As the name suggests, day and night cameras are cameras that can be used day and night, or cameras that can output valid video signals during day and night.
Day and night camera purchase
Speaking of the selection of dual-use cameras for day and night, it is rather interesting to talk about many people's attitude toward it. There have been many opinions about dual-use cameras day and night. Some say that dual-use cameras are not practical and the color of the cameras is dark. It can be used as a monitor that users watch every day but they cannot turn black, but color monitors do. Where can black and white images go? Some say that for a color CCD, the natural resolution is lower than that of a black and white CCD of the same grade. With the same CCD, no matter how it is processed, it is impossible to achieve the black and white effect; Although the frame accumulation has improved some effects, it is still noisy at night, and the smearing of moving objects cannot be solved. It seems to be an itching issue to solve day and night problems. There are complaints from the large gap between the imagination of the project contractors and their own imagination. There are also manufacturers or sellers who make different interpretations of the day and night cameras on their own positions, making it difficult for the contractors who need to purchase products to be at a loss. "Ponies crossing the river."
With the continuous expansion of the day and night camera concept and the continuous innovation of related technologies and the ever-increasing levels of products, it is inevitable that such a situation is present. As a buyer, how to purchase a project that suits their engineering needs, and the cost performance is good Products are sometimes not easy.
First of all, to select a day/night camera must be equipped with technical personnel to fully understand the user's requirements and the actual needs of the project environment, to fully understand the exact meaning of the indicators in day and night cameras, this work is difficult to be "full "Two words, because day and night cameras are still changing, and new things will continue to emerge. If you don't "sufficiently", it's easy to have problems.
In addition, to select a brand with a larger product and a good service word of mouth, in general, the product with a large brand and the product data are more reliable in terms of performance, especially if the product is more systematic, even if new products are introduced. Series, there are also fewer "side effects"; service providers, well-known sellers will objectively introduce the advantages and disadvantages of certain products, allowing you to avoid detours in the purchase. Again, more than a few elections, repeated comparisons, in order to be aware of.
In the end, it must be seen as a fact. After repeated trials and trials, it can be purchased. Do not underestimate this point, but it is quite important. It is a magic weapon for many engineering companies. As far as day and night cameras are concerned, there are currently some products that are not mature enough to be pushed onto the market. As a result, they have disastrous consequences for contractors. , And this kind of immature, unstable, not through repeated and meticulous testing, simply can not be found, for example, there is a company's product color to black and white process is very good, the effect of day and night is also good, can be an infrared light If something goes wrong, it will constantly switch between color and black and white. For such products, no matter how manufacturers explain or make up for it, as a product that has already gone to market, from the producer to the user The interests of all parties have been damaged. Therefore, the engineering company must test and simulate on-site commissioning both before and after the procurement of the product.
Whether it is to adopt a filter-type filter or a filter-type improvement method, it is in favor of a hardware method or a software method. These two methods have their advantages and disadvantages. The hardware method is intuitive and has the advantages of simple implementation, but it has a lifetime problem, and Will be affected by the process and assembly, the cost of the product is also high, the software is low-cost, long life, but there are anti-jamming issues, and must consider whether the program is perfect, it is difficult to distinguish in engineering applications, just look at the procurement Staff preferences.
For relatively common indicators, such as color sensitivity, black and white sensitivity, color resolution, black and white resolution, wide dynamic backlight compensation, infrared light sources and other terms and technologies, buyers must have a clear understanding, these directly affect the main effect of the use of ; For other performance and indicators such as color to black and white conversion time, external signal trigger conversion, complete menu debugging, part of the menu debugging, full DIPSW debugging, for the engineering business, is the need to see the need, the wise see wisdom .
Day and night camera installation and commissioning
Compared with the installation of ordinary cameras, there are still some special places for the installation of day and night machines. It is worth noting that due to the effect of nighttime, some manufacturers use 1/2" CCD target planes. For such day and night machines, When installing the lens should also consider installing a lens not less than 1/2 inch, so that on the one hand the image does not produce vignetting, on the other hand, fully respond to the original intention of manufacturers to increase the photographic area to enhance the night effect, must not use small size The lens caused a pity of waste, and now with the wide application of day and night machines, the impact of ordinary lenses on infrared light is gradually reflected, and some manufacturers have developed infrared lenses to correct this effect, the installation of this type of lens as far as possible.
