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How to buy video network server

    

At present, in the area of surveillance video images, digital, network, intelligence has become a development trend, digital video monitoring system have gradually entered the stage of large-scale commercial application. And the first generation of traditional analog video surveillance systems, digital video monitoring system has undergone two stages of development: the late 1990s, using computer multimedia technology to achieve a digital video monitoring, known as the second generation of quasi - Local digital video surveillance system, a typical product is the digital hard drive recorders (DVR); early 21st century, a web-based to digital video processing technology as the core, comprehensive utilization of photoelectric sensor, digital image processing, embedded computer systems , Data transmission networks, automatic control and artificial intelligence technologies, such as a new digital monitoring system was born, it not only has the local first-generation digital monitoring system with a fast computer processing power, digital information anti-interference capabilities, to facilitate quick search records , Clear and single video image shows the advantages of multiple images, and relying on networks, broadband networks played a real advantage, through the IP network, the monitoring centre and a network can reach any part of the monitoring system as a combination of objective, real adaptation The current video surveillance system for remote, real-time, on demand, and this is the third generation digital remote video surveillance system, a typical product is the network video server.
 Although, with the traditional analog control systems, based on the number of DVR-digital video surveillance system is not less than the local first leap, in this not a repeat.
 Network video server products although the market does not like the hard drive digital video recorder market, as varied, mixed status, but the actual quality, performance difference is quite large. Therefore, customers include Security Contractors should consider the specific application environments in particular, the network environment, and the following product standards, performance indicators, improve the function of the weigh to make the purchase decision.

Whether a product with relevant qualifications
 Product quality is not fully representative of the quality and performance, but many systems integration projects is the basic condition for acceptance, but also whether a product qualified the basic conditions.

The background of product management software intellectual property protection
 Whenever network video server products, there must be matching the background monitoring and management software. As the OEM market on a large number of counterfeit products and illegal products, so that customers can't do anything. Hardware devices can be modeled, the software can also copy. And the original manufacturers in order to prevent illegal copies of software, often set traps in the software, but users have become the innocent victims.
 Therefore, products supporting the background monitor whether there are intellectual property management software that customers will be an important criterion for judging one of the products.

Send a standard real-time images of the actual activities of bandwidth demand
 This is a measure of overall performance network video server one of the key indicators. High-bandwidth Internet mean that the cost of increased use of end-users, this will shake their use of digital monitoring mode of determination, after all, the economy of any enterprise units have had to consider the issue.
 As different image status (static, normal activities, high-speed Movement), image resolution, send images , its occupation of network bandwidth very different, so many network video server manufacturer in the recommended products, always trying to Fuzzy this A target. In this regard, we can set up a more unified image of the state, that is, the normal activities of image, image resolution of 352 * 288, frame to 25 / s case, all the way video image occupied by the network bandwidth. As far as we know, including Taiwan, South Korea is part of the manufacturers of products in the bandwidth requirements of between 500-600 K, and some even require 800-900 K.


Frequency of the transmission delay
 Although, transmission delay on any network video servers are inevitable, but different network video server delay different values. Delay level will directly affect the value of digital monitoring results. Just imagine, when the monitoring control centre in front of the camera through the mouse control PTZ, in five seconds, five mouse clicks, and in 10 seconds after seeing the display on the first click on the PTZ control Effect, what would it 
 As different frame rates ranging from under the transmission delay (the same product, the higher the frame rate, the lower the transmission delay), for the unity of comparison, the conditions set 25 / sec circumstances.

The video features pre-trigger alarm
 On the market a variety of network video server in the video features are very comprehensive, real-time video, video timing, the police video, video alarm trigger can be divided into mobile video, video manually triggered, the outside world sensors (such as infrared detectors) trigger Videos.
 However, such as manual trigger alarm, basically ended after the accident before the start, the video also records the alarm is triggered only after the image. After the events of track, its records are incomplete.
 At present, there are a few of the network video server manufacturers already have triggered alarm pre-video features, trigger alarm can save a few seconds to tens of seconds before the image signal, this feature for users of the police after the incident tracking judgement is of special significance.

