How to choose a suitable explosion-proof infrared camera is a concern for many engineering users. In addition to looking at brands and seeing explosion-proof grades, there are actually many parameters that affect the performance of explosion-proof infrared cameras. Users are very confused about whether these parameters are suitable for explosion protection. How does the performance of the infrared camera affect how these parameters are viewed?
The parameters of the three main parameters of the three parameters pixel, line number and clarity represent what the meaning, the following detailed analysis!
The first is the explosion-proof infrared camera's pixels, which are the basic elements that make up the image. Explosion-proof infrared cameras' surveillance images are composed of consecutive fast-moving images, and these images are composed of one pixel. It's equivalent to magnify an image a lot of times, then divide it from left to right and from top to bottom, it is regularly divided into many grids, fill a color in each grid, and then reduce the image to its original size. It forms an image we usually see. These grids are equivalent to pixels. The number of pixels is generally determined by the manufacturer. The more pixels, the finer and clearer the image, ie, the higher the resolution.
For PAL, the last vertical resolution you see is 625. Further, the picture we see is not composed of all 625 lines. In fact, there are 49 lines for transmitting other information such as closed captions, texts, test signals, etc. It also takes some time when the electron beam goes from the bottom to the top to begin scanning the next image. To remove the number of rows that we "invisible", we see a picture that actually consists of a maximum of 576 lines. This is also the highest vertical resolution of the PAL system. Further, due to the imaging reasons and human visual characteristics, these 576 lines are only the theoretical resolution. The actual vertical resolution of the image you "see" must also be multiplied by a correction factor less than 1, which is called the Kell coefficient. For interlaced scanning, the Kell coefficient is 0.7, so for the PAL system, the vertical resolution of the last displayed image is about 400 lines. When actually viewing the test chart, the observed vertical resolution can usually reach about 450 lines because the Kell coefficient is not considered.
The vertical resolution is completely determined by the signal format, which is very easy to understand. Horizontal definition is the most easily confusing concept. The biggest problem is that there are multiple expressions of horizontal definition. In the field of video surveillance such as explosion-proof infrared cameras, we are more accustomed to using the "per image height" pixels to represent the horizontal resolution, or called "TV lines." The origin of this habit dates back to 60 years before the television was born. At the time, because the format of the signal had determined the vertical resolution of the image, the experts' idea was to represent horizontal resolution in a manner that was related to vertical clarity. In other words, whether it is clearer in the horizontal direction or clearer in the vertical direction can be clearly seen through this relative clarity. For this reason, horizontal definition is defined as the number of pixels that can be displayed in the horizontal direction that is equal to the screen height. The definition obtained under this definition is called the "TV line", which is the so-called line number. Therefore, when you still hear how much clarity a video signal has, it doesn't mean how many pixels are from the leftmost to the rightmost edge of the image, but how many pixels are in the same horizontal width as the height of the image.
The image transmitted by the explosion-proof infrared camera is not a boxy one, but the display ratio is generally 4:3 or 16:9. That is, to achieve the same horizontal resolution as the vertical resolution, the pixels in the horizontal direction should reach 4/3 or 16/9 times the vertical resolution.
The image quality of the image sharpness signal processing level of the processing circuit × the display quality of the display mode. All three factors are equally important in determining the final image quality. Any difference in the links will result in a decrease in the horizontal resolution of the final image. Even if some products improve the performance of the processing circuit or the display performance, if there is no corresponding signal source, the image quality cannot be significantly improved. Rong Fang Technology believes that high-definition explosion-proof monitoring system needs not only a million HD explosion-proof surveillance cameras, but also the back-end processing and display of high-definition, so that performance can play better.
In the same product, any one of the three indicators will change, and the other two indicators will also change. This is the reason why the relationship between the three is rarely viewed.
For the installation of explosion-proof infrared cameras, the following points should be noted:
Explosion-proof infrared cameras should avoid direct light sources when installing, because the infrared light is based on the photosensitive resistor installed on the infrared light board to control the operating power is turned on or not. In addition, explosion-proof IR cameras should avoid objects that absorb infrared light, such as all-black objects, open spaces, and water, because if infrared light is absorbed or attenuated, the explosion-proof infrared camera's shooting effect will be greatly reduced. Explosion-proof infrared camera selection and construction and installation process need to pay attention to the matters that Xiaobian make a simple induction and analysis.
Explosion-proof infrared camera installation position to avoid strong light (such as sunlight, lights, etc.), otherwise it will easily lead to excessive bright or light (not a fault), it will also affect the life of the CCD; In addition, infrared light has the same reflection as visible light , refraction and other characteristics, so in the absence of a good reflective environment around the target scenery (such as buildings, walls, signs) should consider a certain distance margin; different media transmittance and reflectivity are different, so different protective glass, especially Glass with automatic defrosting coating will cause some attenuation of infrared light, and special attention must be paid to construction.
Explosion-proof infrared cameras should be kept away from humid, dusty, extremely hot, cold, and strong electromagnetic radiation. Weather conditions such as rain, fog, and dust are all factors that restrict the distance from the infrared light. In addition, the difference in reflectivity between the site environment and the monitoring target will also make the night vision effect very different. Therefore, it must be tested before installation. The camera is well tested.