In addition, the auto iris lens should be used as much as possible to make the effect of the day and night display more adequate.
Thanks to the technological development of DSP, the current camera debugging is getting more and more delicate, and more and more accurate. The debugging mode can be varied, pure menu debugging, menu and DIPSW with debugging, remote debugging, pure DIPSW, etc. The camera with a pure menu method looks neat and clean, with only a few buttons, and even these buttons can be hidden, but do not forget to bring a small monitor at the scene to debug, otherwise you will be exhausted. Remote debugging is very convenient, but generally have the same brand of back-end control equipment support, and most of the coaxial transmission with the video line, it can be considered a coaxial control. The DIPSW method is much simpler and suitable for the needs of the lower-end users. Another thing to note is that some manufacturers do not know why, when using menus and DIPSW cooperation methods, sometimes there are some features that are duplicated. The first debugging will be the second-in-law monk puzzled, not to be confused by it.
Day and night debugging content on the machine should pay attention to the following debugging:
Backlight compensation: Many day and night dual-use machines can independently perform backlight compensation adjustments for multiple areas. This is important for fixed-mount cameras, and the screen level will be the least damaged;
Long-distance video compensation is a good news for those who have cameras equipped with this function. Video cameras within 1000 meters can receive accurate video compensation, not only amplitude but also high-frequency video.
When the color turns black, this parameter is quite interesting. When the car headlight flashes, it turns to color, and the lengthened image may be dark for several tens of seconds (the color is not transferred to black and white). This determination depends on the technology. Repeated comparison of personnel, but also on the night of the scene, with a monitor for debugging;
The color-to-black signal level, as above, is also to be on-site, with the color-to-black time to adjust the signal level;
Note that infrared allergy, some day and night models in the design flawed, after turning to black and white at night, if the outside world has infrared light, it will constantly switch between color and infrared, very annoying, in this case, either Withdrawing the infrared light, either have to change the machine.
Day and night camera purchase
Speaking of the selection of dual-use cameras for day and night, it is rather interesting to talk about many people's attitude toward it. There have been many opinions about dual-use cameras day and night. Some say that dual-use cameras are not practical and the color of the cameras is dark. It can be used as a monitor that users watch every day but they cannot turn black, but color monitors do. Where can black and white images go? Some say that for a color CCD, the natural resolution is lower than that of a black and white CCD of the same grade. With the same CCD, no matter how it is processed, it is impossible to achieve the black and white effect; Although the frame accumulation has improved some effects, it is still noisy at night, and the smearing of moving objects cannot be solved. It seems to be an itching issue to solve day and night problems. There are complaints from the large gap between the imagination of the project contractors and their own imagination. There are also manufacturers or sellers who make different interpretations of the day and night cameras on their own positions, making it difficult for the contractors who need to purchase products to be at a loss. "Ponies crossing the river."
With the continuous expansion of the day and night camera concept and the continuous innovation of related technologies and the ever-increasing levels of products, it is inevitable that such a situation is present. As a buyer, how to purchase a project that suits their engineering needs, and the cost performance is good Products are sometimes not easy.
First of all, to select a day/night camera must be equipped with technical personnel to fully understand the user's requirements and the actual needs of the project environment, to fully understand the exact meaning of the indicators in day and night cameras, this work is difficult to be "full "Two words, because day and night cameras are still changing, and new things will continue to emerge. If you don't "sufficiently", it's easy to have problems.
In addition, to select a brand with a larger product and a good service word of mouth, in general, the product with a large brand and the product data are more reliable in terms of performance, especially if the product is more systematic, even if new products are introduced. Series, there are also fewer "side effects"; service providers, well-known sellers will objectively introduce the advantages and disadvantages of certain products, allowing you to avoid detours in the purchase. Again, more than a few elections, repeated comparisons, in order to be aware of.
