The smart dome camera is a representative of the development of modern television monitoring. It integrates functions such as color integrated cameras, heads, decoders, and protective covers. It is easy to install, simple to use but powerful, and is widely used in open area surveillance. It can be used on different occasions.
The so-called intelligence, the author's understanding lies in the outstanding performance of its function, its representatives are: prefabricated point and continuous rotation function. The preset point is the number that the user can advance the scene of the monitor picture. This number is the preset point. Regardless of whether the screen stays at any place, the scene will immediately appear on the monitor (display) without any complicated operation through the call of the preset point. Continuous rotation means that the pan-tilt rotation is no longer a left-to-right or right-to-left rotation, but can be continuous rotation in one direction, breaking the rotation range of the PTZ can only 0-355 degrees.
Integral front-end imaging devices that use a dome-shaped cover are generally called integrated smart dome cameras, which include built-in integrated cameras (including zoom lenses), PTZ structures, and decoders. It is small, beautiful appearance, powerful, easy to install, easy to use, easy to maintain and so on. It is also popularly called "fastball", "smart ball" or "ball machine."
Classification of smart dome cameras
(1) Based on the rotation speed of the pan tilt: including high-speed ball (0-360/S); medium-speed ball (0-60/S) and low-speed ball (0-30/S).
(2) Divided by use environment: Indoor smart dome camera and outdoor smart dome camera. Outdoor smart ball includes waterproof device and constant temperature device, mostly double-layered with heating and fan.
(3) Dividing by installation: lifting (hanging on the roof and ceiling through the bracket); side mounting (fixed on the wall or pole by bracket); embedding (opening directly in the ceiling without bracket).
According to the use of integrated camera can also be classified.
The general dome camera should have the following functions:
Preset or Preset The so-called preset function refers to that the intelligent dome camera can store related parameters such as the pan tilt angle, tilt angle and camera lens focal length in the current state to the memory, and can quickly call these parameters when needed. PTZ and camera adjust to this position.
Automatic cruising The so-called automatic cruising means that some preset points can be programmed into the automatic cruising queue in the required order through pre-programming. Only one external command is required to allow the dome camera to automatically follow the set preset point order. The basic concept of a dome camera (3/6)
Automatic scanning The so-called automatic scanning means that the left limit position and the right limit position are set in advance so that the camera can automatically scan back and forth between the left and right limits at a set speed level.
PATTERN or PATTERN The PATTERN function is a PATTERN recording function. The dome can continuously record the user's movement of the dome camera during a certain period of time and the operation of the lens. The operation command can be used to The recorded operation loops playback automatically. The industry also calls this self-learning or smart memory.
Automatic operation (AUTOPARKING)
The so-called auto-run function is when the user does not operate for a period of time (time can be freely set), the smart ball can automatically return to an important preset position preset by the user (that is, the so-called guard position) or execute. Some pre-set function: automatic scanning, pattern scanning or auto-cruise.
Focal length control Users can adjust the focal length by controlling the keyboard to obtain the desired panoramic image or close-up view.
The focus control system automatically focuses by default. When the lens is zoomed, the camera will automatically focus with the center of the subject's picture to maintain a clear image; in special cases, the user can manually focus to achieve the desired image effect.
Aperture control cameras have automatic backlight compensation. Under bright light background, brightness compensation is automatically performed for darker targets. Make daylight adjustments to bright backgrounds. Avoid a situation where the entire screen is bright due to high background brightness, and the target is not discernible due to darkness, thus achieving a clear view.
When automatically flipping the operator to operate the lens of the smart dome camera to the bottom (vertical), the dome camera lens will automatically flip 180°, and then turn upwards to directly view the scene on the back, so as to achieve a full 180° longitudinal continuity. Surveillance.
Focal length/speed auto matching When the operator manually controls the smart dome camera, if the focus distance is long, the high speed response of the dome camera makes it possible to move the screen quickly and cause the screen to be lost. Based on the consideration of human nature, it is required that the smart dome camera must automatically adjust the pan and tilt speed according to the distance of the focal length, which makes it easier to manually track the target operation during monitoring.
Other functional area display, privacy protection, white balance control, backlight compensation control, color/black and white conversion control.
What are the core components of the dome?
The integrated smart dome camera is a high-tech product involving optical, mechanical and electronic fields. Due to the current domestic optoelectronics, micro-motor manufacturing technologies and production processes, the three main components of the integrated smart dome camera (integrated cameras with built-in zoom lenses, brushes, and high-performance motors) are almost all dependent on imports.
