Tag: IP/HD-SDI high speed ball technology
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HD network speed dome technology analysis
The high-definition network high-speed ball is developed on the basis of the traditional analog high-speed ball. On the basis of it, adding a high-definition integrated movement, an audio-video coding module, and a network access module can form a basic network-type high-speed ball. Realize high-definition video and audio data and control data to be reliably transmitted through the network. How to transmit data more smoothly in a high-definition network high-speed ball under a limited network bandwidth is the primary problem that manufacturers need to solve. The compression coding of H.264 has gradually become the mainstream, providing high-quality image transmission at a lower bandwidth. Under the same image quality conditions, the data compression ratio of H.264 is 1.5 times that of MPEG-4. However, network latency is also an important consideration because of network transmission.
The high-speed ball first needs to pay attention to the high-speed running performance, and secondly, it needs to pay great attention to the key indicator of the low-speed running performance of the ball machine. For example, high-definition high-speed ball products of some mainstream manufacturers at home and abroad have made in-depth research on stepping motor subdivision technology, with a manual minimum speed of 0.01 degrees/second, preset speed of up to 300 degrees/second, and in addition to stepless speed change, humanity. Technology such as zoom/speed automatic matching achieves good low-speed stability and high-speed accuracy, ensuring a good visual experience for customers when performing proportional zoom operations and preset position settings.
At present, mainstream HD high-speed ball products can provide rich and diverse functions, such as front-end audio input, audio output, alarm linkage, video occlusion, video motion alarm, cruise scanning, pattern scanning, watch position, system restart, movement parameter setting. Other functions, in addition to some technically strong manufacturers have also developed some features, such as OSD menu, 3D positioning and other functions. The product line is becoming more and more abundant. From the point of view of pixels, there are currently 1.3 million, 2 million, and 3 million pixels. From the sensor type, there are CMOS, CCD, and the latest Exmor CMOS. From the product form, there is a common high-speed ball. , infrared high-speed ball, laser high-speed ball, etc.; from the perspective of optical performance, there are 18X, 20X, 28X and so on.
HD-SDI HD high speed dome technology analysis
When the HD-SDI high-speed ball was first introduced to the market, it often appeared that the transmission distance was too short. If the HDMI is only a few tens of meters, even a coaxial cable can only reach 100 meters. But the good news is that manufacturers have begun to pay attention to the transmission distance problem. At present, HD-SDI is converted to fiber-optic cable transmission through the optical transceiver of Fiber, and in order to meet the one-way or two-way transmission of multi-channel HD-SDI signals. . Optical transceivers also have multi-channel optical wavelength division methods such as WDM/DWDM/CWDM, which achieves more than one HD-SDI fiber-optic signal transmission and transmission requirements, allowing HD-SDI camera signal transmission to reach 30-70 kilometers.
For the control part of the dome camera, since the HD-SDI cannot control and transmit the sound signal, if the cable is separately routed, it will definitely affect the convenience of construction. If the PTZ control signal and the audio signal are simultaneously transmitted in the coaxial, due to the various manufacturers The standards of the development protocol are not uniform, and it is easy to cause compatibility problems. At present, under the carrier (CarriesWave) technology of transmitting signals by coaxial, it is possible to embed such a similar 16/32 bit single coaxial transmission in the useless part of the signal. The way to transmit control and sound signals. This opened the way for the development of HD-SDI, and the traditional matrix system has a chance to recover from the high-definition gap.
At present, the monitoring system image is presented in the CVBS analog signal input and VGA or HDMI terminal display. The high-definition 720P/1080P is the main display format. At the same time, under the digital TV HDTVSMPTE-296M/274M, the input format is mostly For HDMI or DVI and YC signal interface formats, most display manufacturers are identified by the HDMI interface of HD-SDI HD, but BNC is the best choice compared to SDI's signal interface format. Although most LCD monitors can support HDMI-1080P, the interface format with embedded SDI receiver chip and SDI can only find the small-size display and large screen. This is also a problem with HD-SDI development.
HD-SDI cameras currently lack systematic management platform tools, and encounter great problems in integration and centralized management. In terms of storage, because they cannot store network architecture like network cameras, there is a “can’t seeâ€. problem. However, influenced by the HybridDVR concept and the emergence of SDI-DVR, such problems no longer plague engineers who want to use HD-SDI cameras, because HD-SDI storage requirements are equivalent to HD-SDI monitoring, and HD- SDI has the advantage of ensuring clear and real-time recording, and in terms of capacity, the storage space occupied by HD-SDI and network camera is almost the same.
New technology application requirements
With the popularization of the concept of Internet of Things and the diversification of mobile terminals such as mobile phones, more and more high-end users are increasingly using the mobile terminals such as the iPhone/iPad to view and control the high-speed high-speed ball anytime and anywhere. At present, most manufacturers' HD high-speed dome products can monitor video and other basic functions in real time through mobile terminals, but some advanced operations cannot be fully realized. However, a few manufacturers of high-speed high-speed ball products currently have high-speed ball control through mobile terminals such as 3D positioning, preset position call, alarm, capture and other functions.
