New breakthroughs and future trends of HD surveillance dome technology

With the rapid development of networked, high-definition and intelligent technologies, high-definition high-speed dome cameras have been widely used in projects such as safe cities, and the market share has increased significantly. In the face of the huge market demand, on the one hand, various manufacturers have taken the initiative to accelerate the upgrade of high-speed dome network, high-definition, and intelligent technologies, and have continuously introduced higher-quality high-definition high-speed domes; The accumulation of property rights promotes the localization of the key components of the high-speed high-speed dome camera and the independence of the core image processing technology, thereby promoting its own high-speed dome products to surpass international brands in terms of design and technical performance.

For a long time, the position of the high-speed dome in the field of video surveillance is irreplaceable. Its unique functions such as 360-degree dead angle monitoring, fixed-point cruise, and zoom monitoring are not owned by other types of cameras. Since its development, the high-speed dome has basically entered high-definition, which is the trend of the network and high-definition development of the security industry, and it is also its own technological advantage with high-definition image quality, wider coverage, high scalability, and intelligent feature upgrades. Decided.

According to the survey results of the domestic high-speed dome market in the first half of this year by China Public Safety magazine, high-speed dome cameras account for about 30% of the dome market. Among some mainstream IPC suppliers in China, the high-speed high-speed dome camera accounts for even more than this value in all IPCs. In the periphery of safe cities, transportation, and parks, high-definition high-speed dome cameras have become the mainstream of PTZ high-definition IPC construction.

Dome camera localization drives the market

The high-speed high-speed dome camera has the same development speed as the high-definition camera. There are two main reasons: One is that HD technology is becoming more and more mature. The use of a new generation of high-resolution CMOS sensors and high-performance encoding chips has made great progress in the image quality and picture smoothness of the network high-speed high-speed dome. Some manufacturers who were originally watching have joined the high-speed high-speed dome market; The cost of high-definition movements and dome cameras has fallen.

These two aspects have promoted the rapid growth of the market of high-definition dome cameras, especially the low-cost solution of high-definition dome cameras is rapidly invading the traditional analog dome market. In the face of the domestic market's preference for the commonality of cost performance, the low cost of the dome camera will inevitably have an impact on the market, and the application will increase accordingly; coupled with the current strong domestic demand for high-definition surveillance, the application cost of the high-definition dome camera is also With it. Speaking of the development status of high-speed high-speed dome, Li Yiyuan, technical support engineer of Hikvision, said: With the rapid development of networked, high-definition and intelligent technologies, high-speed high-speed dome cameras have been widely used in projects such as safe cities and have a market share The rate has increased significantly.

In the face of the huge market demand, on the one hand, various manufacturers have taken the initiative to accelerate the upgrade of high-speed dome network, high-definition, and intelligent technologies, and have continuously introduced higher-quality high-definition high-speed domes; on the other hand, each manufacturer has also paid more attention to independent knowledge The accumulation of property rights promotes the localization of the key components of the high-speed high-speed dome camera and the independence of the core image processing technology, thereby promoting its own high-speed dome products to surpass international brands in terms of design and technical performance.

In the current high-definition dome camera industry, although the core CMOS sensors and chips are still in the hands of foreign manufacturers, the localized development trend of high-definition dome cameras is very obvious. All-in-one movements produced by large manufacturers such as Hikvision, Dahua Co., Aode Huashi, Xiangfei, Jiaxinjie, Wave Granules and other large manufacturers have had a very good response in the market, compared with the high-definition movements of Hitachi and Sony. Although the product is still technically inadequate, the differentiation is gradually narrowing. In the future, high-definition movement products that may flood the entire high-definition dome market will come from domestic manufacturers.

Upgrade of movement, structure and coding performance

The main components of the high-speed high-speed dome are the dome cover, the gimbal, the high-definition movement, and the control PCB board. The infrared night vision products will also add infrared LED light boards. Throughout the technical development of high-definition dome cameras in recent years, it is undoubtedly focused on the development of high-definition dome cameras, environmental adaptability, night vision fill light, network coding performance and the application of intelligent technology.

