A clear high-definition technology bottlenecks and obstacles
Affect the definition of large-scale application of the bottleneck, the first is a technical issue, the promotion of high-definition, there are still technical obstacles. For example, CCD sensor power consumption, CMOS wide dynamic sensor problem. Second, price is also high. Once again, the user's understanding and acceptance of a process.
Currently, the market leading HD monitoring equipment is high-definition camera. Cost, low-light sensitivity and other key issues, most of the HD camera performance is not satisfactory. HD IP cameras currently used in the chip, there are two, one is the CCD, the chip technology is relatively mature, but the cost is higher; and the other a CMOS chip is more expensive, but its drawback is that in low light cases, more noise. As most of the HD cameras are using CMOS sensors, the lower its sensitivity to light, even the use of megapixels CCD sensor than the average low-light CCD also have much lower sensitivity. To the night is dark, and monitor most of the time period to prevent precisely at night, so that would make the high expectations of the system into a high-definition video display.
Traditional analog video camera manufacturers in the processing of production experience and have a certain foundation, but in the digital high-definition cameras and network video standard is not formed to promote open, the front of the camera manufacturers do both, but also development and production of back-end recorders and monitoring software, This is a process-based simulation prior to a general lack of camera manufacturers have accumulated. In addition, digital high-definition optical light sensor inside the camera and image processing technology, manufacturers generally do not accumulate in this area of development. Traditional common network cameras and video server manufacturers, software in the background, they will accumulate some experience, but also analog video camera manufacturers have encountered the same resistance. Semiconductor companies want to make a complete technical solution, hope that any company can produce, but also limited the formation of network video standards and promotion, the company must provide a variety of light-sensitive semiconductor devices of illumination, infrared, wide dynamic full range of video camera and a wealth of back-end equipment and the core software, in order to attract a large number of manufacturers do not develop into a million high-definition processing vendors.
Before the era than the semiconductor analog camera program will also provide free complex.
Second, a large transport and storage challenges
The application of high-definition only in some industry solutions, in some industries there are some applications, in the regular monitoring of the market, high-definition monitor has not spread, the network environment is also a limitation of this rigid quotas to promote high-definition video surveillance is an important factor. From the technical standards in terms of, 720P resolution is CIF ordinary SD 9 times, 1080P resolution is currently the CIF SD about 20 times, front-end HD cameras will undoubtedly bring a huge data flow, and the system can not achieve high-definition, the first face of the transmission system is able to accept such a large high-definition data streams.
Transmission of high-definition monitor current IP networks are based on the way, it can not access traditional monitoring systems, the traditional access control system can only use high definition SDI or SCDMA mode of transmission. This transmission of the transmission distance is limited and can only be achieved through the fiber link, but the HD-related equipment has just started, the equipment cost is very high. And even with fiber-optic transmission, but also solve the problem of real-time browsing, video storage still can not get rid of encoding and IP transmission.
Network HD camera is the main force in high-definition surveillance systems, and thus network monitoring has become the most economical high-definition transmission mode selection, but also being affected by network bandwidth constraints. There are three ways network, first 3G wireless network, and second, Wireless Network, the third is the optical network. If the transmission high-definition video, fail to meet requirements of today's 3G wireless network. HD video requires 2MB upload bandwidth, and today the upload bandwidth of WCDMA and CDMA2000 is only 600KB to 800KB, TD-SCDMA to be more bandwidth is narrower, and such conditions can only transmit lower resolution bandwidth of the 4 channels CIF or D1 all the way , also can not transmit high-definition video. Based on the current size calculation megapixels HD 720P, D1 stream is about 2 times the bandwidth of 4M, while calculated to 1080P, D1 stream is five times the bandwidth used is approximately 10M. With 100M Ethernet, for example, under the premise of ensuring smooth, in fact, about the same time can only carry 5-way high-definition images, but if the same video source with multiple user access, the bandwidth will be even greater. Gigabit Ethernet can take into dozens of roads, high-definition surveillance systems for small-scale, can be an effective solution for large projects, the transmission performance will become a stumbling block.
At the same time, it means that high bit rate HD resolution, which is not only just for monitoring hard drive with a greater challenge, but for the entire storage system capacity, performance, cost is no small challenge. The most basic 720P HD monitor, for example, the normal hour video about the hard disk capacity required 4G8G / hour, for economic considerations, to reduce the compressibility of 3GB per hour video about capacity. In this instance, the calculation of time saved by a month, 8-way monitor about 17T (17000G) capacity is about, which just drives the price of conversion of million. Doubling the video capacity, will inevitably lead to a doubling of storage costs.
Relatively high investment in high-definition applications, which mainly invest in infrastructure and investment in the system itself. The deployment of high-definition system for storage, network bandwidth requirements and other infrastructure facilities, higher than the SD system; and the cost of HD equipment itself will be a lot higher than the standard definition product. From the user's consideration, the current market is not mature, the cost of expensive high-definition monitor general security does not meet the requirements of the market, people are more inclined to use the network video surveillance, or even mixed system, after all, the cost of the entire security project for the Chinese Security Market is still quite high. For many ordinary users, investment cost is an important factor in their choice of one further.