Buy network camera must understand the relevant knowledge

Buy network camera must understand the relevant knowledge
Currently the network camera video compression algorithm mainly includes: M-JPEG/MPEG4/H.264, H.264 places in the country for the mainstream, basically done MainProfile compression level, but different manufacturers in the details of the optimization algorithm on are different. Some manufacturers, such as the full launch of the full range of Megapixel IP cameras are using H.264 compression algorithm, can support 720P/1080p full frame rate HD video output. Image quality at the same time ensure quality, technical standards for H.264 compression coding efficiency were significantly improved and enhanced the amount of data after compression MPEG4 only 1/3, greatly reducing the transmission bandwidth and back-end storage pressure . And taking into account different network environments, H.264 compression algorithm can be based on different network environments using different transmission rates, and the ability to self-regulate bandwidth utilization, optimizing the network bandwidth resources, but also provide users with a more more practical application experience. In addition, HD Network Camera supports H.264/MJPEG/JPEG video encoding, supports dual-stream, the user can according to the actual application requirements, to carry video data multiplexing, enabling multi-application operating selectivity.
Comparative analysis of the SDI camera
In terms of quality SDI video cameras and HD Network Camera can achieve 720P/1080P level or even SDI cameras can also provide higher transmission frame rate, generally up to 30-60 frames / sec real-time image acquisition. And SDI cameras with high resolution images, higher resolution, richer color and other characteristics, to meet the user demand high-definition monitor. Currently, as a specialized market for high-end security monitoring equipment, SDI camera image quality on its excellent quality and system architecture is relatively simple features, so that in some special industries have better prospects.
But in low light, wide dynamic cameras and other basic functions, SDI cameras and HD IP Camera are there is room for improvement. Now SDI Camera with CCD imaging chip more more, CCD chip photographic performance is better than CMOS, relatively speaking, the monitoring results to be better at night. Existing HD image sensor light sensitivity are not ideal, at night in low light situations to capture the image less effective, therefore, effectively enhance the image sensor performance is critical. Besides increasing the illumination photosensitive chip performance, now also with the infrared technology, thermal imaging and other technologies to obtain the desired picture effect, so that the night monitoring the effect is improved, so that 24-hour monitoring more perfect, more efficient.
In addition, the most important is the camera SDI transmission distance is very limited, it can only transmit 100 meters. The network camera can be transmitted as long as relying on the network, which is the biggest difference. Moreover, due to front-end SDI cameras capture a large amount of data, the transmission process without warp codec compression, data storage presented to the great challenge. But the network HD camera uses H.264 compression algorithm that can save transmission bandwidth and storage space.
In summary, SDI cameras and HD camcorders have their own web applications and focus, they are complementary rather than substitute relationship. SDI Camera To get a larger application space, the transmission distance may be a bottleneck, so the need to break the transmission distance SDI cameras only continue to meet user needs, SDI cameras in order to have a broader development prospects. For network camera video compression algorithm re-optimization, there is both high quality low bit rate, is still the focus of its performance. Then, either SDI cameras, or network cameras (SD or HD), low-light, wide dynamic camera should have the basic need for both high performance for both continuous improvement.
Intelligent and more reliable backend
Intelligent network cameras now includes two solutions, one is in front of the camera at intelligent analysis, and the other one is in the back-end server to achieve intelligent analysis. Front-end analysis of the advantage of not requiring server support, can be applied individually, the disadvantage is the limited capacity of front-end chip processing, not suitable for complex, large workload analysis. Especially in some special applications or applications where a single function, such as traffic, traffic statistics, etc. Another example, often only need to analyze information and license plate counting, this time in front of the camera intelligent analysis applications, it can satisfy user monitoring requirements.
Taking into account various factors, some manufacturers gradually introduced a unique solution that is done in the back end analysis, analysis of the advantages of doing backend processing ability, and another advantage is more flexible, you can always opt for one front-end analysis or do not do analysis. If applied to large mall video surveillance cameras, the need for shopping areas, elevator, passageways, entrances, parking lots, warehouses and other places of real-time monitoring, since monitoring points are more often prone to the phenomenon of image information redundancy for this a problem, some manufacturers have chosen to do intelligence analysis on the backend server, the user can according to their needs, always select the front need to monitor key sites for monitoring intelligent analysis, makes the application very flexible, powerful processing capabilities and the server it is possible to cope with large amounts of data analysis, especially for end users of analog cameras, the more important. Existing analog cameras can be retained, just on the backend server embedded intelligent analysis module, thus saving tip replacement cost for the network HD cameras. Visible, backend intelligent solutions for their professional safe and reliable features, has been widely supported by the majority of industry users.
The main reason for the popularity of failed
At present, from our point of view the whole security industry, network camera also failed to gain popularity scale, mainly in the following three reasons. First, the technology is very mature with respect to traditional analog surveillance system already familiar with networking and commissioning for analog systems engineering personnel, it is relatively unfamiliar, or a little more difficult. As we all know, the IP Camera is relying on the existence of the network, the network itself and the status of the application effect is closely related to network cameras. Throughout the network environment based on the application of effects, such as network monitoring system is based on a network has been built, the original network infrastructure can meet monitoring requirements, needs to be considered; while the new network-based network monitoring system, Construction of the new network will be faced with greater investment environment, users may make large investments unbearable. In addition, access to the network camera will be domain names, IP addresses and other problems, and network security issues are also the focus of the user, so that the joint effect of many problems have hampered the widespread application of network cameras. But in network security, now Megapixel IP cameras have built-in VPN protocols of international norms, enabling seamless connectivity and network security devices can be safely connected to the internal LAN from the Internet, which greatly improves the audio and video security, to prevent the camera through the network cable intrusion internal network. In addition, the generally HD Network Camera also has a built-in UPNP protocol, plug and play, no need to change the firewall settings and other network security devices, but also reduces debugging difficult.
Second, some standard definition network camera image effects not as analog cameras and network camera also vexing non-real-time, are also boosting the still massive selection of analog cameras and surveillance market firmly occupy the mainstream position. However, with improvements in technology and user needs improvement, high definition has become security vendors continue to pursue the goal, 720P/1080P HD camcorder increasingly favored by the users. In some mainstream manufacturers, for example, last year the grand launch of a full range of one million high-definition cameras are to follow the standard H.264 algorithm, can achieve 1920 × 1080,1600 × 1200,1280 × 720 million full-time HD video support 1600 × 1200 multi-stream video output, can easily achieve high-definition monitor, can truly capture clear image detail, picture quality than conventional D1 promoted four times, so that the high-definition camera applications has become more widespread, you can optimistic forecast, in high definition , network video monitoring trends, the network will show the HD cameras and rapid development momentum.
Finally, the IP Camera costs are still high. Compared with analog cameras, because the network camera market is not mature, its price is high, so a lot of industry users prohibitive. With China's domestic enterprises bigger security camera gradually mastered the core technology, domestic compression chip large-scale applications, many domestic security companies have introduced a wide variety of network cameras. Some manufacturers even have a full line of HD IP Camera , to provide users with more choice. This means that prices will inevitably have a more substantial downward adjustment, the current price ofHD IP Camera has become increasingly close to traditional analog cameras, so that more users can affordIP Camera.
From:http://www.vstarcam.com/channel/Buy-network-camera-must-understand-the-relevant-knowledge-135.html