Technology breakthrough of integrated machine movement promotes development

The high-definition all-in-one movement is the image source of the high-definition high-speed ball, and is the core part. Since Hitachi released the first 720P HD movement DI-SC110-C in 2009, it marks the official entry of the high-definition high-speed dome product into the security market. Subsequently, Hitachi's 1080P HD movement DI-SC220-C, DI-SC120-C720P HD fog transmission movement, 2013's heavyweight product DI-SC221-C1080P HD fog transmission movement, and Sony's FCB-H10, FCB- H11 and FCB-CH6300 have been launched one after another, continuously promoting the development of high-definition dome cameras.

In the past two years, with the advancement of high-definition image processing technology, domestic monitoring manufacturers with independent image processing technology have adjusted the image processing chip parameters to improve the color reproduction and clarity of the output image; incorporating 3D noise reduction technology to enhance nighttime Monitor the effect. Furthermore, due to the different wavelengths of visible light and infrared light, the dome camera is prone to the problem of virtual focus in scenes with visible light. At present, some mainstream manufacturers optimize the focus algorithm to intelligently determine the bright and dark areas in the image, which can achieve one-time alignment without repeating the focus and improve the difficulty of focusing. In addition, through the intelligent motion focusing algorithm, the focusing algorithm for moving objects is optimized, and the focusing speed is faster and the focusing accuracy is more accurate. Manufacturers apply these technologies to their own movements, and with the technological breakthroughs of various manufacturers' self-developed movements, some domestic movements have caught up with or surpassed mainstream imports in low-illumination, fog-through, and far-focus characteristics. Movement.

Structural breakthrough facilitates the dome's environmental adaptability

Most of the time, the application environment of the dome camera has to face the bad weather such as sun exposure, cold weather, rain, sand and dust, which will have a certain test on the appearance and structure of the high-speed ball. From the design of the shell material and shape, the transparency and firmness of the transparent dome cover, and the heat dissipation and waterproofing of the whole machine, there must be strict design standards. At present, with the entry of some suppliers with IT background, the industrial design of the dome camera has more features such as reliability, maintainability, aesthetics, and practicality. In some products, the ball machine of the International Industrial Design Award has appeared, leading the new trend of the ball machine structure design. For example, Zhejiang Yushi's all-weather dome camera adopts all-weather design such as shading, waterproof and dustproof, IP67, -40-70 degree multi-level temperature control, voltage fluctuation + -25% tolerance, etc. It is suitable for application in cold, heat, acid, gray In the severe environment of wind, wind and other environments; it can support electrical ports, optical ports, EPON flexible optional multi-service interfaces, and won the 2013 German IF Product Design Award, which is called "Industrial Design" "Oscar Award", and the IF Award focuses more on product innovation and practical business value.

Night vision fill light to make up for lack of low illumination

As we all know, the low-illumination effect of high-definition video surveillance has always been a shortcoming that plagues its applications, as do high-definition dome cameras. Especially in the field of night vision monitoring, if you do not use supplementary light to cooperate with monitoring, the effect of the monitoring screen cannot be guaranteed at all, so the meaning of monitoring is lost. At present, the more mainstream method is to use infrared fill light, that is, use a high-power infrared LED light source (commonly known as "dot matrix infrared lamp") or a laser light source to perform synchronous fill light, so that the clarity and brightness of the picture are guaranteed. In recent years, the popularization of infrared high-definition dome cameras and laser dome cameras has greatly improved the application problems that the dome cameras could not see clearly in the ultra-low illumination environment at night. Many high-speed dome manufacturers have spared no effort to launch a large number of infrared high-definition dome products , Of which there are some bright products.

