Intelligent cctv cable Video Surveillance. Future video surveillance systems will not only be limited to the passive provision of video images, but also requires the system itself has enough intelligence to be able to identify different objects, detect abnormalities in the monitor screen, the fastest and best way to issue alerts and Provide useful information to more effectively assist security personnel in dealing with crises and minimize false positives and omission, which is a powerful tool for dealing with attacks and dealing with emergencies. Intelligent video surveillance can also be used in traffic management, customer behavior analysis, customer service and other non-safety-related scenes to improve the user's return on investment.
Related technical progress
1, CMOS image sensor technology is mature
The camera's image sensor is gradually moving from the traditional CCD to CMOS. These two sensors have their own length, but all along, the CMOS sensor shortcomings gradually reduced. CMOS image sensor low cost, high integration for its main features, image quality has not lost in the CCD. Compared to CCD-based probes, CMOS probes are more integrated because the CMOS sensor integrates many peripheral processing functions, requiring fewer devices than the CCD probe, and the power consumption of the CMOS probe is much lower. From the whole system, CMOS sensor can greatly reduce the cost.
2, the development of intelligent analysis technology
IEEE in the image of intelligent analysis and other aspects of relatively large results, such as motion detection, face recognition, target tracking and so on.
Motion detection refers to the identification of images in the specified area changes, the detection of the existence of moving objects and to avoid interference caused by changes in light. Due to the dynamic changes of the background image, such as weather, light, shadow and chaos, the motion detection becomes a very difficult task. Early motion detection is to compare the generated I frame after encoding, through the video frame comparison to detect the image changes. Currently used methods are Background Subtraction, Temporal Difference, Optical Flow, Motion Vector Detection, and so on.
3, chip technology for video surveillance products to provide new programs
IP cameras typically integrate video capture, video encoding / processing and network interface functions. In the video surveillance market, the ability to support these features of a variety of video signal processor chip performance is very different, but also the most prominent advantages of the product. From the low-end products with the least functional requirements to the high-end products with high-performance multi-core digital signal processor (DSP) chips, the requirements for video signal processors are very different for different markets. High-performance DSP chip to video processor performance has been greatly improved. These DSPs are the key to the birth of smart cameras. Because of these DSP, IP video server has the ability to simultaneously manage the multi-video stream intelligently.
4, video compression format more and more advanced
The previous digital video surveillance image format mainly MJPEG and MPEG2 mainly. With the improvement of image compression technology, there has been an increasingly advanced video compression format, such as MPEG-4, H.264, China is vigorously developing the AVS encoding format with independent property rights. The development of video compression technology for video surveillance in image transmission, video storage and so on bring great benefits.
The main problems faced and the development trend of technology
At present, large-scale network video surveillance business is still in the initial stage of exploration, network, digital, intelligent video surveillance is an inevitable trend. Faced with this trend, the current video surveillance in a number of key technologies, there are many shortcomings, mainly in the following areas.
1, the media distribution
The current video surveillance system in the distribution of video media generally relatively simple to deal with the general use of the user directly to the network camera access, or through the video server for simple media forwarding processing, and the face of an increasingly large user base, which Media transmission will be the bottleneck of image transmission. Whether the efficient media distribution mechanism will become an important indicator of the merits of video surveillance system.
In fact, the media distribution is any video business in the development to a certain size will face problems, video surveillance and other video services - such as IPTV - to jointly study the issue of video distribution. The future video surveillance system will be based on a relatively complete media distribution platform to transmit real-time video information and video video information.
2, video storage
At present, the network-based video surveillance system basically uses the central video server to store the video. Central video server management is convenient, safe and reliable, but because the video at any time, the data flow, the load network brings great pressure. If the video storage edge, although you can reduce the number of video streams, slow down the load network pressure, but the scattered video data will bring a lot of trouble recording management, video data security will be greatly reduced. Thus, the future of a large number of storage needs of the location can not be unified by the central storage to bear, and a large number of distributed, differentiated storage is not available technical solutions. The future of the video surveillance system in the video storage aspects of a reasonable structural design, in order to meet the actual video requirements.
3, concurrent scheduling
The current video surveillance system users in a video monitoring point generally do not exist concurrent demand, even if the bulk user may be the same video monitoring point of the information at the same time call request, this call is no difference. In the future, the user service source of the system is diversified and uncontrollable, and the purpose of the existence of the same situation, the monitoring system for the same monitoring point there is a concurrent call problem, it must consider the priority and allocation mechanism.
The current video monitoring billing mode is very simple, usually to rent the main, or just consider the user access to use a single video monitoring point of the upload information or the length of time, the business billing point and billing standards do not need Too complicated, generally consider a simple RADIUS protocol can be. Future billing system to consider the billing system, including single-user single-use, single-user multi-resource use, multi-user multi-resource use, which is a single billing point and billing standards, relying solely on the current concise Simple billing protocol can not support. Future systems should support multi-service policies that can be flexibly changed and can be implemented in batches to support real-time accounting for the various business policies described above.
Some of the current remote video surveillance systems can support hierarchies, but this classification only involves the classification of content distribution, the network of other sub-function system or as a level to consider.
The future video surveillance system need to consider the classification is not only the content distribution on the classification, because the whole network in different areas of service providers for user control, business management, content distribution, operational support these four levels of grading requirements are different , This point on the user control and business management on the needs of the classification closer to the conference TV system rather than a simple point to point session system, the need for all redesign.
6, business integration
The current remote monitoring does not take into account the interrogation between other business systems. The future video surveillance system will be crossed with a number of other business systems, multi-layer interoperability between different systems and resource sharing must be considered.
From the previous analog monitoring to the current digital monitoring; from the off-site monitoring to the advanced remote monitoring; from the people to monitor the current unattended monitoring, video surveillance is moving in the digital, network, large-scale direction of vigorous development. Of course, there are still many problems that need to be further explored. Compared to other communications services, video surveillance business is relatively young, video surveillance market is still not yet able to control the entire market leader. For the communications equipment manufacturers and telecom operators, video surveillance will be a good opportunity for development.