Electronic map function
 For large network monitoring systems, as more and decentralized control point, the client in the monitoring and management on a lot of inconvenience, the electronic map function will greatly simplify the user's operating functions.
 Network video server management software with the electronic map function, independent monitoring system configuration diagram point, the image of the way through the diagram depicting control point to the distribution system structure, project monitoring system, more cases of the features of the visual display monitor Point distribution of information, and through the matrix directly click to select video surveillance points on the image can watch real-time monitoring, greatly facilitate the user's control.

IE monitoring
 Regular monitoring and management software for the realization of the functional integrity, operation tedious inconvenience, or even require specialized training and study to master.
 Management software to provide the appropriate leadership in management or professional monitoring the use of a simple version of the WEB monitoring and management software options, IE can single-page form of the monitor screen images, video, control, users do not need to install software, in Monitoring, choice of images do not have to enter a different memory of the complex network video server IP address, just visit the WEB server to download the pre-control point configuration information such as name of control, mouse click to select the image name can be achieved monitoring.

Multi-channel video server network transmission of images of frame
 Currently on the market network video server can support all the way or two-way or four-way video input. As channel support of the image, the more the product of technical and performance requirements higher, so the majority of products for one-way or "quasi-multi-channel" products.
 What we are talking about the real multi-channel video server network to support each output 25 / s digital video images, is the real "real-time." And "quasi-multi-channel" products regardless of two or four-way road, the output of digital video image of the total resources for frame 25 / s, that is, multi-channel sharing 25 / s, in image processing technology and one-way Almost no difference between products. This is price discrimination can be simple, some manufacturers of single and two-way price difference of only a few hundred dollars, basically can be judged both on their products as "two-way products."

Standard image compression algorithm
 The current mainstream network video server compression algorithm is nothing more than standard MJPEG, MPEG-1, MPEG-4 three.
 MJPEG compression technology from the standard JPEG picture compression technology, is a simple intra-JPEG compression, image compression better clarity. However, since this way their own technical limitations, can not make the compression ratio, the higher volume of data, video per hour 1-2 G space, network transmission cost a lot of bandwidth resources, do not apply to moving objects image compression, not much Apply to domestic long video security needs.
 MPEG-1 compression technology standard multi-frame by frame before and after the compression algorithm predicted, and it is very compressed flexibility, most widely used, this algorithm technology developed, data compression rate MJPEG higher, but still larger volume of data , 300-400 M per hour video space, if for a long time real-time video Bank, occupying more space on your hard drive, especially the larger network transmission occupied bandwidth, not practical in the long-range video transmission.
 MPEG-4 compression standard is now entered a practical stage of the most advanced compression technology, which uses a very narrow bandwidth, through the frame reconstruction compression and transmission of images, at least to the data in order to get the best image quality. MPEG-4 features to make it more suitable for AV services and interactive remote monitoring using MPEG-4 compression algorithms, image compression, video per hour 100-200 M space, high-definition images, occupied bandwidth on the network transmission, through All kinds of video transmission for remote video transmission.

Monitoring Center can monitor, video channel.
 As video surveillance network for multiple servers and more decentralized network of long-distance, real-time, centralized monitoring, therefore, control centre can monitor, video video channel is a measure of long-range focus on monitoring the effect of key indicators.
 At the same time, in theory, can monitor an unlimited number of remote sites image real-time monitoring, video. However, in practical application by the Centre for Monitoring the actual network bandwidth limitations, such as the Center for the network bandwidth of 10 M, assuming each video occupy 250 K, can achieve a maximum of 40 video films, unless the cost of each and every video bandwidth or increasing network bandwidth.