The integrated camera integrated smart dome camera serves as the front end device of the monitoring system. Whether the image is clear and whether the focus is accurate and rapid is an extremely critical indicator, and this depends on the first key component selected by the product, the integrated camera.
Currently, the all-in-one camera brands approved by dome makers worldwide are Hitachi, Sony and Sanyo. The integrated cameras of these first-class brands are known for their positive color, sensitive focus, stable quality and long service life (more than 1 million times). The display resolution is about 470 lines, which is the first choice for most famous brand manufacturers in the dome market. .
The second-tier integrated camera brand is based in South Korea: Samsung (SAMSUNG), Hienbi, and LG. Compared to the integrated camera of the first-class brand, these cameras basically have a certain color cast (or reddish or bluish), and the focusing speed is also about 20 to 50% slower than the former, but the quality is stable and the display is resolved. The rate is also about 470 lines, which is the main choice of Korean ball machine manufacturers, and is also the choice of domestic general ball machine manufacturers or counterfeit foreign brand ball machine manufacturers.
The concept of multiples of integrated cameras Some manufacturers in the market use the concept of camera zoom to mislead the user's choice. When they introduced the performance of the dome to the user, they only talked about how many times the camera was. It seemed that the bigger the bigger the better, without saying clearly how many times the optical zoom and the number of digital zoom products. In an actual image monitoring system, what really matters is the multiple of the optical zoom. Because the effective pixels of the current integrated camera are about 440K, if the electronic zoom exceeds 2 times, there is almost no use value, and its strong mosaic effect makes the actual monitoring image impossible to watch at all.
The dome structure and the core components Generally, the longer the focal length of the optical lens is, the larger the zoom factor is, and the farther the camera can monitor and see the target. However, due to the limitation of the current international technical level of the integrated camera zoom lens group, the telephoto of the zoom lens group has been fluctuating around the difficulty of 90mm. The general 16x optical zoom focal length range is: 4-64mm, 18x optical zoom focal length range is: 3.1-73.8mm, 22x optical zoom focal length range is: 4-88mm or 3.6-79.2mm, and 23 times is 3.6-82.8mm, 25 times is 2.5-62.5mm, 27 times is 3.25-87.75mm, it is not difficult to see from the above data that the telephoto 88mm of the 22x optical zoom lens group is the farthest, which is the current market is more popular 22x optical zoom integrated smart ball machine one of the reasons. When selecting the lens zoom factor, the user should ask the manufacturer to provide the specific lens near-focus, far-focus parameters instead of one-sided listening to the multiples of its advertising. The same 22x optical zoom, Hitachi HITACHI's integrated camera is the best, and it is not only the quality of the integration of Korean-made cameras, there are also great price differences. The Hitachi HITACHI integrated camera price is almost twice that of Korea.
The second key component of the brush integration dome camera is the brush. It is the guarantee that the integrated intelligent dome camera can transmit the video signal and control signal accurately while continuously rotating 360 degrees. In terms of stability and reliability, the U.S. brand is the best. Its internal brush uses a gold structure to ensure a lifetime of more than 10 million times. The brush developed by some domestic ball makers can not solve the problem of heat dissipation (using butter to dissipate heat, once the consumption of grease is completed, uneven heat dissipation will lead to brush damage) and wear resistance (according to the cost of raw materials And process limitations, without the use of gold materials, easily lead to the reliability of signal transmission is not guaranteed), the general life span is only a few hundred thousand times, which is a completely different order of magnitude than the 10 million times.
The third key component of the motor-integrated dome camera is the motor and its corresponding mechanical structure and control technology. This is the power source for driving horizontal and vertical movements of the integrated intelligent dome PTZ. The difficulties in dome design are also here. There are two major series of motors that are currently used in the industry: DC motors and stepper motors.
From the control point of view, the DC motor has almost no operating current in the motor coil when the dome motor is at rest. This kind of characteristic of the DC motor leads to almost no heat loss of the DC motor, and the life is relatively long, generally having a life of more than 10 years; if the DC motor is to be driven to rotate the PTZ, the dome machine must be calculated from the current position. Acceleration must also consider the deceleration at which the dome will stop at the next position. In addition, the output torque of the motor is also taken into account to ensure the smooth rotation of the dome and the design requirements of the controller are extremely high. At present, only a handful of manufacturers in the world have mastered the technology. Shenzhen AiLi Ke Electronics Co., Ltd. is one of them.