For example, Kodak's IPC413 \ IPC423 series of high-definition infrared dome cameras have a built-in 360-degree pan / tilt, equipped with 20 times optical zoom, using the industry's top brand infrared lights, night monitoring distance of more than 100 meters, professional infrared light technology, infrared light angle and machine The core follows, and the picture at night is bright, uniform and less noisy. And with a wiper, in the outdoor environment can avoid the trouble of cleaning after the lens becomes dirty. Yushi Technology's infrared laser dome camera integrates 4 levels of follow-up fill light on the basis of all-weather dome. The farthest fill light can see the license plate at 200 meters and detect people, cars and objects at 400 meters. The dome camera sees the same amount of information at night and day. Hangzhou Tushi's multi-lamp integrated zoom infrared high-definition dome camera makes full use of the principle of optical design, so that infrared light is fully utilized, and has an unparalleled effect on the improvement of night vision effects of other infrared high-definition dome cameras.

Network coding performance

The high-speed high-speed dome has the same network coding performance as high-definition products. In the early days, the security industry adopted the standard H.264BaselineProfile video encoding algorithm, but with the improvement of platform performance, the encoding performance of H.264BaselineProfile can no longer meet the demand. For the encoding of high-definition images, the current H.264HighProfile video encoding technology has become high-definition The high-speed dome mainstream encoding format, whether it is TI or Hisilicon, can provide this encoding format in the subsequent DSP design. It is 20-30% higher than the original video encoding format, which can be used Bit rate transmission of high-definition video. The improvement of the encoding ability has greatly improved the image quality and fluency of the high-speed high-speed dome camera, and it has also played a role in promoting the application of high-definition video. Although there are rumors that the H.265 encoding format will be available in the near future, its performance is almost double that of H.264, but it is still unknown when it will actually be applied.

Intelligent technology comprehensively improves the monitoring effect

When talking about the "intelligence" of security monitoring, it is natural not to ignore the intelligent video analysis technology. A few years ago, intelligent video analysis technology was proposed. With the rise of high-definition video surveillance, it provides more room for application development. At present, intelligent video analysis technologies such as automatic target tracking, motion detection, over-the-line alarm, and personnel statistics have been widely used.

The intelligent technology of high-definition high-speed dome is different from intelligent video analysis technology, and its application range is wider. Thanks to the continuous improvement of chip computing capabilities and the emergence of intelligent algorithms, intelligent technology has been paid attention to in high-definition high-speed domes. In addition to the above-mentioned intelligent video analysis techniques, there are also alarm linkage, timed cruise, smart cruise, and 3D control technology. , Temperature monitoring and other intelligent applications.

At present, many manufacturers of high-definition dome cameras have made achievements in the intelligent technology of their products, and their products have been recognized by the industry. Among them, Kodak's gun-ball linkage automatic tracking system is the most representative, and it is a leader in terms of tracking speed, clarity, agility and accuracy.

Hikvision's DS-2DF7286-A new-generation high-definition high-speed dome camera uses a 1/3 "CMOS image sensor, coupled with a high-performance platform processing solution, reliable and stable performance, can provide intelligent motion tracking function, more monitoring Flexible and effective; it also incorporates the fog-passing function and SmartIR function, which enables clear images in fog and haze weather and prevents near-infrared overexposure. Tiandi Weiye ’s latest S3 series high-definition high-speed dome products support high-definition video intelligent analysis technology and automatic Tracking functions, these functions bring users more efficient use in actual scene applications, no longer rely on a large number of monitoring and maintenance personnel to "stare" at the screen.

The shortcomings of high-speed high-speed ball still need to be resolved

Although the high-definition high-speed dome's high-definition, 360-degree blind angle, fixed-point cruise monitoring and other functions have left a good impression, in the actual application process, some drawbacks have also surfaced, requiring manufacturers to work hard to solve.

Speaking of the shortcomings in the application of the ball machine, Guan Bei, senior product manager of Zhejiang Yushi Technology Co., Ltd., said that it is well known that when the ball machine is not rotating, it is equivalent to a gun machine. Nowadays, many cities are blindly pursuing the construction of dome cameras, but in practical applications, dome cameras are never used for cruising or tracking. When a public security incident occurs, due to the angle of the dome camera, the proper video within the camera range is not captured. The camera position does not play a real role. Therefore, from the perspective of actual combat application, how to take advantage of the dome camera's flexible zoom and rotation, whether it is possible to realize the effective and low false alarm rate of the dome's own functional advantages through the cooperation of the built-in intelligence and the actual combat business platform, is the whole Industry chain and solutions need to pay attention to the subject.

