The security of residential residential security is the current development trend. Because the residential residential monitoring system is very sensitive to cost, using wireless technology can save more than 90% of the cost compared with the wired solution. This paper will discuss the scheme and analysis of wireless Mesh technology for building security intelligence in residential communities.
Compared to traditional analog video surveillance networks, today's IP network video surveillance systems provide a powerful solution that provides greater flexibility, reliability and further reduced deployment costs. In the past, wireless video surveillance was considered a point-to-point solution with poor reliability. Wireless Mesh networks have changed this perception as more and more users implement video surveillance on Strix wireless Mesh networks. Coverage distances and ranges that were considered impossible in the past few years have been achieved through the robust high performance, low latency and multi-hop scalability of wireless Mesh networks.
From a global perspective, the video surveillance market can reach more than tens of billions of dollars. According to iSuppli Corporation, video surveillance equipment will reach $12 billion by 2011, including video surveillance cameras, DVRs and video servers. "It is expected that in 2015-2016, the network-based monitoring system will be a comprehensive alternative to analog monitoring systems." IMS Research pointed out that by the end of 2009, "analog video equipment will only have a 5% market share."
With the expansion of existing network deployments and the development of new network digital monitoring systems, the development of the IP video surveillance market has also been well established. With the transformation of DVR digital video recording to NVR (network video recording) technology, the development of IP technology application in the video surveillance market is also rapidly spreading. In addition, IP video surveillance technology will also expand the video surveillance market, covering more new applications and new market segments. Wireless Mesh network technology has also become a new direction in the video surveillance market.
The Strix Wireless Mesh Network facilitates large-scale distributed video surveillance deployments, providing the industry's highest throughput, lowest latency, unmatched flexibility and reliability for IP video surveillance systems. Strix wireless Mesh networks are widely deployed worldwide, especially when users require wireless network performance comparable to wired networks or for critical surveillance systems. Strix Access/OneTM is the industry's only wireless network architecture that has been validated by independent lab testing and actual global deployment.
Traditional deployments use coaxial cables, expensive fiber optic multiplexer distribution amplifiers, and even proprietary twist-pair solutions similar to Ethernet cables. The situation is rapidly changing, eliminating many deployment barriers by eliminating cable limitations. Extra cost, it is possible to realize the monitoring system in the past; as long as the coverage of the wireless Mesh network architecture, the video surveillance head and the video server can be placed arbitrarily, so more users find the advantages of the solution and gradually replace the traditional Analog video surveillance system.
Distributed video surveillance network helps community security intelligent system construction
Strix wireless Mesh network enables large-scale deployment and strategic IP video surveillance, especially for government, municipal, public safety or corporate security, video surveillance is a key application system; also suitable for price-sensitive residential communities Intelligent system.
Distributed video surveillance provides powerful ability to view, share, and distribute video, and works with statistics and integration information like access control systems or intrusion detection systems, eliminating the hassle of centralized server farms and single points of failure. Strix offers a fully distributed wireless Mesh video surveillance system that includes video cameras, video servers, storage clusters, client applications and remote viewing.
In addition, network video surveillance cooperates with applications such as remote alarm systems, which further improves the efficiency of the security department and reduces the response cost of false alarms. According to statistics, for most government and enterprise units, this function is reduced by 90%. Alarm rate.
Advantages of IP video surveillance
* Scalable deployment based on user needs
* Take advantage of wireless and other architectures to leverage existing IP network equipment
*Working with other security systems and interoperability with other network devices
* Optimize video streaming to reduce storage space, traditional video compression technology requires more storage space
* Use wireless technology to distribute video to multiple locations, reducing time and labor costs
* Improve security coverage and improve video transmission quality
*Handheld terminal can view video surveillance information at any time and any place
* Installation is faster and easier, easy to upgrade and migrate
Solution evaluation
In order to make the most accurate network assessment, several factors are critical, including video compression algorithms, camera count, video server location, and remote viewing location.
