High-speed ball is an intelligent camera front end, full name is high-speed intelligent dome camera, or integrated high-speed ball smart ball, or simply referred to as fastball, referred to as high-speed ball. High speed dome is the most sophisticated camera front end with the most complex and comprehensive monitoring system. High-speed ball is one of the important family members of the security monitoring family. Its role in monitoring systems cannot be ignored. It is applicable to the monitoring of large areas and activity targets in all walks of life. Such as intelligent building monitoring, bank security, urban road monitoring, power sector, airports, station monitoring.
The high-speed ball has a higher gold content than an ordinary surveillance camera and is used in more complicated environments. However, there are many misunderstandings in people's understanding of fastball. One of them is that high-speed high-speed ball is the main reference requirement for high-speed ball, but everyone knows that the low speed of high-speed ball is also quite critical. The low-speed drive control and core algorithm of the motor has a very high ball. With the development of networking, high-definition, and intelligent, the high-speed ball also develops more branches with the times, and various functions are Meet the monitoring needs of more complex environments.
Network high speed ball requires high network transmission
Because of the popularity of the current network HD in the market, and the simplicity of network monitoring in engineering construction and high-definition solutions, reliability is even better. Has been buoyed by the market. However, the network video surveillance system has high requirements for network transmission, and various video transmission options also require careful consideration. How to transmit data more smoothly in a limited network bandwidth is the most important issue that needs to be solved in the development process of the network high speed dome. H.264 standard makes moving picture compression technology rise to a higher stage, and now H.264 compression coding method has become the mainstream, providing high quality image transmission at lower bandwidth, under the same image quality conditions, H The data compression ratio of .264 is 1.5 times that of MPEG-4. In addition, the proposed dual-stream concept breaks through the bottleneck of network transmission and decoding resources. Dual stream is encoded in two formats at the encoding end, which places high requirements on hardware systems and software operating systems including chips. There are two kinds of dual-stream solutions. One is to use a higher-frequency chip for encoding and compression processing, usually at least to 500M. This has the advantage of a correspondingly lower cost; the other is the use of two chips. A chip completes a code stream, which can achieve higher stability. Traditional dual-stream refers to the use of a high bit rate for local high-definition storage, such as D1 encoding, and another low bit rate stream for network transmission, such as CIF encoding, taking into account local storage and remote network transmission. Currently, the widening application of dual stream can implement any code stream format selection coding, that is, when the code stream no longer specifies the code stream, the code stream can be selected in real time for encoding, not only realizing the dual stream transmission and storage, but also achieving Real-time compression and coexistence of arbitrary selection stream. Dual code stream is separately coded and stored separately. According to the network bandwidth, the code stream size can be flexibly selected to make this HD storage and low code stream transmission possible. Under the current state of bandwidth bottlenecks and market demand, dual stream technology There will be and continue to develop.
Night vision high-speed ball development bottlenecks
The high crime rate at night makes the high-speed ball with night vision function active, which is the perfect combination of infrared technology and high-speed ball. Infrared technology gives enough support to this new force. In general, there are two ways to achieve infrared technology: active and passive. In active infrared, infrared light emitting devices actively emit infrared light beam to illuminate the target, and then the infrared light reflected by the target object is reflected by the camera and imaged. The passive infrared light does not emit infrared light, and a "thermal image" is formed by detecting the infrared radiation of the target object itself.
The active infrared night vision high-speed ball consists of infrared LED and high-speed ball. The emergence of this combination overcomes the disadvantages of the infrared camera not having rotation and the lack of active emission of the infrared beam by the ordinary high-speed ball. However, this combination also has a development bottleneck:
Picture quality: The night vision picture has a flashlight effect, that is, the middle bright and dark corners. In the middle of the picture, there are phenomena such as flooding and halo affecting the image quality.
Infrared light beam's effective radiation distance: due to the scattering of the infrared light beam, objects within the effective distance will be clearly visible;
Life of infrared light emitting devices;
Energy-saving and heat-dissipation: The power of the infrared light-emitting device is large (a large amount of energy is consumed); the heat-dissipation amount is also large, and poor handling may affect the entire system;
Active IR "reflection limit": Only objects that are within the range of the infrared light beam, and that have no light-absorbing material or light-absorbing material on the surface, will reflect infrared light, subject to "reflection limits" during monitoring.
Based on the above-mentioned defects of active infrared, passive infrared technology has been adopted by the high-speed ball family. The combination of passive infrared imaging technology and high-speed ball realizes the monitoring under no light conditions. This combination effectively overcomes the defects of active infrared technology:
Picture Quality: The infrared energy (heat) is converted into an electrical signal through an infrared detection four-plane array, and then a thermal image is generated on the monitor, and the temperature value can be displayed;
Detection distance: The maximum detection distance can reach more than 2km (the infrared ray emitting equipment has the highest infrared efficiency only 25%);
Energy-saving and heat-dissipation: The power of infrared thermal imager for high-speed ball is less than 2W (the power of 100m visible distance infrared light-emitting device is about 30W, and even larger); In addition, the focal plane of infrared thermal imager for high-speed ball is used The combination of circuitry on the array and non-uniform compensation may not require a thermoelectric cooler;
Lux monitoring: not subject to "reflection restrictions", after all, all objects whose absolute temperature is greater than zero K (-273 degrees Celsius) radiate infrared light;
Harsh environmental monitoring: Infrared rays in the atmospheric window region with a wavelength of 8-14 microns can penetrate fog, haze and turbid air, smoke, and snow, enabling monitoring in various harsh environments.