How to effectively support multiple users simultaneous access with a front-end monitoring
 Web-based video server in the large-scale video network centralized monitoring system, the monitoring centre is usually set up a number of monitoring the client, often the same time of the visit of a certain front-end monitoring network and the issue of real-time monitoring or video calls requesting the situation. When the monitoring center of N monitoring client needs while watching a monitor at a remote image (assuming all the way images bandwidth occupied for 250 K), conventional mode of network bandwidth for the occupation (N * 250) K, often leads to plug the data Impact monitoring results, the conventional network video server system can only support three or four client's request to visit at the same time.

Whether to support the local online video remote intelligent information retrieval, playback and transcription
 For a number of scattered points in the distance, real-time, centralized monitoring system application, the current network bandwidth of the scarcity of resources and paid, out of economic considerations, most users will use ADSL broadband lines for remote digital video signals in the Transmission. At present the telecommunications sector of the monthly ADSL lines to provide bandwidth for the theoretical value of upstream bandwidth 512 K, down 2 M, but the reality is often only the upstream bandwidth over 200 K. In order to fully meet the demand for monitoring applications, the actual system in the use of "real-time remote centres round of monitoring visits, the local real-time video outlets, the Centre for Remote at any time to see the video" features models.
 The local video outlets for long-range look at the application, the majority of network video server software still can not provide an effective solution, most local outlets by the staff select the video file and remote copy, or E-MAIL to the monitoring centre staff , The monitoring centre staff to receive further open the watch, tedious time-consuming operation.

The availability of electronic map function
 In large-scale video surveillance system, since the surveillance network, widely distributed, the status of the various monitoring points complex information (as some point set to alarm linked video feature, part of the video, set to feature regularly, and some point set up real-time video capabilities  , Etc.), monitoring the work of the Centre in selective monitoring, video, feature set when the operation will face complicated problems. Electronic map function can provide system-wide distribution of network monitoring, visual diagram can be displayed on the monitor and control the distribution of points at early warning, the police interaction, such as state information, users can diagram on the basis of the need for independent monitoring targeted at the function, and Fast video images from surveillance points.

Whether to support the dynamic IP network environment of the automatic link
 Based on the ADSL broadband lines in the network application environment, telecommunications companies to provide access to the user's IP access is a dynamic way, that is, dial-up users through virtual technology dynamic IP address to access the Internet: computer users through the installation of local dial-up procedure , Driving ADSL Modem dial-up access, INTERNET, ISP usually users will be randomly assigned to a public IP address, in the break before this IP address is the only other users can access the IP address of the user, but once the break When connected again, ISP will re-allocation of another random IP addresses to the user.
 In the use of network video server on remote video monitoring applications, in line based on ADSL broadband network applications, how easy to achieve in a dynamic IP address to the monitoring center under the conditions of the front of the monitor real-time access, is still plagued many projects to , System integrators and network video server manufacturer one of the problems. At present, many network video server can not provide dynamic IP access solution, once the project or the use of Internet users through the video server and ADSL to set up remote monitoring system, is likely to result in system can not achieve the desired functions.


The availability of ADSL automatic dialing
 Conventional ADSL broadband applications must be adopted and ADSL Modem connected to the computer-driven dial-up Internet. However, if only the ADSL access for remote monitoring purposes, then to a simple dial-up ADSL and specialized functions in front of a monitor configuration on a computer, users will undoubtedly cause a great waste of resources equipment. In these circumstances, the availability of ADSL automatic dial-up users will directly affect the function of the investment budget.

It can monitor system and other management systems to integrate
 In some applications circumstances, the video surveillance system is only one of the major systems of subsystems, if able to video surveillance systems and other systems for organic integration, will greatly facilitate the user's operating system.

Warranty issues
 The question is warranty work to one of the issues of greatest concern. As the project to directly face the end-users, unsatisfactory warranty service will directly affect the project's reputation. Therefore, I will present the company products a year free warranty.

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