The working principle of the stepping motor stepper motor determines that it uses the pulse counting method to drive, belonging to the discrete control system. To control the dome camera to rotate from the current position to the next position, in the constant speed control mode, only the difference in the number of steps between two positions can be calculated. Relatively speaking, control is relatively simple. Currently widely used 1.8 degree or 0.9 degree mechanical step angle motor, as long as the step angle differential circuit (such as 16 differential, 32 differential, 64 differential or 128 differential) is designed, precise angle control can be performed. For a stepper motor with the same mechanical step angle, the higher the differential step number, the higher the control accuracy, and the greater the design difficulty of the differential circuit. However, it must be noted that because the stepper motor uses differential pulse technology to control the rotation angle and speed, even if the dome is in a stationary state, a certain operating current must be kept in the motor in order to maintain the current position of the motor. Therefore, there is a great heat loss in the stepper motor head, and the life of the motor is naturally affected. In general, the life of a stepper motor ball is only about 3 to 5 years. At present, the more common heat dissipation method is to increase the fan in the dome cover so as to form a good air circulation heat dissipation system in the dome cover. Although this method helps to improve the heat dissipation of the stepping motor to some extent, once the fan fails, due to the sealed structure design of the dome cover, the dome may be damaged due to local overheating. Users of PELCO domes may have a deep understanding of this.
The future development trend of the dome camera is the trend of digitization, intelligence and network development in the entire monitoring industry. The integration of intelligent dome cameras is no exception. From the current situation of the dome camera industry, there are the following trends:
1) Internet fastball (IP dome) supporting network transmission and network control
2) Directly support twisted pair transmission or optical fiber transmission, which is more suitable for future intelligent building and ITS intelligent transportation applications
3) More intelligent and humanized in function, such as adding facial image recognition and automatic tracking, can be applied to monitoring and hunting fugitives in public places; for example, adding automatic voice positioning can be applied to video conference systems.
4) In appearance design, with the increase of integration, miniaturization and diversified appearance design will make the installation of the dome camera more convenient, and the use environment will be more inconspicuous with the use of the environment. In terms of indicators, the integrated camera generally uses 1/4′′ CCD, the near-end focal length is 3-4mm, and the remote focal length is about 90mm, although the multiple is large (at present, most products are more than 22 times), the observable distance It may not be as far as it is supposed to be. It is not like the ordinary 1/3′′ 11-110mm ten times lens, which is ten times bigger. You can look at the distant objects and the effect is similar to the 27 times integrated camera. Therefore, you should pay attention when purchasing. In addition, because the matching lens uses 1/4′′ specifications, the amount of light passing through will be smaller and the sensitivity will be reduced. This should also be considered.
In terms of function, the following points are mainly considered: whether there is day and night conversion, whether there is infrared sensing; what the operating voltage is, how much power is, which is related to the decoder, and can not be careless; whether there is real backlight compensation, this problem sounds ridiculous Actually, some manufacturers do not know what to consider, the backlight compensation is simply to increase the image brightness, the result is not as good as 90% of the circumstances do not turn on the backlight compensation function, which can only be found through testing, the manual can not tell you In addition, some integrated cameras may experience severe color shifts at 4 or 5 pm, possibly due to poor handling of filters or lenses, which must also be tested.
Since the integrated camera is widely used on a uniform ball, its interface mode is very important. Some integrated cameras use a single plug and play excuse, and the interface connection is hard. As a result, when the camera rotates in the ball, power failure or out-of-control failures constantly occur, and such failures are difficult to solve. Therefore, it is better to use a crimped interface. Of course, when used in a general protective cover, there is no appeal because the camera is fixed relative to the protective cover.
In addition, most integrated cameras have camera communication interfaces. There are also 485 and 232. Since most of these interfaces are multiplexed with the lens control terminal, you have to determine how to implement the port function conversion because some integration The conversion of the camera's console is implemented using the time it takes to control the lens. If this type of camera is installed, it must explain this to the user. Otherwise, once the control takes too long, it will pop out of the menu, confusing the user. .
Pay attention to the video format problem. Perhaps the reason for the instability of the supply of integrated camera movements is that the NTSC system may appear in the integrated camera provided by each manufacturer. This problem is often not easy to find because the current monitors are compatible with multiple standards, PAL and NTSC. The above images are all displayed well. However, once the camera is connected to a hard disk recorder or video server, the problem arises. If the hard disk recorder or video server has a "determined" system setting function, otherwise you have to see Strange images too.
