Tags: Video Surveillance HD Smart
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As the core equipment in the network video surveillance system, the application and popularity of the network camera represents the degree and stage of the development of network video surveillance. Needless to say, network cameras are gradually adapting to the current and future diversified needs, and will become the mainstream products in the field of video surveillance. This article will discuss the future development direction of network cameras:
HD
The term HD is basically started with HDTV and became popular many years ago. However, for the monitoring industry, the real large-scale application is the last one or two years. This is mainly the rapid development of monitoring technology, including coding technology, network technology, transmission technology, storage technology, etc., high-definition monitoring becomes possible, the overall technical solution It has gradually matured and is gradually accepted by users; of course, users' changes in monitoring requirements have also played a positive role in promoting HD.
The Shanghai Pudong City HD video coverage project is a typical representative. The project is currently the largest single high-definition video surveillance project in China and is currently the world's largest HD surveillance project. This project has more than 10,000 monitoring points and adopts high-definition technology on a large scale. It has become the first large-scale high-definition monitoring project in the Chinese surveillance market. It has played a positive role in promoting the development of high definition and has a milestone significance.
Compared with standard definition, HD is more advantageous than standard definition in terms of resolution, display effect and fluency. In terms of resolution, the resolution of 720p is 9 times that of CIF, and the resolution of 1080i/1080p is 20 times that of CIF. In the same display environment, HD is much clearer. From the display effect, HD supports both large screen display and 16:9 widescreen display, which can greatly enhance the user's viewing experience. In terms of fluency, HD supports higher frame rates, such as 720p and 1080i/1080p, which can support 60 frames per second or 60 fields per second, and its image fluency is twice as high as that of standard definition. Therefore, high-definition monitoring is one of the most mainstream trends in the development of the monitoring industry. As the front end of the acquisition, the high-definition trend of the network camera has also followed.
Standardization: Onvif, Psia, HDcctv
As surveillance systems move from analog to digital, from closed to networked, the need for connectivity between devices and systems is increasingly urgent based on open standards. In the network era, the security system that is dedicated to the construction of open standards and provides users with flexibility and scalability has become the best choice for security vendors to compete in the local market and achieve globalization. As an important product of network monitoring, the standardization of network megapixel cameras has become inevitable.
Following the establishment of ONVIF and PSIA, the HDcctv Alliance was also established, thus forming the three major standards for the current network video surveillance market. The establishment of these organizations is the vision to promote the unification of monitoring standards in the Internet age. For example, ONVIF hopes to promote the application of network video in the security market through a global open interface standard. This interface standard will ensure interoperability of network video products produced by different vendors. Established in August 2008, the PSIA Entity Security Interoperability Alliance aims to create a standardized interface for the hardware and software platforms of physical security systems, enabling compatibility of different security systems based on IP networks. The HDcctv Alliance (HDcctv Alliance) is mainly established by chip manufacturers and system suppliers, mainly for the new standards developed by High Definition Surveillance Systems, in the hope of developing new standards through new standards. Easy to build, lower cost network solution.
intelligent
Overall, simple intelligent analysis includes motion detection, occlusion alarms, etc. (currently these features are already widely used).
More sophisticated intelligence analysis includes behavior recognition and analysis, such as face recognition, packet loss, alerting, and more. Intelligent analysis has been very hot in the past few years. Many manufacturers have eagerly launched related products at various exhibitions, including various 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, the adaptability is not strong, resulting in a lot of false positives. On the other hand, customers' expectations are high, but in actual use, the poor performance of smart products is often difficult to meet the actual needs of customers, and the high maintenance costs often make these devices a device.
However, there is no doubt that intelligence is an inevitable trend. With the increase in the number of surveillance, Imagine tens, hundreds, or even thousands of videos, and it is unrealistic to stare at the eyes 24 hours a day. How to quickly extract useful information from massive data is very effective for users, and it is also an urgent need of customers to solve it. This will become one of the market competition points for current and future network camera products.
Because IP megapixel cameras provide more critical details, this enables higher precision in video-based intelligent analysis, greatly increasing the level of smart applications. It has grown rapidly in some market segments, such as transportation, and related smart product development and application are relatively mature, such as road condition analysis, vehicle statistics, license plate recognition, retrograde, yellow line, illegal parking, including traffic condition monitoring. And the capture of illegal acts, etc., have been widely used.
Infrared
Compared with the ordinary camera sensor chip, the high-definition camera increases the number of pixels on the same size, which results in a corresponding multiple of the size of the photosensitive spot. Therefore, the low-light performance of the high-definition camera is much worse than that of the ordinary pixel camera under the same exposure. This means that if the HD camera night infrared fill light demand is much higher than the ordinary pixel infrared camera. For example, a 1.3 megapixel 1/3" size HD CCD, compared to the 430,000 pixel (480 line number) 1/3" size ordinary CCD, the pixel area of ​​the HD CCD per unit area is 3 times that of the ordinary CCD, then HD The CCD pixel sensitivity is 1/3 of the normal CCD sensitivity, which is the fundamental reason for the poor performance of HD cameras at night. The current practice is to extend the exposure time to compensate for the shortcomings of low illumination performance, but this will cause the image to be smear. If the high-definition night image is good, it can only increase the ambient illumination to supplement this deficiency.
For high-definition fill light, high-definition camera infrared fill light has different scheme configurations for monitoring different distances. The LED light board with wide angle is used to fill light at a short distance, which can realize wide-angle monitoring and low cost. The medium-distance distance is relatively large because of the required intensity of the fill light, and the angle is small. It is difficult to achieve the desired effect by using ordinary LED. Therefore, in the medium and long distance, a laser infrared light with strong directionality and concentrated energy is used to fill light.
Ease of use
Unlike traditional analog cameras, IP megapixel cameras are involved in the IT field. Therefore, there is a big difference between the use of network cameras and analog cameras, especially for operators and users. For most domestic engineers, integrators and users, they are very familiar with the traditional CCTV system, and they are still in the early stage of the use of network cameras. Therefore, the development and design of network cameras should take into account the characteristics of these people. It should be fully embodied in the convenience of installation and ease of use, such as support for PoE power supply, local video output, and convenient local debugging and wireless support.
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