For monitoring system,HD is a complete technical concept,from image acquisition,conversion,compression,transmission,storage,control,and display a complete image processing.And on the whole video monitoring system, front-end image acquisition device that the camera lens, is the core of the whole system, or the entire system can be likened to the “eyes .” If there is no front camera lens , video surveillance can not be achieved , just as human eyes can not see everything in the world is no different . If there is no front camera lens , the monitoring system will not be able to capture high-definition video surveillance images. Over the years, the video surveillance industry researchers has been to improve the image resolution video surveillance and make unremitting efforts . With the continuous development of video technology, especially the image sensor chip technology, video surveillance cameras to continuously improve the clarity , the development of horizontal resolution to 420 lines from 380 lines , 480 lines , and then to 540 lines, 600 lines , 650 lines . Before the advent of HD network cameras , analog cameras resolution almost every year increased significantly, it has also become the focus of attention in the industry . HD monitoring system to be used in the early days of high-end areas of finance , police, schools, smart cities. Analog era underlying core technology controlled by foreign manufacturers , domestic manufacturers are basically production assembly . Into the digital high-definition era, more and more manufacturers have written 3A algorithm , master surveillance cameras clarity , color , focus , exposure and other technologies. In addition, the digital high-definition era, as a competitive high-definition monitor manufacturers must be able to provide the IPC, NVR, Hybrid DVR, decoders, and other platforms supporting a full range of products and solutions , rather than the only IPC, it is precisely this point , the advantage of a larger domestic manufacturers have done a DVR video surveillance software today with domestic manufacturers to make high-definition surveillance products before .
Surveillance cameras from the current domestic market, sales of HD network cameras continues to increase, analog cameras showed a downward trend. At present, many cities , such as peace , peace villages , safe campus , bank monitoring projects bidding requirements definition network cameras , resolution 1280 × 720P or more, because in many civilian surveillance IP high-definition picture quality, wiring is simple, comprehensive cost advantage of low user acceptance . Digital HD with IPC to many security companies has brought new opportunities , we face a re- race , many manufacturers hope that a new era of high-definition digital transfer , or hope to achieve greater sales in major reshuffle in the new high-definition era , more focused technology . R & D strength of enterprises to take advantage of high -definition technology threshold , high starting point , the lack of technical research and development of high-definition analog processing block outside the door . As enterprises gradually mastered the core technology of IP cameras , more easily personalized and differentiated , thus avoiding the homogenization of vicious price war . Compared with the analog era , the era of digital high-definition is more conducive to the development of enterprise development . IPC will face the same price wars and DVR era , and even more violent times faster than the DVR price war came . After experiencing a war, the industry will return to a peaceful , industry will be more orderly, industry rules, more rational norms , profit rationalize the division of refinement, have their own strengths . The reason beyond the analog camera and network camera is dependent on the 3G network exists . Creating a monitoring network cameras wired and wireless network transmission times. Wireless monitoring is also convinced of the advantages of each firm , and has been strongly recommended network camera to the civilian market . The arrival of 4G era undoubtedly gave the development of the network camera to bring the gospel . Three operators have already started the construction and testing of 4G . In the end , 4G network will cover 100 cities, 200,000 base stations, one million terminals of this exciting news gave the security monitoring industry has injected a shot in the arm . At this stage, megapixels network camera to bolt and hemisphere -based, but as the technology matures and user needs increasingly clear , network cameras will also be derived million HD network dome camera . As in remote or network monitoring system is not easy to build a network environment , in order to achieve the effect of high-definition , high-definition camera through a wireless network to solve the problem of terminal access .
Core technology network camera is its video encoding compression technology. The current network cameras include general-purpose DSP chip technology and ASIC chip technology are two implementations . Due to domestic users for bandwidth and frame rate requirements more sensitive , requiring low bandwidth transmission rate of 25 still meet , so the MPEG-4 H.264 algorithm algorithm especially great in the domestic market . H.264 compression algorithm is 2-3 times more than the MPEG-2 , MPEG-4 is a 1.5 to 2 times . Therefore, the optimization of the H.264 algorithm manufacturers have much room for improvement to meet customer demand for bandwidth is occupied . In addition, the megapixels camera application H.264 encoding is the future direction of development, but now the situation is different each algorithm, compression quality, and the effect is different, more important is the resolution of the camera now supports 1920 × 1080P has come out, but at the same time almost no support 25ips manufacturers are now able to do 720P @ 25ips has been pretty good , so this is the future trend of development.
