video Coding Experts Group) and ISO/IEC's MPEG (Moving Picture Coding Experts Group) ( JVT: jointvideoteam) developed a new digital video coding standard that is both part of ITU-T H.264 and part 10 of ISO/IEC MPEG-4. H.264 enables image compression technology to rise to a higher stage and provide high-quality transmission at a lower bandwidth. This advantage is very suitable for a large number of domestic operators and relatively limited access network/backbone bandwidth. With the same picture quality, H.264 saves an average of 64% of the transport stream compared to the previous-generation encoding standard MPEG-2, while MPEG-4 ASP saves an average of 39% of the transport stream. Drafting began in January 1998. In September 1999, the first draft was completed. In May 2001, its test model TML-8 was developed. In June 2002, the 5th meeting of JVT passed the H.264 FCD board. . March 2003 officially released.
Network video surveillance technology network video server compression algorithm: MPEG-4 video compression algorithm MPEG-4 focuses on solving the problem of low-bandwidth audio and video transmission, in the 164KHZ bandwidth, MPEG-4 can pass 5-7 frames on average /second. The network-based products using MPEG-4 compression technology can use networks with lower bandwidth, such as PSTN, ISDN, and ADSL, which greatly saves network costs. In addition, the highest resolution of MPEG-4 can reach 720×576, which is close to the effect of DVD picture. The mode based on image compression determines that it can ensure good clarity for moving objects. All these advantages of MPEG-4 make it one of the most important trends developed by current network product manufacturers.
Network video surveillance technology network video server compression algorithm: Flash video compression algorithm Flash advantage based on its cross-platform, versatility, based on the flash format of the Eshow video server without downloading any software or plug-in, just enter the IP address using a computer or Ordinary smartphones and 3G mobile phones can directly watch surveillance videos. It is convenient and safe. In addition, the flash format video adopts low bit rate transmission, and the occupied bandwidth is low. When the computer watches, only 0.5 K per frame, the mobile phone viewing takes only about 8 K, and the uploading speed reaches 14-20 frames/second, which is very fast and can support massive users. At the same time, the visit was smooth.
Network resources become the bottleneck of the relationship between the network environment and video information, just like the relationship between "road" and "car". To ensure smooth and safe operation of "vehicles", we must first make a good "road" construction. As China's current network application environment still has a variety of problems to be solved, the advantages of network-based product network cameras and network video servers cannot be fully realized, and the improvement and development of networks have become bottlenecks in product development.
Network Video Surveillance Technology: Dynamic IP Addresses Since network cameras and video servers have independent IP addresses, they can support multiple network protocols, such as TCP/IP, HTTP, ARP, UDP, etc., so video data is compressed and processed. The WEB server is sent to the end user via the LAN or INTERNET. As long as the user knows the IP address of a certain network camera and video server, the images monitored by this network camera and video server can be viewed.
Some network cameras, video servers and hard disk recorders on the market use fixed IP addresses. However, due to China's current unfavorable network application environment, especially for renting fixed IP addresses on the Internet, most networks are expensive. Most video cameras and video server products use dynamic IP addresses. That is, each time the network camera and video server log on to the Internet, the network will allocate a new IP address, just like ordinary PC dial-up Internet access, but this is also for remote users. The search for network cameras, video servers, and hard disk recorders has caused difficulties.
To solve this problem, there are different solutions under different network environments, in the intranet environment of LANs and WANs. The resources of the IP address are relatively sufficient. If not, NAT can be used, that is, using a different port of an IP address. In Internet, you can use the method of establishing a DDNS server on the network to solve the problem of dynamic IP addresses. That is, each network camera, video server and hard disk recorder has a network second-level domain name. This second-level domain name corresponds to the MAC address of the network camera, video server and hard disk recorder. As long as the network device is used on the network, it will automatically Connected to the DDNS, no matter how its IP address changes, as long as the customer enters the domain name in the IE address bar, you can use the DDNS server to connect the IP address of the network device with the remote client to achieve the purpose of domain name resolution.
Network Video Surveillance Technology: Network Security For industries such as security, which have special requirements for security, the confidentiality of audio and video information in network transmission is a problem that cannot be ignored, especially in the current situation where the network is more vulnerable. Safeguarding the secure transmission of information has become one of the technical difficulties that need to be solved in the further promotion and application of network monitoring.
The manufacturer of network equipment adopts the LINUX system in the operating system of the CPU core. This is because the LINUX system itself occupies a small capacity and is easy to be embedded in the equipment. In addition, LINUX is an open operating system and adopts LINUX. After that, users can improve their security mechanisms according to their own needs. In addition, the built-in firewall, multiple authorizations, and password authentication are also commonly used protection measures. The on-demand access mechanism of network devices also reduces the problems caused by broadcast methods.
Of course, most of the currently used protection measures are aimed at terminal operations. To truly ensure the security of network transmission, in addition to enhancing security measures at the device side, it also depends on the improvement of the overall network environment quality.
Network disconnection, plugged network disconnection, and congestion are also common network problems. In order to avoid data loss caused by this, some manufacturers have built-in alarm image buffers in their products. When the network is briefly disconnected or blocked, buffering occurs. The district can temporarily store part of the on-site image data to ensure that important data is not lost. For particularly important places, this can be solved by using both front and back-end video recording. Some manufacturers also choose special routers for IP cameras, video servers, and hard disk recordings. They can automatically dial up the Internet in the event of a disconnection and keep the network open at all times.
In addition, some manufacturers have installed hard disks inside the network cameras so that the camera can still maintain video and store data in time when the network is blocked or disconnected. After the network is connected, the data is sent to the remote site. The method will also increase the cost of the product and cause maintenance problems.
Network video surveillance technology: In addition to LAN, INTERNET and other commonly used networks, in recent years, the combination of network cameras, video servers, hard disk recorders and wireless networks has also become a promotion of network-based products has played a catalytic role.
This Article Tags: Network Video Surveillance
Auto Lock Steel Measuring Tape
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