It can be seen that passive infrared technology can overcome almost all technical defects of active infrared technology, but it is not perfect. The development of passive infrared technology and high-speed ball combination is still restricted. Since the infrared light is located in the spectrum at a wavelength of 0.78 to 1000 μm, the 2.0 to 1000 μm section is called thermal infrared. It must match the transmission spectral characteristics of the material and cannot pass through the spherical under cover of materials such as polycarbonate. Can pass some infrared materials, such as single crystal germanium. Not only that, but infrared materials made of tantalum are expensive, and infrared materials made of silicon are relatively cheaper, but the transmittance is lower than tantalum materials. These factors have hindered the development of outdoor infrared high-speed ball.
In addition to the use of conventional infrared diodes as a supplemental light device, night vision high-speed domes use a conventional infrared diode as a fill-to-light PTZ camera, which has a farther and more stable irradiation distance. Such as Guangzhou Li Ling Electronics Co., Ltd. 7640 series of intelligent high-speed PTZ camera, surveillance angle than the traditional high-speed ball more widely, you can do all-round monitoring without dead ends.
High-speed ball intelligence
The intelligent high-speed ball that can automatically track and perform corresponding alarm functions through behavior analysis has always been an important symbol of high-speed ball intelligence, and is a combination of high-speed ball and video processing technology (algorithms). Early auto-tracking and behavior analysis are based on the PC's reading and processing of video. With the development of DSP processor technology, high-speed ball products with intelligent analysis have been common.
The combination of high-speed ball and wireless transmission technology
The combination of high-speed ball and wireless transmission technology can be applied to the emergency command of public emergencies. The occurrence of emergencies is unpredictable, such as the ice disaster in southern China this year, the earthquake in Sichuan Province and other natural disasters, as well as some special production sites such as mines, seas, and tourist attractions, etc. If there are unexpected events in these areas When there is no obstruction to the use of monitoring equipment or the existing monitoring equipment originally used on the site, some emergency command platform systems need to be established. It is in response to this market demand that a wireless transmission high-speed ball is born.
The network HD system is still the focus of the future surveillance market. As a node in video surveillance, high-speed ball is very important. In addition to focusing on the internal circuit control of the high-speed ball, the micro-video processing chip solution, its own physical structure design can not be ignored. Only the monitoring system nodes can play their due functions. We talk about the monitoring system and have practical significance.
The high-speed ball has a higher gold content than an ordinary surveillance camera and is used in more complicated environments. However, there are many misunderstandings in people's understanding of fastball. One of them is that high-speed high-speed ball is the main reference requirement for high-speed ball, but everyone knows that the low speed of high-speed ball is also quite critical. The low-speed drive control and core algorithm of the motor has a very high ball. With the development of networking, high-definition, and intelligent, the high-speed ball also develops more branches with the times, and various functions are Meet the monitoring needs of more complex environments.
Network high speed ball requires high network transmission
Because of the popularity of the current network HD in the market, and the simplicity of network monitoring in engineering construction and high-definition solutions, reliability is even better. Has been buoyed by the market. However, the network video surveillance system has high requirements for network transmission, and various video transmission options also require careful consideration. How to transmit data more smoothly in a limited network bandwidth is the most important issue that needs to be solved in the development process of the network high speed dome. H.264 standard makes moving picture compression technology rise to a higher stage, and now H.264 compression coding method has become the mainstream, providing high quality image transmission at lower bandwidth, under the same image quality conditions, H The data compression ratio of .264 is 1.5 times that of MPEG-4. In addition, the proposed dual-stream concept breaks through the bottleneck of network transmission and decoding resources. Dual stream is encoded in two formats at the encoding end, which places high requirements on hardware systems and software operating systems including chips. There are two kinds of dual-stream solutions. One is to use a higher-frequency chip for encoding and compression processing, usually at least to 500M. This has the advantage of a correspondingly lower cost; the other is the use of two chips. A chip completes a code stream, which can achieve higher stability. Traditional dual-stream refers to the use of a high bit rate for local high-definition storage, such as D1 encoding, and another low bit rate stream for network transmission, such as CIF encoding, taking into account local storage and remote network transmission. Currently, the widening application of dual stream can implement any code stream format selection coding, that is, when the code stream no longer specifies the code stream, the code stream can be selected in real time for encoding, not only realizing the dual stream transmission and storage, but also achieving Real-time compression and coexistence of arbitrary selection stream. Dual code stream is separately coded and stored separately. According to the network bandwidth, the code stream size can be flexibly selected to make this HD storage and low code stream transmission possible. Under the current state of bandwidth bottlenecks and market demand, dual stream technology There will be and continue to develop.
