How to choose a low-illuminance infrared camera from four aspects
2023-07-07 15:08:23
In the CCD and DSP technology is becoming more and more advanced, low-illuminance infrared cameras are increasingly mature and stable, many manufacturers (businessmen) lower the camera's illuminance parameters, from 1.0lux to 0.1lux, to 0.001lux, etc., then these cameras Is there really such a high sensitivity? In order to truly understand the low-intensity infrared camera, elaborated from the following aspects.
Lens <br> <br> infrared camera as an important part of the member, its role is a CCD camera focused infrared rays subject object, so that the scene is imaged on the CCD. The amount of light that can be captured directly determines the clarity of the CCD image. To measure how much light is taken by the lens, it is called the amount of light, and the amount of light entering the lens is expressed by the F value (aperture). F value = f (focal distance) / D (effective aperture of the lens), which is inversely proportional to the aperture, and is proportional to the distance from the focal point. With the same focal length, the larger the aperture of the lens, the smaller the F value and the greater the amount of light entering the lens. The F value of common lenses is mostly 1.2, 1.4, and there are currently F1.0 lenses. Therefore, in order to make the infrared camera obtain the ideal low illumination effect, it is necessary to configure a lens with a suitable or configured F value.
<br> <br> CCD sensor device commonly used in CCD infrared cameras currently has three main suppliers, namely SONY, SHARP and LG, in the three CCD, SONY CCD sensitivity is relatively good, low-light technology commonly used SONYCCD For SuperHADCCD; later SONY has also developed a super-sensitivity CCD, SONY called the REVIEWCCD, the CCD sensitivity of SuperHADCCD 5 times.
In addition, the size of the CCD also has a great impact on the sensitivity, the larger the size, the better the sensitivity. In order to make infrared cameras have a lower illuminance index, 1/2-inch CCD cameras are often used. Data shows that the 1/3-inch CCD has only 56% of the 1/2-inch CCD, while the 1/4-inch CCD has only 44% of the 1/3-inch CCD.
Image Processing DSP <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> .
Color to black technology <br> <br> sensitivity monochrome camera will generally be much higher sensitivity than the color cameras, because black and white camera, DSP arithmetic processing only two colors, namely black and white, so now a considerable part of The low-illuminance infrared camera has the function of changing color to black and white, that is, it is a color image during the day, and the image is converted into a black-and-white image by software processing at night, and a lower illumination is obtained by sacrificing the color effect.
The process of converting color to black and white is controlled by the charge converted by the CCD to collect light. When the charge intensity reaches a certain critical value, it is automatically converted to a black and white image. Similarly, to ensure that the critical value does not cause repeated switching, it will do A delay in processing.
Through the above analysis, the user can not blindly look at the minimum illuminance parameters marked by each merchant when selecting a low-illuminance infrared camera, but should select the corresponding low-illuminance infrared camera according to the application environment, requirements, monitoring objects, and economic capabilities.
Lens <br> <br> infrared camera as an important part of the member, its role is a CCD camera focused infrared rays subject object, so that the scene is imaged on the CCD. The amount of light that can be captured directly determines the clarity of the CCD image. To measure how much light is taken by the lens, it is called the amount of light, and the amount of light entering the lens is expressed by the F value (aperture). F value = f (focal distance) / D (effective aperture of the lens), which is inversely proportional to the aperture, and is proportional to the distance from the focal point. With the same focal length, the larger the aperture of the lens, the smaller the F value and the greater the amount of light entering the lens. The F value of common lenses is mostly 1.2, 1.4, and there are currently F1.0 lenses. Therefore, in order to make the infrared camera obtain the ideal low illumination effect, it is necessary to configure a lens with a suitable or configured F value.
<br> <br> CCD sensor device commonly used in CCD infrared cameras currently has three main suppliers, namely SONY, SHARP and LG, in the three CCD, SONY CCD sensitivity is relatively good, low-light technology commonly used SONYCCD For SuperHADCCD; later SONY has also developed a super-sensitivity CCD, SONY called the REVIEWCCD, the CCD sensitivity of SuperHADCCD 5 times.
In addition, the size of the CCD also has a great impact on the sensitivity, the larger the size, the better the sensitivity. In order to make infrared cameras have a lower illuminance index, 1/2-inch CCD cameras are often used. Data shows that the 1/3-inch CCD has only 56% of the 1/2-inch CCD, while the 1/4-inch CCD has only 44% of the 1/3-inch CCD.
Image Processing DSP <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> .
Color to black technology <br> <br> sensitivity monochrome camera will generally be much higher sensitivity than the color cameras, because black and white camera, DSP arithmetic processing only two colors, namely black and white, so now a considerable part of The low-illuminance infrared camera has the function of changing color to black and white, that is, it is a color image during the day, and the image is converted into a black-and-white image by software processing at night, and a lower illumination is obtained by sacrificing the color effect.
The process of converting color to black and white is controlled by the charge converted by the CCD to collect light. When the charge intensity reaches a certain critical value, it is automatically converted to a black and white image. Similarly, to ensure that the critical value does not cause repeated switching, it will do A delay in processing.
Through the above analysis, the user can not blindly look at the minimum illuminance parameters marked by each merchant when selecting a low-illuminance infrared camera, but should select the corresponding low-illuminance infrared camera according to the application environment, requirements, monitoring objects, and economic capabilities.
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