First of all, compared with the traditional analog monitoring system, which is very mature in technology, its networking and debugging are relatively unfamiliar to the engineering personnel who are familiar with the simulation system. As we all know, network cameras rely on the existence of the network, and the condition of the network itself is closely related to the application effect of network cameras. Looking at the impact of the basic network environment on the application, if the network monitoring system is based on an established network, whether the existing network infrastructure can meet the monitoring requirements is a consideration; however, for a network monitoring system based on a new network, There will be relatively large investments in building a new network environment, and large investments may make it difficult for users to afford. In addition, the network camera's visit will be plagued by domain names, IP addresses and other issues, and network security issues are also the focus of the user's attention, so the combined effect of many issues have restricted the wide application of network cameras. However, in terms of network security, today's millions of high-definition network cameras have built-in internationally-standardized VPN protocols that can seamlessly connect with network security devices and can be securely connected to internal LANs through the Internet, thereby greatly improving audio and video. Security can prevent intrusion into the internal network through the network camera's network cable. In addition, generally, high-definition network cameras also have built-in UPNP protocol, plug and play, no need to change the settings of network security devices such as firewalls, also reduces the difficulty of debugging.
Secondly, some SD network cameras do not have the same image quality as analog surveillance cameras, and the network cameras have some brains and other non-real-time features that have also boosted the use of analog surveillance cameras in large-scale deployments and have firmly dominated the surveillance market. status. However, with the improvement of technology and the improvement of user requirements, high definition has become the target pursued by security companies. 720P/1080P high-definition surveillance cameras are increasingly favored by users. Taking some mainstream manufacturers as an example, the entire series of millions of high-definition surveillance cameras launched last year are all compliant with the H.264 algorithm standard and can achieve 1920Ã—1080, 1600Ã—1200, 1280Ã—720 full-real-time, million HD, and support 1600Ã—1200. Video multi-stream video output, can easily achieve high-definition monitoring, can capture the details of the image in true and clear, the picture quality than the traditional D1 increased by 4 times, so that the application of high-definition surveillance cameras are also widely seen, you can optimistically predict Under the trend of high-definition and networked video surveillance, high-definition network surveillance cameras will show a rapid development trend.
Finally, the cost of webcams is still high. Compared with analog surveillance cameras, because the network camera market is not yet mature, its high prices make it prohibitive for many industry users. With the gradual mastery of the surveillance camera core technology and the large-scale application of domestic compressed chips, many domestic security companies have launched a wide variety of network cameras. Some manufacturers also have a full range of high-definition network cameras that can provide users with a richer choice. This means that the price will inevitably have a substantial downward adjustment. The current price of high-definition network surveillance cameras has increasingly approached the traditional analog surveillance cameras, so that more users can use the network cameras.
Development Trends of HD Network Camera Technology Network cameras have gradually been accepted by the people after several years of development. Compared with analog cameras, they support higher-definition picture monitoring and have the convenience of remote control of real-time browsing. The following are hardware, Software and other aspects of the analysis of the future development of network cameras.
â—‡ Image Sensor In the development of image sensor technology for network cameras, technical specifications have experienced technical improvements in D1 (400,000 pixels), 720P (1.3 million pixels), and 1080P (2 million pixels). Obviously, high definition has become mainstream and demanding. In the future, 3 million, 5 million or even more than 10 million pixels of high-definition network cameras will continue to enter the video surveillance project applications. People will never stop on the road to pursue more clearly.
In the image sensor hardware, CMOS is continuously occupying the market share of CCD. In the era of high-definition network cameras, CMOS has become a mainstream sensor. At the same time, CMOS is also continuously improved in technology, sensitivity, exposure time, low illumination, wide dynamic applications, CMOS advantage relative to CCD becomes increasingly obvious. CMOS sensors respond faster than CCDs, and are therefore more suitable for high-volume data quality monitoring. With the shrinking of the pixel size and the reduction of power consumption, video cameras based on miniaturized and low-power CMOS image sensors will become the mainstream of consumer products.