Don't be confused with NTSC and PAL in analog monitoring. The VGA standard defines the resolution of IP video surveillance. The video compression algorithm determines the video quality, image size, and number of turns, together with the image update technology determines the bandwidth requirements for video surveillance. The bandwidth of video surveillance can range from a few hundred K to several megabits per second, with a maximum of 30 turns per second.
Video compression method
A normal analog video stream that is uncompressed can consume up to 165 Mb/s of bandwidth, while a megapixel IP camera can consume as much bandwidth as a few Gigabytes. Therefore, video compression hormones must be used in order to reduce image size and preserve more bandwidth.
The degree of compression affects the quality of the RF monitoring, causing the video to be uncleaned or distorted, so balance the size of the compressed video image with the clarity of the video. In general, IP video surveillance heads and video server manufacturers have reached this balance, and the standards that manufacturers can adopt have long been established.
At present, there are various compression methods, mainly including H.264, MPEG4 and MJPEG; they can be divided into two types, namely, compression coding mode and dynamic coding mode.
When considering video compression methods, MJPEG is the most widely used compression technique, and it is completely compressed for each video frame. This technology allows predictable video requirements, but at the same time, MJPEG bandwidth efficiency is not high, especially in the case of leaf movement.
H.263, H.264, and MPEG4 technologies are gaining popularity and are widely used in video deployments where bandwidth is slightly lower and image quality is slightly lower. The key to dynamic compression is that all of the back pillows are not fully compressed, and that changes are compressed and transmitted. Therefore, the advantage of this technology is that it only sends the changed parts outside the key ,, which can save 50-80% of the bandwidth. Strix Access/One adds performance benefits and increases network scalability.
IP video surveillance camera
Current IP cameras not only improve traditional technologies but also add network interfaces, and have made great strides in adopting new analog conversion technologies. In the past few years, CMOS technology has facilitated digital-to-analog conversion of low-cost IP video transmission. Progressive scanning better shows moving objects, while analog cameras produce interlaced scanning problems at 4CIF resolution, causing blurred objects. Analog video images are composed of lines, and each image is formed by progressive scanning. When the image contains many moving objects, the image becomes blurred at progressive scanning.
The advanced technology of IP video surveillance digital pixel image sampling surpasses the traditional analog CCD technology. With digital pixel image technology, one image can be acquired at once, providing clear images even at high altitudes. The latest pixel image sampling technology supports low brightness and special lighting conditions, fully realizing all the functions of CCD technology. Embedded intelligence algorithms include built-in dynamic discovery, automatic compression selection, bandwidth and network optimization control, and video delivery decision-making processes. The new generation of video cameras includes a programmable API interface and DSP that can be accessed directly or through the programming interface of the NVR.
In this way, the PTZ camera can be programmed to recognize the object, zoom in to obtain a high resolution image and then trigger an alarm, phone or email to the security personnel. In addition, by entering megapixel imaging technology, IP cameras can surpass the industry's traditional NTSC/PAL high resolution solutions. Compared to today's digital/analog cameras (the more the 400,000 pixels), the megapixel camera can provide images from 1 million to 5 megapixels, enabling higher pixel levels in the future.
New bandwidth optimization technologies, such as æ¡¢ rate control technology, have become built-in features, while traditional analog cameras always send all video. The network rate monitoring technology of network video surveillance means that the IP camera/video server only sends video with a certain number of turns, no unnecessary video is transmitted on the network, and the IP video camera/video server can be configured to increase the number of turns after finding the moving target. , or send different numbers of turns for different recipients, etc. These features are very suitable for remote locations where bandwidth is not high.
Another important development work is the VMD (Variable Motion Discovery) technology. VMD is an integrated feature of IP cameras and NVRs that offers many advantages over DVRs. As a built-in function of the IP camera or video server, the VMD reduces the load on the recording device and makes event-based video surveillance possible. No motion is sent to the operator or video equipment when no motion occurs in the field of view. VMD data about activity information can be included in the video stream to simplify finding activity in storage. VMD can also be located in video management software to provide this functionality for IP cameras that do not have VMD capabilities.