HD high-speed ball applications are usually installed outdoors, so night vision capability has become a very important demand in the market. The current night vision function of HD high-speed dome is usually realized by active infrared, using infrared light to fill light at night. High-definition monitoring in low light conditions. The distance of the night vision distance, the way the infrared light is turned on, the material of the infrared light directly affects the effect of night vision.
For an excellent high-definition high-speed ball, in addition to the need to consider functionality in the market, more important is the ease of use. For example, the unique magnetic adsorption type movement quick-release structure is adopted. After fixing the outer cover during engineering installation, the movement can be directly aligned with the positioning hole, and it is not required to be rotated or fixed by screws, and the installation is very fast. And solid. The integrated installation method, the movement, the fan, the circuit board, etc. are layered and assembled, which is conducive to the formation of air convection inside and outside the gallbladder, and can effectively disperse the heat inside the fuselage.
Future development needs to break through the bottleneck
Although the high-speed high-speed ball technology of IP/HD-SDI has been greatly developed, there are still some areas to be improved and improved in practical applications. The high-speed high-speed ball is affected by the current international technical level due to the integrated camera zoom lens group. Restricted, the far focus of the zoom lens group has been around 95mm. Generally, the focal length of the 16x optical zoom is 4-64mm; the focal length of the 18x optical zoom is 3.1-73.8mm; the focal length of the 20x optical zoom is 4.7-94mm. From the above data, it is not difficult to see that the far-focus 94mm of the 20x optical zoom lens group is the farthest, and the 20X optical zoom, 1080P full-real-time resolution high-definition high-speed ball products are also the mainstream in the current market.
In addition to considering nighttime monitoring, the market also places high demands on night vision distance. However, most manufacturers do not have infrared high-speed high-speed ball products at present, and only a few manufacturers with strong R&D strengths already have related high-definition infrared ball products.
With the maturity and improvement of technologies such as IP/HD-SDI, the future high-definition high-speed ball will make breakthroughs in the following aspects:
1, IP / HD-SDI high-definition high-speed ball and Internet of Things combination
With the successful application of the Internet of Things's radio frequency technology (RFID), seamless integration with HD video can be achieved in the future. The data transmitted from the radio frequency can be received through the 485 interface or the network port of the high-speed high-speed ball, so that the combination of the image and the radio frequency is achieved. For example, this technology can replace fixed punching, illegal personnel identification, etc., which helps to improve many of the more cumbersome work in practice, reflecting the value of high intelligence and high technology.
2, IP high-definition high-speed ball and alarm equipment linkage
Taking the high-definition high-speed ball as an example, there is an alarm (ALARMI/O) interface on the general ball machine. This alarm signal can handle the switch level. When the ball machine receives this data, it can encode it, and then Send to the TCP/IP network or pass, through the application software to perform various linkage response settings for the alarm signal, such as sound, light alarm and alarm recording.
3, IP high-speed high-speed ball combined with mobile devices
With the popularity of 3G technology and IP high-speed domes all have their own independent IP addresses, they can directly connect to mobile devices through 3G networks, and transmit high-definition images in real time to realize wireless HD video transmission. You can also configure the built-in E-mail, FTP and other clients in the IP HD dome. When accessing the Internet, the IP HD dome device can also capture the captured image when the alarm is triggered by E-mail or FTP. The video is sent to the mobile device. It can also be connected to the device of the SIM card that can be connected through the COM port, and sent to the designated mobile phone terminal by means of SMS or MMS. This enables real-time, intelligent monitoring and uses only a small amount of bandwidth and cost.
4, smart aspects cut into the high-definition ball machine
IP/HD-SDI HD domes provide high-definition images, which provide an innate advantage for improving the accuracy of intelligent analysis. By embedding intelligent algorithms through DSP or FPGA, the original image information output from the chip can be directly processed, and based on the original image, some suitable applications suitable for the feature occasions can be made. For example, you can embed the entrance and exit demographics. This function automatically analyzes the number of people or objects that pass through important entrances or exits or designated areas by analyzing the images monitored by the camera. And in the low-carbon era, the combination of intelligent algorithms and energy-saving and environmental protection has opened up another huge market. In party and government organs, schools, enterprises and large-scale home environments, intelligent video analysis technology can also be used to eliminate huge power waste and security risks, such as automatically turning off unnecessary lights or turning on lights for people working in office or adjusting the intensity of lights. Wait, in the future, the megapixel network high-speed ball will certainly develop towards high-definition, intelligent, and more product-rich forms.
Review
At present, the application of high-definition high-speed ball is only in some industry solutions. Due to price, technology, construction, cost and other reasons, in the traditional monitoring market, the high-speed high-speed ball has not been fully spread, the most important obstacle is transmission. The problem. At present, the transmission of IP high-definition surveillance is based on the network, but this transmission method has poor real-time performance, and the image is compressed, and the traditional analog upgrade HD needs to be completely re-engineered. The HD-SDI high-speed high-speed ball can only be realized through a fiber link, which is costly. In the future, only IP will achieve low-bandwidth and high-definition, HD-SDI transmission will achieve multiple channels, low-cost, high-definition high-speed ball will achieve greater development. High-definition and intelligentization are not only the development direction of the monitoring industry, but also the future trend of high-definition high-speed ball.
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