Blocking the popularity of HD market equipment

Security monitoring is an inevitable trend toward the HD, but it involves the entire system, any link does not meet the high-definition requirements, will form a system bottleneck, so that the overall quality of the system down, the effect of high-definition to reflect the overall solution. Because in the video signal encoding and compression, video signal transmission and video file playback process, if it fails to meet the high-definition standard, the back-end image display will inevitably be greatly reduced.

The HD-SDI protocol-based digital high-definition system consists of an HD-SDI camera, an HD-SDI optical transceiver, an HD-SDI matrix, an HD-SDI encoder, or a DVR. The sales of HD-SDI camera products are still relatively small. The reason may be that their market recognition is still relatively limited. At the same time, HD-SDI still has problems with uncompressed huge amount of data storage and transmission distance. It is expected that there will be short-term problems. The market application of HD-SDI will not have a big breakthrough. It is its advantage to meet the high-definition monitoring while meeting the original application habits, but the two systems for display and storage need to be built separately, and the openness and expansion capabilities are relatively poor. High transmission link cost requirements and short transmission distance are its shortcomings.

IP high-definition monitoring situation is better, at this stage of the IP million HD) transmission can already be pressed between 2-3Mbps, and 1080P can also be compressed under 6Mbps bandwidth flow control, which can be said for IP high-definition transmission and storage burden Greatly reduced. However, compared with the transmission of conventional monitoring equipment, the current basic 720P specification calculates that the code stream is about twice as large as D1 and the bandwidth is about 3M. In 1080P calculation, the code stream is 5 times more than D1, and the bandwidth used is about 6M, the same holds true for the storage capacity of the hard disk. As the investment in high-definition camera equipment has increased exponentially compared with CIF and D1 cameras in the past, other ancillary products have also become more expensive, especially for storage equipment.

At present, most of the relevant policies for promoting video surveillance equipment throughout the country require clarity above D1. High-definition applications mainly rely on the promotion of large-scale government-related projects. Local governments are under pressure from land finance, and the funds are very tight. Government funding or government-based funding, the need to implement monitoring projects (such as safe city, intelligent transportation, safe campus, Pingan Hospital, etc.), the amount of money required is very large, but can only minimize the deployment of high-definition cameras. With the construction of safe cities deeper into the third and fourth tier cities, the funding problem may be even greater. The same is true for users who must install video surveillance equipment. The lack of acquisition funds and operating costs is the biggest obstacle to the popularity of high-definition video surveillance equipment.

There are few on-duty personnel, and it is impossible to focus on such a large number of video images for a long time and continuously, and then the clear images are only rushed past, and the security status of the protection target cannot be judged by the real-time images. Only talking about "system equipment can be achieved", does not consider "operators can do", in essence, can not achieve the user's required system goals, which is one of the key issues of the current technical protection projects. Intelligently judging the security status is the urgent and practical requirement at present, and it is the key to improving the effectiveness of project prevention. High-definition is the technical problem that needs to be solved in the process of intelligent application. If high-definition cannot produce effective effects for creating practical smart functions, that is, the actual effect of high-definition on solving security problems cannot be seen, and the relationship of “dependency and interaction” between high-definition and intelligence cannot be seen, and users cannot “spend” it. "Big money" invests in technology venture capital for high-definition products.

The investigation of the insufficiency of the application of high-definition network cameras reflects that real-time and high-definition display problems, the difficulty of integration due to non-standard agreements, and the lack of uniform format standards reflect the most. The main reason for signal delay on real-time display is that high-definition products occupy higher bandwidth requirements, IP video signal packets have higher packet loss ratios, and bandwidth delays cause delays. Currently, network transmission costs in China are relatively expensive. In consideration of the cost, 15 FPS transmissions are considered to cause video streaming problems. In the case of non-standard protocols, the coding methods of various manufacturers are different, resulting in compatibility problems in the back-end decoding. Part of the private protocol SDK standards are not uniform, difficult to integrate, and difficult to integrate; the standard is Another problem that needs to be solved. The national standard “Technical Requirements for Information Transmission, Exchange, and Control of Security Surveillance Video Surveillance Networked Systems” that was implemented on June 1, 2012, ie, the GB/T28181-2011 standard can solve the basic problem of integration of high-definition video and existing systems, but it It's just a standard that basically allows video surveillance to interoperate within a wide range. Video delays caused by network transmission, network dropped frames, insecure video data, and mass storage of data make some users discourage. Therefore, high-definition network only fully solve the network delay, mass storage, and the combination of intelligent analysis and other issues in order to get better development.

The progress with mobile HD surveillance can explain the problem. Although the bandwidth of 3G is much higher than that of 2G and 2.5G, the bandwidth of 3G bears the task of transmission in both uplink and downlink directions, and a base station may have multiple users working at the same time, and the speed of terminal movement will also affect. Transmission speed (3G can support transmission speeds of approximately 2M/s, 384K/s, and 144K/s, respectively, in indoor, outdoor, and driving environments), resulting in uncertainty in the bandwidth of wireless transmissions. Even the current 3G networks transmit CIFs. Image, a base station can not exceed 3 monitoring points. The 3G operator's customer priority is transmitted in the order of the voice customer, the priority customer, and the ordinary data customer, and the transmission of the ordinary mobile monitoring user is also unstable. The current 3G network speed can only be used as an auxiliary transmission means of monitoring. The operating costs of the mobile monitoring system include broadband Internet access fees for video sources, mobile phone viewing traffic charges, and monitoring system operating costs. In the 3G network environment, high-definition monitoring cannot be promoted at all. Even China Mobile's 4G network test data shows that the average downlink downlink speed reaches 40Mbps, and the average uplink speed is 18Mbps. Due to the same reasons as mentioned above for 3G systems, it is still very difficult to promote HD.