Compared with ordinary camera sensor chip , high-definition camera on the same pixel dimensions as multiples of increase , so will the corresponding multiples sensitive spot size decreases, so under the same exposure conditions , high-definition camera pixel camera with respect to the ordinary low light performance will be a lot worse. This means that if the night is much higher intensity of infrared fill light needs than ordinary pixel HD camera infrared camera . For example, a 1.3 million pixel 1 /3 ” HD size CCD, with respect to the 430,000 pixels ( 480 lines ) 1 /3″ size of an ordinary CCD, pixel high-definition CCD unit area is three times the normal CCD , the HD CCD pixel CCD photographic performance compared to ordinary sensitivity 1 / 3 , which is the HD camera the night of the root causes of poor results . Current practice is to extend the exposure time to compensate for poor low light performance deficiencies , but this will cause the image prone to smear phenomenon . If the high-definition image quality is much better at night , it can only increase the ambient illumination to supplement this regard. For HD fill light , the HD camera infrared light to monitor different distances have different options to configure . Wide angle close- choice LED light board to fill light , wide-angle monitoring can be achieved at a lower cost , long-range due to the need for fill light intensity is relatively large , the angle is small, the use of ordinary LED difficult to achieve the desired effect. Therefore, in the distance with a strong directional selection , energy focused laser infrared light to fill light.
Different from the traditional analog cameras ,megapixels ip camera comes to IT category , therefore , network cameras and analog cameras in use there is a large difference , especially for the operator and the use of personnel have higher requirements . For most domestic contractors, integrators and users, their traditional CCTV system is very familiar with the early stages of network cameras still in use , so the network camera in the development and design , taking into account the characteristics of these people , in the convenience and ease of use have installed on fully reflected , for example, supports PoE power supply, local video output , as well as convenient local debugging , support wireless functions. The basic definition of the term is accompanied by the start of high-definition television , became popular many years ago . However, for the surveillance industry , real large-scale application is a recent one or two years , which is mainly the rapid development of monitoring technologies, including coding technology, network technology , transmission technology , storage technology, high-definition monitor as possible, the overall technical program gradually mature, gradually being accepted by users ; of course , the user monitoring needs change , pushing for HD also played a positive role. Compared with the standard definition , whether it is from the resolution , display or fluency , the HD than SD advantage. From the resolution point of view , 720p resolution CIF resolution is 9 times , 1080i/1080p CIF resolution is 20 times the resolution of the display in the same environment , will be much clearer definition . From the display , the HD supports both large-screen display , and support for 16:9 widescreen display , you can greatly enhance the user’s viewing experience. From the fluency of view, HD support higher frame rates , such as 1080i/1080p can support 720p and 60 frames / sec or 60 fields / sec , and its standard-definition images fluency than twice as high . Therefore , high-definition monitor is one of the most mainstream monitoring industry trends , as acquisition front-end ,HD network camera trend is also moving along .
With the monitoring system from analog to digital, from closed towards the network, based on open standards to meet the needs of interoperability between devices, systems increasingly urgent. And in the Internet age , engaged in the construction of open standards , to provide users also have the flexibility and scalability of security systems, security companies have been competing to become the local market , globalization choice. As important products of network monitoring , standardization of the road megapixels ip cameras have become a necessity . Following ONVIF, PSIA have been established , HDcctv Alliance also set up to form the current three standard network video surveillance market . Establishment of these organizations are promoting the realization of hope in the Internet age surveillance standard unified vision. For example ONVIF, hope that through a global open interface standards to promote network video applications in the security market , the interface standard will ensure that different manufacturers of network video products with interoperability. Founded in August 2008 of the PSIA interoperability physical security alliance , the goal is for the physical security of hardware and software platforms for the creation of a standardized system interfaces , so that the different security systems based on IP network compatibility . The HDcctvAlliance are mainly co-founded by chip manufacturers and system suppliers, mainly for the development of new standards HighDefinitionSurveillanceSystems to look through the new standards , development easier to build , lower cost network solution.
Intelligent digital network is the inevitable trend of development , so as to achieve pre- warning, real safety. The network cameras will be an ideal platform for hosting intelligent technologies , especially adding intelligent algorithms and objects abnormalities software , network cameras will become an important development of intelligent network camera direction . On the whole , the simple intelligent analysis , including motion detection, tampering and other , more sophisticated intelligence analysis includes identification and analysis of behavior , such as face recognition, packet loss , alert and so on. The concept of intelligent analysis of previous years has been very hot , in a variety show many manufacturers are urgently launched related products , including network cameras with intelligent analysis functions. However, due to the complexity of the actual use of the environment , coupled with the algorithm itself is not very mature, and adaptability is not strong , resulting in a lot of false alarm . On the other hand the high customer expectations , but in actual use smart products of poor performance is often difficult to meet the actual needs of customers, and high maintenance costs , often makes these devices become a decoration. There is no doubt , however , intelligence is an inevitable trend , with the increase in the number of surveillance Imagine dozens, hundreds or even thousands of road way video , 24 hours a day by human eyes staring , unrealistic impossible. How to quickly extract data from a mass of useful information for the user, which is very effective , but also customers eager to be solved, which will also become one of the current and future market competition point network camera products .
HD network camera
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