The advantages of the local VMD function of the IP camera and video server include: saving bandwidth, reducing the CPU load of the recording device, saving storage space, and the camera can cooperate with other systems through input/output ports (for example, triggering an alarm).
Based on the above dynamic characteristics, it is very difficult to estimate the bandwidth required by the monitoring system. Therefore, the following table lists the general reference basis for calculating the bandwidth based on the resolution. Thus, the bandwidth requirement can be determined by simply calculating the size of the image and multiplying by the number of turns per second.
Network video recorder
The network video recorder is the main component of the distributed video surveillance system and can be located anywhere in the network. The NVR has all the features of today's DVR, but the essential difference is that the NVR is a fully digital system and is designed for IP video transmission. . NVR allows managers to access, view and control video cameras from anywhere on the network.
NVR is basically a software solution that helps end users make hardware decisions, including servers, storage, encoders and decoders, and cameras. NVRs can support traditional analog and IP video cameras from multiple vendors, including advanced megapixel cameras, and most offer advanced programmable interface APIs for control and custom function development.
The NVR system is a complete digital IP video surveillance system that integrates matrix controllers, switches, control boards and DVRs with storage capabilities into the same system. As a software-based enterprise and video, voice and data management system, NVR provides graphical user interface, monitoring, recording and analysis capabilities to provide managers with timely and accurate information.
The NVR is the best choice for multi-site monitoring, providing a distributed monitoring system and centralized control of remote installation and offline storage recording. In the network video surveillance environment, the NVR provides video and video management functions.
The NVR is selected based on the required performance, usually using the number of turns per second as an indicator. If each camera requires 30 frames per second, a server may only be able to record for 25 cameras. If 2 sec per second is sufficient, then one server can manage 300 cameras. This means that system performance is fully utilized and optimized.
For large deployments, IP network video systems are the easiest to scale. When the system needs to support high video recording rate or longer video splashing, it can be done by adding processor capacity and memory to the network video server. Or the easier way is to join another NVR device, either at the central site or at the remote site.
The IP video surveillance camera performs the encoding function, or the analog camera can cooperate with an independent encoding/decoding device. The NVR can be placed anywhere in the network, and the physical independence of the encoding device simplifies management and improves usability, and the NVR does not need Contribute system processing power for managing video cards or compression. NVR provides video stream management and video storage management. It should not be overlooked that storage management is also a very important factor to meet the storage requirements of users for 24-hour recording. NVRs can clip stored video to dynamic or other criteria, further reducing day-to-day maintenance and potentially reducing the need for video storage capacity.
Today, governments and enterprises maintain multiple independent servers for remote DVRs. When using any NVR deployed in the network, centralized management of remote database video becomes simpler, and remote databases can be replicated to the central security room. Separating video surveillance functions also helps provide productivity. While maintaining the servers of other mission-critical systems, the IT department can take responsibility for maintaining video surveillance servers and storage, ensuring that edge video devices can be connected to the network stably. The server can also Regular maintenance provides the ability to continuously monitor network assets.
In addition, the IT component provides reasonable access to resources based on security policies so that security personnel can focus on security incidents rather than maintaining storage devices. As a result, not only the repetitive device investment is reduced for network transmission and video access, but also organizational roles and responsibilities are optimized. Utilizing the fully distributed capabilities of the NVR, it is well suited to work with wireless Mesh networks, further reducing initial equipment deployment costs and operational costs after use.
Strix high-performance Mesh architecture significantly reduces the intelligent cost of residential communities
Strix Access/One multimode products are built for high performance and flexibility. Strix's patented multimode approach includes standards-based 2.4GHz 802.11b/g, 5GHz 802.11a and high-power 4.9GHz Dsrc-C for public safety networks, providing the industry's first "arbitrary module, arbitrary service and arbitrary Configuration "Flexibility support.