The competition in the coding chip and algorithm coding chip market has been fierce, and domestic applications are mostly TI (Haikang, Dahua) and Hass (Tiandi Albert, Huanghe Digital), others such as Anba, Shengmai, NXP, Trident, etc. There are few applications such as tactics. Hass new Hi3518 chip, applied to high-definition network cameras, image quality has greatly improved, more cost-effective. The chip manufacturers are also constantly improving technology, such as integrating ISP, optimization algorithms, etc., to enhance video stability and introduce more cost-effective products.
In compression algorithms, H.264 is currently the mainstream. However, as the resolution of video continues to increase, the pressure on bandwidth and storage is increasing. The H.265 algorithm is a representative of new technologies. Improve compression efficiency, reduce latency, and more. H.265 aims to transmit higher-quality network video with limited bandwidth and only needs the original half bandwidth to play the same quality video. The 720P picture quality can be transmitted using a transmission rate of 1-2 Mbps. This also means that mobile devices such as smartphones and tablets will be able to play 1080P full HD video directly online. The H.265 standard also supports 4K (4096Ã—2160) and 8K (8192Ã—4320) Ultra HD video. The H.265 standard allows online video to follow the "high resolution" display. The application of the H.265 algorithm will bring a new revolution to video surveillance manufacturers.
â—‡Compatible with standardized international standards such as ONVIF, PSIA, etc. Committed to promoting the application of network video in the security market through global open interface standards. These interface standards ensure network video products (web cams, NVRs, monitoring platforms, etc.) produced by different manufacturers. ) with interoperability. In the Chinese market has been more and more companies recognized. The promulgation of the national standard GB/T28181-2011 put forward more rational requirements for compatible standardization. In the next few years, standardization will become the passport for HD network cameras to reach the market.
â—‡ 4G wireless transmission 4G refers to the fourth-generation mobile communication technology. It is a technology that integrates 3G and WLAN and can transmit high-quality video images. From GSM, GPRS to 3G to 4G, technology continues to evolve and improve. The 4G system is capable of downloading at a speed of 100 Mbps, is 50 times faster than the 3G (WCDMA) Internet speed, and can upload speeds up to 20 Mbps, and can satisfy almost any user's demand for wireless services. From the beginning of the issuance of 3G license plates to the present, 3G wireless network cameras have been applied, such as 3G patrol cars and 3G individual soldiers, which have dramatically accelerated the wireless network video market. Therefore, when 4G is officially commercialized, the market demand for wireless network cameras, especially wireless HD network cameras, will increase dramatically.
â—‡ Intelligent Application The intelligent behavior analysis function is currently used mainly for video occlusion and video loss detection, entrance and exit statistics, item legacy identification, intrusion detection, video motion detection, crowd movement, and congestion identification. Intelligent monitoring can identify behaviors and types from complex data analysis, provide operational commands, data and information, and implement intelligent actions such as alarms, reminder attention, and intelligent retrieval. Intelligent monitoring is an auxiliary means to prevent crimes from occurring and enhances monitoring efficiency. Moreover, smart devices can selectively transmit video, which effectively saves bandwidth and greatly improves the utilization of available network bandwidth. HD network cameras can embed intelligent video algorithms into cameras and become integrated HD intelligent network cameras. This not only reduces the overall cost of the project, but also improves the efficiency of system monitoring. Intelligent monitoring has become the main direction of monitoring technology development and market demand. Integrated high-definition intelligent network cameras will soon become the mainstream of intelligent video surveillance. Web video camera. It not only reduces costs, but also reduces equipment nodes and improves equipment stability. Intelligent monitoring has become an important topic for monitoring technology development and market demand. The integrated high-definition intelligent network camera will soon become the mainstream of intelligent video surveillance.
One of the applications of Internet of Things (IoT) technology is RFID radio frequency identification (RFID) technology. It can identify specific targets through radio signals and read and write related data without the need to establish mechanical or optical contact between the identification system and a specific target. HD network cameras can also use built-in RFID technology to achieve unified video and positioning. The high-definition video imaging technology based on high-definition network cameras also provides a good foundation for video applications, and the intelligent application of high-definition network cameras centered on the Internet of Things will gradually increase.
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