Night vision high-speed ball development bottlenecks
The high crime rate at night makes the high-speed ball with night vision function active, which is the perfect combination of infrared technology and high-speed ball. Infrared technology gives enough support to this new force. In general, there are two ways to achieve infrared technology: active and passive. In active infrared, infrared light emitting devices actively emit infrared light beam to illuminate the target, and then the infrared light reflected by the target object is reflected by the camera and imaged. The passive infrared light does not emit infrared light, and a "thermal image" is formed by detecting the infrared radiation of the target object itself.
The active infrared night vision high-speed ball consists of infrared LED and high-speed ball. The emergence of this combination overcomes the disadvantages of the infrared camera not having rotation and the lack of active emission of the infrared beam by the ordinary high-speed ball. However, this combination also has a development bottleneck:
Picture quality: The night vision picture has a flashlight effect, that is, the middle bright and dark corners. In the middle of the picture, there are phenomena such as flooding and halo affecting the image quality.
Infrared light beam's effective radiation distance: due to the scattering of the infrared light beam, objects within the effective distance will be clearly visible;
Life of infrared light emitting devices;
Energy-saving and heat-dissipation: The power of the infrared light-emitting device is large (a large amount of energy is consumed); the heat-dissipation amount is also large, and poor handling may affect the entire system;
Active IR "reflection limit": Only objects that are within the range of the infrared light beam, and that have no light-absorbing material or light-absorbing material on the surface, will reflect infrared light, subject to "reflection limits" during monitoring.
Based on the above-mentioned defects of active infrared, passive infrared technology has been adopted by the high-speed ball family. The combination of passive infrared imaging technology and high-speed ball realizes the monitoring under no light conditions. This combination effectively overcomes the defects of active infrared technology:
Picture Quality: The infrared energy (heat) is converted into an electrical signal through an infrared detection four-plane array, and then a thermal image is generated on the monitor, and the temperature value can be displayed;
Detection distance: The maximum detection distance can reach more than 2km (the infrared ray emitting equipment has the highest infrared efficiency only 25%);
Energy-saving and heat-dissipation: The power of infrared thermal imager for high-speed ball is less than 2W (the power of 100m visible distance infrared light-emitting device is about 30W, and even larger); In addition, the focal plane of infrared thermal imager for high-speed ball is used The combination of circuitry on the array and non-uniform compensation may not require a thermoelectric cooler;
Lux monitoring: not subject to "reflection restrictions", after all, all objects whose absolute temperature is greater than zero K (-273 degrees Celsius) radiate infrared light;
Harsh environmental monitoring: Infrared rays in the atmospheric window region with a wavelength of 8-14 microns can penetrate fog, haze and turbid air, smoke, and snow, enabling monitoring in various harsh environments.
It can be seen that passive infrared technology can overcome almost all technical defects of active infrared technology, but it is not perfect. The development of passive infrared technology and high-speed ball combination is still restricted. Since the infrared light is located in the spectrum at a wavelength of 0.78 to 1000 μm, the 2.0 to 1000 μm section is called thermal infrared. It must match the transmission spectral characteristics of the material and cannot pass through the spherical under cover of materials such as polycarbonate. Can pass some infrared materials, such as single crystal germanium. Not only that, but infrared materials made of tantalum are expensive, and infrared materials made of silicon are relatively cheaper, but the transmittance is lower than tantalum materials. These factors have hindered the development of outdoor infrared high-speed ball.
In addition to the use of conventional infrared diodes as a supplemental light device, night vision high-speed domes use a conventional infrared diode as a fill-to-light PTZ camera, which has a farther and more stable irradiation distance. Such as Guangzhou Li Ling Electronics Co., Ltd. 7640 series of intelligent high-speed PTZ camera, surveillance angle than the traditional high-speed ball more widely, you can do all-round monitoring without dead ends.
High-speed ball intelligence
The intelligent high-speed ball that can automatically track and perform corresponding alarm functions through behavior analysis has always been an important symbol of high-speed ball intelligence, and is a combination of high-speed ball and video processing technology (algorithms). Early auto-tracking and behavior analysis are based on the PC's reading and processing of video. With the development of DSP processor technology, high-speed ball products with intelligent analysis have been common.
The combination of high-speed ball and wireless transmission technology
The combination of high-speed ball and wireless transmission technology can be applied to the emergency command of public emergencies. The occurrence of emergencies is unpredictable, such as the ice disaster in southern China this year, the earthquake in Sichuan Province and other natural disasters, as well as some special production sites such as mines, seas, and tourist attractions, etc. If there are unexpected events in these areas When there is no obstruction to the use of monitoring equipment or the existing monitoring equipment originally used on the site, some emergency command platform systems need to be established. It is in response to this market demand that a wireless transmission high-speed ball is born.
The network HD system is still the focus of the future surveillance market. As a node in video surveillance, high-speed ball is very important. In addition to focusing on the internal circuit control of the high-speed ball, the micro-video processing chip solution, its own physical structure design can not be ignored. Only the monitoring system nodes can play their due functions. We talk about the monitoring system and have practical significance.
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