Strix Access/One uses the powerful and stable Strix Dynamic Mesh Architecture (DMA) to implement Strix High Performance Mesh Algorithm (HPMA) and Scalable Mesh Fast Re-route. , SMFR). Strix DMA solves the problems of other Mesh algorithms. SMFR provides automatic self-organizing, self-healing and unrelated topology fast routing, supports mobile roaming under high-speed mobile, and near zero bandwidth loss after multi-hop.
Strix Access/One's industry's most cost-effective wireless Mesh platform delivers three times the total cost per square kilometer (TCO) of other systems, supporting a fiber node with 100 wireless Mesh nodes and a capacity of 10 square kilometers , greatly reducing site coordination time, cost and complexity, speeding up time to market, and helping to achieve the industry's lowest total cost of ownership.
The industry's only modular system: delivering the highest capacity, highest throughput and lowest latency for voice, data and video applications. Strix OWS outdoor wireless Mesh nodes support field upgrades, up to 6 wireless modules, and support a wide range of antenna options; up to 4 wireless modules can be used for customer access, greatly improving indoor penetration (using sector antennas) And increase user density by a factor of three. In addition, the introduction of new technologies, such as WiMAX, is easier to implement through field upgrades.
The Strix platform has more than 100 metropolitan deployments around the world and has been validated by Iometrix's independent labs. The system is proven to be mature and stable. These tests show that Strix is ​​the best performing wireless Mesh network platform in the industry. 35Mb/s high throughput. In addition, the mobile switching time at 300 km/h is less than 50 ms, making high-speed movements like railway deployment possible.
The zero-configuration capability of the platform scales to meet wireless Mesh network deployments at the city or even at the national level. Simple to manage, Strix provides a graphical management interface and command line commands to quickly get the system working status. The product provides hardware-accelerated AES encryption, protects communication between wireless nodes, and uses WPA for terminal access security.
Distributed video surveillance system is an important means of residential community security. Strix distributed wireless monitoring network brings great value to similar deployments.
To reduce bandwidth consumption, smart camera and bandwidth optimization features reduce the size and speed of image transmission while also taking into account the bandwidth and latency of remote viewing and PTZ functions. Depending on the camera used, the PTZ control delay is generally less than 250ms, and in the analog configuration, the encoding/decoding process will be 150-200ms. The remote viewing application will also consume a portion of the video transmission bandwidth due to monitoring with the video server. Although the administrator can directly access the camera. Each manufacturer's remote viewing technology allows users to choose to view the number of video surveillance cameras, camera grouping, resolution, parameters and PZT control.
In order to fully address the bandwidth issue, further discussion of devices such as video compression, IP cameras, and network video servers is needed.
Strix wireless Mesh network provides the same performance and flexibility as wired network, which is very suitable for video surveillance in residential areas, and can be intelligently coordinated with community security such as alarm, access control and border system.
Rapid deployment method
1) Power the Mesh node and camera
Install Strix Mesh nodes indoors or outdoors
Each node Mesh supports multiple video cameras, connects Mesh nodes through network cables, and supports solar power supply outdoors.
2) Determine that the wireless Mesh network requires at least a few fiber locations.
Determine the number and location of cameras and calculate the required bandwidth
First determine the camera position, video monitoring center device location, and then determine the Mesh node location
In large deployments, the maximum bandwidth of the camera must be considered and the overall bandwidth calculated
For redundancy purposes, it is necessary to add a certain number of fiber drop locations and wireless Mesh nodes.
3) Implement VLAN on the path between the video camera and the NVR/DVR, implement QoS guarantee to the high throughput and low latency of the central node, and use the Strix high-performance wireless backhaul link for traffic relay when there is a blind zone
4) After power-on, the Strix Access/One node will automatically form a wireless mesh network to complete the network networking work.
In summary, the multi-mode Mesh solution not only brings performance improvements, but also has a far-reaching impact on the intelligent construction of residential areas due to the cost-effectiveness of metro Mesh networks.
references:
[1]. VGA datasheet http://
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