The so-called intelligence, the author's understanding lies in the outstanding performance of its function, its representatives are: prefabricated point and continuous rotation function. The preset point is the number that the user can advance the scene of the monitor picture. This number is the preset point. Regardless of whether the screen stays at any place, the scene will immediately appear on the monitor (display) without any complicated operation through the call of the preset point. Continuous rotation means that the pan-tilt rotation is no longer a left-to-right or right-to-left rotation, but can be continuous rotation in one direction, breaking the rotation range of the PTZ can only 0-355 degrees.
Integral front-end imaging devices that use a dome-shaped cover are generally called integrated smart dome cameras, which include built-in integrated cameras (including zoom lenses), PTZ structures, and decoders. It is small, beautiful appearance, powerful, easy to install, easy to use, easy to maintain and so on. It is also popularly called "fastball", "smart ball" or "ball machine."
Classification of smart dome cameras
(1) Based on the rotation speed of the pan tilt: including high-speed ball (0-360/S); medium-speed ball (0-60/S) and low-speed ball (0-30/S).
(2) Divided by use environment: Indoor smart dome camera and outdoor smart dome camera. Outdoor smart ball includes waterproof device and constant temperature device, mostly double-layered with heating and fan.
(3) Dividing by installation: lifting (hanging on the roof and ceiling through the bracket); side mounting (fixed on the wall or pole by bracket); embedding (opening directly in the ceiling without bracket).
According to the use of integrated camera can also be classified.
The general dome camera should have the following functions:
Preset or Preset The so-called preset function refers to that the intelligent dome camera can store related parameters such as the pan tilt angle, tilt angle and camera lens focal length in the current state to the memory, and can quickly call these parameters when needed. PTZ and camera adjust to this position.
Automatic cruising The so-called automatic cruising means that some preset points can be programmed into the automatic cruising queue in the required order through pre-programming. Only one external command is required to allow the dome camera to automatically follow the set preset point order. The basic concept of a dome camera (3/6)
Automatic scanning The so-called automatic scanning means that the left limit position and the right limit position are set in advance so that the camera can automatically scan back and forth between the left and right limits at a set speed level.
PATTERN or PATTERN The PATTERN function is a PATTERN recording function. The dome can continuously record the user's movement of the dome camera during a certain period of time and the operation of the lens. The operation command can be used to The recorded operation loops playback automatically. The industry also calls this self-learning or smart memory.
Automatic operation (AUTOPARKING)
The so-called auto-run function is when the user does not operate for a period of time (time can be freely set), the smart ball can automatically return to an important preset position preset by the user (that is, the so-called guard position) or execute. Some pre-set function: automatic scanning, pattern scanning or auto-cruise.
Focal length control Users can adjust the focal length by controlling the keyboard to obtain the desired panoramic image or close-up view.
The focus control system automatically focuses by default. When the lens is zoomed, the camera will automatically focus with the center of the subject's picture to maintain a clear image; in special cases, the user can manually focus to achieve the desired image effect.
Aperture control cameras have automatic backlight compensation. Under bright light background, brightness compensation is automatically performed for darker targets. Make daylight adjustments to bright backgrounds. Avoid a situation where the entire screen is bright due to high background brightness, and the target is not discernible due to darkness, thus achieving a clear view.
When automatically flipping the operator to operate the lens of the smart dome camera to the bottom (vertical), the dome camera lens will automatically flip 180°, and then turn upwards to directly view the scene on the back, so as to achieve a full 180° longitudinal continuity. Surveillance.
Focal length/speed auto matching When the operator manually controls the smart dome camera, if the focus distance is long, the high speed response of the dome camera makes it possible to move the screen quickly and cause the screen to be lost. Based on the consideration of human nature, it is required that the smart dome camera must automatically adjust the pan and tilt speed according to the distance of the focal length, which makes it easier to manually track the target operation during monitoring.
Other functional area display, privacy protection, white balance control, backlight compensation control, color/black and white conversion control.
What are the core components of the dome?
The integrated smart dome camera is a high-tech product involving optical, mechanical and electronic fields. Due to the current domestic optoelectronics, micro-motor manufacturing technologies and production processes, the three main components of the integrated smart dome camera (integrated cameras with built-in zoom lenses, brushes, and high-performance motors) are almost all dependent on imports.