The parameters of the three main parameters of the three parameters pixel, line number and clarity represent what the meaning, the following detailed analysis!
The first is the explosion-proof infrared camera's pixels, which are the basic elements that make up the image. Explosion-proof infrared cameras' surveillance images are composed of consecutive fast-moving images, and these images are composed of one pixel. It's equivalent to magnify an image a lot of times, then divide it from left to right and from top to bottom, it is regularly divided into many grids, fill a color in each grid, and then reduce the image to its original size. It forms an image we usually see. These grids are equivalent to pixels. The number of pixels is generally determined by the manufacturer. The more pixels, the finer and clearer the image, ie, the higher the resolution.
For PAL, the last vertical resolution you see is 625. Further, the picture we see is not composed of all 625 lines. In fact, there are 49 lines for transmitting other information such as closed captions, texts, test signals, etc. It also takes some time when the electron beam goes from the bottom to the top to begin scanning the next image. To remove the number of rows that we "invisible", we see a picture that actually consists of a maximum of 576 lines. This is also the highest vertical resolution of the PAL system. Further, due to the imaging reasons and human visual characteristics, these 576 lines are only the theoretical resolution. The actual vertical resolution of the image you "see" must also be multiplied by a correction factor less than 1, which is called the Kell coefficient. For interlaced scanning, the Kell coefficient is 0.7, so for the PAL system, the vertical resolution of the last displayed image is about 400 lines. When actually viewing the test chart, the observed vertical resolution can usually reach about 450 lines because the Kell coefficient is not considered.
The vertical resolution is completely determined by the signal format, which is very easy to understand. Horizontal definition is the most easily confusing concept. The biggest problem is that there are multiple expressions of horizontal definition. In the field of video surveillance such as explosion-proof infrared cameras, we are more accustomed to using the "per image height" pixels to represent the horizontal resolution, or called "TV lines." The origin of this habit dates back to 60 years before the television was born. At the time, because the format of the signal had determined the vertical resolution of the image, the experts' idea was to represent horizontal resolution in a manner that was related to vertical clarity. In other words, whether it is clearer in the horizontal direction or clearer in the vertical direction can be clearly seen through this relative clarity. For this reason, horizontal definition is defined as the number of pixels that can be displayed in the horizontal direction that is equal to the screen height. The definition obtained under this definition is called the "TV line", which is the so-called line number. Therefore, when you still hear how much clarity a video signal has, it doesn't mean how many pixels are from the leftmost to the rightmost edge of the image, but how many pixels are in the same horizontal width as the height of the image.
The image transmitted by the explosion-proof infrared camera is not a boxy one, but the display ratio is generally 4:3 or 16:9. That is, to achieve the same horizontal resolution as the vertical resolution, the pixels in the horizontal direction should reach 4/3 or 16/9 times the vertical resolution.
The image quality of the image sharpness signal processing level of the processing circuit × the display quality of the display mode. All three factors are equally important in determining the final image quality. Any difference in the links will result in a decrease in the horizontal resolution of the final image. Even if some products improve the performance of the processing circuit or the display performance, if there is no corresponding signal source, the image quality cannot be significantly improved. Rong Fang Technology believes that high-definition explosion-proof monitoring system needs not only a million HD explosion-proof surveillance cameras, but also the back-end processing and display of high-definition, so that performance can play better.
In the same product, any one of the three indicators will change, and the other two indicators will also change. This is the reason why the relationship between the three is rarely viewed.
For the installation of explosion-proof infrared cameras, the following points should be noted:
Explosion-proof infrared cameras should avoid direct light sources when installing, because the infrared light is based on the photosensitive resistor installed on the infrared light board to control the operating power is turned on or not. In addition, explosion-proof IR cameras should avoid objects that absorb infrared light, such as all-black objects, open spaces, and water, because if infrared light is absorbed or attenuated, the explosion-proof infrared camera's shooting effect will be greatly reduced. Explosion-proof infrared camera selection and construction and installation process need to pay attention to the matters that Xiaobian make a simple induction and analysis.
Explosion-proof infrared camera installation position to avoid strong light (such as sunlight, lights, etc.), otherwise it will easily lead to excessive bright or light (not a fault), it will also affect the life of the CCD; In addition, infrared light has the same reflection as visible light , refraction and other characteristics, so in the absence of a good reflective environment around the target scenery (such as buildings, walls, signs) should consider a certain distance margin; different media transmittance and reflectivity are different, so different protective glass, especially Glass with automatic defrosting coating will cause some attenuation of infrared light, and special attention must be paid to construction.
Explosion-proof infrared cameras should be kept away from humid, dusty, extremely hot, cold, and strong electromagnetic radiation. Weather conditions such as rain, fog, and dust are all factors that restrict the distance from the infrared light. In addition, the difference in reflectivity between the site environment and the monitoring target will also make the night vision effect very different. Therefore, it must be tested before installation. The camera is well tested.
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