In the end, it must be seen as a fact. After repeated trials and trials, it can be purchased. Do not underestimate this point, but it is quite important. It is a magic weapon for many engineering companies. As far as day and night cameras are concerned, there are currently some products that are not mature enough to be pushed onto the market. As a result, they have disastrous consequences for contractors. , And this kind of immature, unstable, not through repeated and meticulous testing, simply can not be found, for example, there is a company's product color to black and white process is very good, the effect of day and night is also good, can be an infrared light If something goes wrong, it will constantly switch between color and black and white. For such products, no matter how manufacturers explain or make up for it, as a product that has already gone to market, from the producer to the user The interests of all parties have been damaged. Therefore, the engineering company must test and simulate on-site commissioning both before and after the procurement of the product.
Whether it is to adopt a filter-type filter or a filter-type improvement method, it is in favor of a hardware method or a software method. These two methods have their advantages and disadvantages. The hardware method is intuitive and has the advantages of simple implementation, but it has a lifetime problem, and Will be affected by the process and assembly, the cost of the product is also high, the software is low-cost, long life, but there are anti-jamming issues, and must consider whether the program is perfect, it is difficult to distinguish in engineering applications, just look at the procurement Staff preferences.
For relatively common indicators, such as color sensitivity, black and white sensitivity, color resolution, black and white resolution, wide dynamic backlight compensation, infrared light sources and other terms and technologies, buyers must have a clear understanding, these directly affect the main effect of the use of ; For other performance and indicators such as color to black and white conversion time, external signal trigger conversion, complete menu debugging, part of the menu debugging, full DIPSW debugging, for the engineering business, is the need to see the need, the wise see wisdom .
Day and night camera installation and commissioning
Compared with the installation of ordinary cameras, there are still some special places for the installation of day and night machines. It is worth noting that due to the effect of nighttime, some manufacturers use 1/2" CCD target planes. For such day and night machines, When installing the lens should also consider installing a lens not less than 1/2 inch, so that on the one hand the image does not produce vignetting, on the other hand, fully respond to the original intention of manufacturers to increase the photographic area to enhance the night effect, must not use small size The lens caused a pity of waste, and now with the wide application of day and night machines, the impact of ordinary lenses on infrared light is gradually reflected, and some manufacturers have developed infrared lenses to correct this effect, the installation of this type of lens as far as possible.
In addition, the auto iris lens should be used as much as possible to make the effect of the day and night display more adequate.
Thanks to the technological development of DSP, the current camera debugging is getting more and more delicate, and more and more accurate. The debugging mode can be varied, pure menu debugging, menu and DIPSW with debugging, remote debugging, pure DIPSW, etc. The camera with a pure menu method looks neat and clean, with only a few buttons, and even these buttons can be hidden, but do not forget to bring a small monitor at the scene to debug, otherwise you will be exhausted. Remote debugging is very convenient, but generally have the same brand of back-end control equipment support, and most of the coaxial transmission with the video line, it can be considered a coaxial control. The DIPSW method is much simpler and suitable for the needs of the lower-end users. Another thing to note is that some manufacturers do not know why, when using menus and DIPSW cooperation methods, sometimes there are some features that are duplicated. The first debugging will be the second-in-law monk puzzled, not to be confused by it.
Day and night debugging content on the machine should pay attention to the following debugging:
Backlight compensation: Many day and night dual-use machines can independently perform backlight compensation adjustments for multiple areas. This is important for fixed-mount cameras, and the screen level will be the least damaged;
Long-distance video compensation is a good news for those who have cameras equipped with this function. Video cameras within 1000 meters can receive accurate video compensation, not only amplitude but also high-frequency video.
When the color turns black, this parameter is quite interesting. When the car headlight flashes, it turns to color, and the lengthened image may be dark for several tens of seconds (the color is not transferred to black and white). This determination depends on the technology. Repeated comparison of personnel, but also on the night of the scene, with a monitor for debugging;
The color-to-black signal level, as above, is also to be on-site, with the color-to-black time to adjust the signal level;
Note that infrared allergy, some day and night models in the design flawed, after turning to black and white at night, if the outside world has infrared light, it will constantly switch between color and infrared, very annoying, in this case, either Withdrawing the infrared light, either have to change the machine.
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