The integrated camera integrated smart dome camera serves as the front end device of the monitoring system. Whether the image is clear and whether the focus is accurate and rapid is an extremely critical indicator, and this depends on the first key component selected by the product, the integrated camera.
Currently, the all-in-one camera brands approved by dome makers worldwide are Hitachi, Sony and Sanyo. The integrated cameras of these first-class brands are known for their positive color, sensitive focus, stable quality and long service life (more than 1 million times). The display resolution is about 470 lines, which is the first choice for most famous brand manufacturers in the dome market. .
The second-tier integrated camera brand is based in South Korea: Samsung (SAMSUNG), Hienbi, and LG. Compared to the integrated camera of the first-class brand, these cameras basically have a certain color cast (or reddish or bluish), and the focusing speed is also about 20 to 50% slower than the former, but the quality is stable and the display is resolved. The rate is also about 470 lines, which is the main choice of Korean ball machine manufacturers, and is also the choice of domestic general ball machine manufacturers or counterfeit foreign brand ball machine manufacturers.
The concept of multiples of integrated cameras Some manufacturers in the market use the concept of camera zoom to mislead the user's choice. When they introduced the performance of the dome to the user, they only talked about how many times the camera was. It seemed that the bigger the bigger the better, without saying clearly how many times the optical zoom and the number of digital zoom products. In an actual image monitoring system, what really matters is the multiple of the optical zoom. Because the effective pixels of the current integrated camera are about 440K, if the electronic zoom exceeds 2 times, there is almost no use value, and its strong mosaic effect makes the actual monitoring image impossible to watch at all.
The dome structure and the core components Generally, the longer the focal length of the optical lens is, the larger the zoom factor is, and the farther the camera can monitor and see the target. However, due to the limitation of the current international technical level of the integrated camera zoom lens group, the telephoto of the zoom lens group has been fluctuating around the difficulty of 90mm. The general 16x optical zoom focal length range is: 4-64mm, 18x optical zoom focal length range is: 3.1-73.8mm, 22x optical zoom focal length range is: 4-88mm or 3.6-79.2mm, and 23 times is 3.6-82.8mm, 25 times is 2.5-62.5mm, 27 times is 3.25-87.75mm, it is not difficult to see from the above data that the telephoto 88mm of the 22x optical zoom lens group is the farthest, which is the current market is more popular 22x optical zoom integrated smart ball machine one of the reasons. When selecting the lens zoom factor, the user should ask the manufacturer to provide the specific lens near-focus, far-focus parameters instead of one-sided listening to the multiples of its advertising. The same 22x optical zoom, Hitachi HITACHI's integrated camera is the best, and it is not only the quality of the integration of Korean-made cameras, there are also great price differences. The Hitachi HITACHI integrated camera price is almost twice that of Korea.
The second key component of the brush integration dome camera is the brush. It is the guarantee that the integrated intelligent dome camera can transmit the video signal and control signal accurately while continuously rotating 360 degrees. In terms of stability and reliability, the U.S. brand is the best. Its internal brush uses a gold structure to ensure a lifetime of more than 10 million times. The brush developed by some domestic ball makers can not solve the problem of heat dissipation (using butter to dissipate heat, once the consumption of grease is completed, uneven heat dissipation will lead to brush damage) and wear resistance (according to the cost of raw materials And process limitations, without the use of gold materials, easily lead to the reliability of signal transmission is not guaranteed), the general life span is only a few hundred thousand times, which is a completely different order of magnitude than the 10 million times.
The third key component of the motor-integrated dome camera is the motor and its corresponding mechanical structure and control technology. This is the power source for driving horizontal and vertical movements of the integrated intelligent dome PTZ. The difficulties in dome design are also here. There are two major series of motors that are currently used in the industry: DC motors and stepper motors.
From the control point of view, the DC motor has almost no operating current in the motor coil when the dome motor is at rest. This kind of characteristic of the DC motor leads to almost no heat loss of the DC motor, and the life is relatively long, generally having a life of more than 10 years; if the DC motor is to be driven to rotate the PTZ, the dome machine must be calculated from the current position. Acceleration must also consider the deceleration at which the dome will stop at the next position. In addition, the output torque of the motor is also taken into account to ensure the smooth rotation of the dome and the design requirements of the controller are extremely high. At present, only a handful of manufacturers in the world have mastered the technology. Shenzhen AiLi Ke Electronics Co., Ltd. is one of them.