Zheng Ming, general manager of Hangzhou Tushi Information Technology Co., Ltd., discusses application issues from a practical perspective: At present, there are two shortcomings in the practical application of high-definition high-speed domes. The first shortcoming is interconnection. At present, the mainstream ONVIF, PSIA, GB28181 and other protocols access to third-party NVRs will have card framing, or PTZ can not be controlled and the dome function is seriously missing. The second short board is the problem of high-speed ball control. Compared with the traditional analog ball, the network high-speed high-speed dome has the inherent shortcomings of network delay. The current network high-speed high-speed dome control uses the PTZ control interface to control the zoom and rotation. Due to the delay of the network and the control step It is very difficult to control the current high-definition high-speed dome on the network. It is very difficult to monitor moving objects. In this way, the application experience of the network high-definition high-speed ball is reduced a lot, which is far less convenient than the traditional analog ball control.

In addition to the application, the dome camera's own technology also has room for improvement, such as sensors and low illumination issues. The movement on the high-definition dome camera mainly uses the CMOS image sensor. Because the CMOS uses the shutter exposure method, the dome camera has an image tilt during high-speed movement, and at the same time, the dome camera jitters under the condition of large magnification monitoring. This is also a common problem of CMOS movements in the industry. Another technical bottleneck is the improvement of the infrared effect at night. Due to the presence of visible light and infrared light at night, the automatic focusing problem of the movement at night is very prominent. Breaking through this technical problem will bring a qualitative improvement to the monitoring effect at night.

As far as the characteristics of high-definition dome cameras are concerned, Suzhou Keda Liu Zhiqiang believes that since high-definition high-speed domes are generally installed outdoors, compared with indoor units, later maintenance is difficult. At the same time, due to the harsh outdoor environment, it also puts forward high requirements for the reliability of the ball machine products. These two points still have a lot of room for improvement at this stage. In addition, the current high-definition movement on the market is a maximum of 30 times optical zoom. If a larger lens is required, it presents new challenges to the internal structure of the ball machine.

Development trend: technology integration and interconnection

From a general perspective, high-definition network, intelligence and rapid integration of technologies are the mainstream development trend of high-speed dome in the future. Hikvision technical support engineer Li Yiyuan said that the future development of high-speed dome will support the interconnection and interoperability between multiple manufacturers and multiple platforms by supporting the GB / T28181 access standard and network standard protocols Onvif, PSIA, and CGI; by supporting higher Clarity, higher magnification and higher frame rate to obtain better quality images; through the integration of intelligent functions, from passive monitoring to active monitoring; through the integration of technologies such as license plate recognition and flash synchronization, improve road security Monitored night effects and effective video utilization.

The Chinese market is different from the international market. At present, domestic end users pay more attention to the effect of infrared night market, while the international market pays more attention to night color low illumination. Therefore, the future development of high-definition high-speed domes still depends on whether they can innovate differentiated functions to ensure market share. Therefore, some industry-specific domes derived from special industry applications are also the development trend of high-definition high-speed domes in the future.

In addition, high-definition high-speed domes have PTZ functions compared to fixed IPCs. These functions will greatly reduce the number of cameras deployed, thereby reducing cost consumption and making operation more convenient. Therefore, the demand for dome cameras will continue to grow rapidly in the future. An important factor conducive to the development of high-speed domes is that the price of traditional analog domes is much higher than similar fixed cameras, and the positioning is higher. As the cost of high-definition high-speed domes decreases, in the future, high-speed high-speed domes will replace analog domes at the same time, and will also partially replace fixed cameras, such as guns, hemispheres, etc. A good choice. At present, the 3D control technology and virtual PTZ technology appearing on the high-speed ball market are the upgraded applications of PTZ technology. Its ultimate purpose is to make it easier to use.

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