The working principle of the stepping motor stepper motor determines that it uses the pulse counting method to drive, belonging to the discrete control system. To control the dome camera to rotate from the current position to the next position, in the constant speed control mode, only the difference in the number of steps between two positions can be calculated. Relatively speaking, control is relatively simple. Currently widely used 1.8 degree or 0.9 degree mechanical step angle motor, as long as the step angle differential circuit (such as 16 differential, 32 differential, 64 differential or 128 differential) is designed, precise angle control can be performed. For a stepper motor with the same mechanical step angle, the higher the differential step number, the higher the control accuracy, and the greater the design difficulty of the differential circuit. However, it must be noted that because the stepper motor uses differential pulse technology to control the rotation angle and speed, even if the dome is in a stationary state, a certain operating current must be kept in the motor in order to maintain the current position of the motor. Therefore, there is a great heat loss in the stepper motor head, and the life of the motor is naturally affected. In general, the life of a stepper motor ball is only about 3 to 5 years. At present, the more common heat dissipation method is to increase the fan in the dome cover so as to form a good air circulation heat dissipation system in the dome cover. Although this method helps to improve the heat dissipation of the stepping motor to some extent, once the fan fails, due to the sealed structure design of the dome cover, the dome may be damaged due to local overheating. Users of PELCO domes may have a deep understanding of this.
The future development trend of the dome camera is the trend of digitization, intelligence and network development in the entire monitoring industry. The integration of intelligent dome cameras is no exception. From the current situation of the dome camera industry, there are the following trends:
1) Internet fastball (IP dome) supporting network transmission and network control
2) Directly support twisted pair transmission or optical fiber transmission, which is more suitable for future intelligent building and ITS intelligent transportation applications
3) More intelligent and humanized in function, such as adding facial image recognition and automatic tracking, can be applied to monitoring and hunting fugitives in public places; for example, adding automatic voice positioning can be applied to video conference systems.
4) In appearance design, with the increase of integration, miniaturization and diversified appearance design will make the installation of the dome camera more convenient, and the use environment will be more inconspicuous with the use of the environment. In terms of indicators, the integrated camera generally uses 1/4′′ CCD, the near-end focal length is 3-4mm, and the remote focal length is about 90mm, although the multiple is large (at present, most products are more than 22 times), the observable distance It may not be as far as it is supposed to be. It is not like the ordinary 1/3′′ 11-110mm ten times lens, which is ten times bigger. You can look at the distant objects and the effect is similar to the 27 times integrated camera. Therefore, you should pay attention when purchasing. In addition, because the matching lens uses 1/4′′ specifications, the amount of light passing through will be smaller and the sensitivity will be reduced. This should also be considered.
In terms of function, the following points are mainly considered: whether there is day and night conversion, whether there is infrared sensing; what the operating voltage is, how much power is, which is related to the decoder, and can not be careless; whether there is real backlight compensation, this problem sounds ridiculous Actually, some manufacturers do not know what to consider, the backlight compensation is simply to increase the image brightness, the result is not as good as 90% of the circumstances do not turn on the backlight compensation function, which can only be found through testing, the manual can not tell you In addition, some integrated cameras may experience severe color shifts at 4 or 5 pm, possibly due to poor handling of filters or lenses, which must also be tested.
Since the integrated camera is widely used on a uniform ball, its interface mode is very important. Some integrated cameras use a single plug and play excuse, and the interface connection is hard. As a result, when the camera rotates in the ball, power failure or out-of-control failures constantly occur, and such failures are difficult to solve. Therefore, it is better to use a crimped interface. Of course, when used in a general protective cover, there is no appeal because the camera is fixed relative to the protective cover.
In addition, most integrated cameras have camera communication interfaces. There are also 485 and 232. Since most of these interfaces are multiplexed with the lens control terminal, you have to determine how to implement the port function conversion because some integration The conversion of the camera's console is implemented using the time it takes to control the lens. If this type of camera is installed, it must explain this to the user. Otherwise, once the control takes too long, it will pop out of the menu, confusing the user. .
Pay attention to the video format problem. Perhaps the reason for the instability of the supply of integrated camera movements is that the NTSC system may appear in the integrated camera provided by each manufacturer. This problem is often not easy to find because the current monitors are compatible with multiple standards, PAL and NTSC. The above images are all displayed well. However, once the camera is connected to a hard disk recorder or video server, the problem arises. If the hard disk recorder or video server has a "determined" system setting function, otherwise you have to see Strange images too.
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