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, and the 1/4-inch CCD has only 44% of the 1/3-inch CCD. Coffee Machines,Automatic coffee machine,commercial coffee machines,best coffee machines for home Jiangmen Sengho Houseware Co.,LTD , https://www.jmsengho.com
CCD photosensitive device
At present, there are three major suppliers of CCDs for infrared cameras, namely SONY, SHARP, and LG. In these three types of CCDs, SONY's CCD sensitivity is relatively good. The commonly used SONY CCD low-light technology is SuperHADCCD; later SONY developed a super Sensitivity CCD, SONY called EXPVIEWCCD, the sensitivity of the CCD is 5 times SuperHADCCD.
Image DSP processing
Since the development of low-intensity infrared cameras, not only has the development of hardware technology, but also outstanding performance for DSP image processing, such as color to black technology and low-speed electronic shutter, that is, the emergence of frame accumulation technology.
Color to black technology
The sensitivity of a black-and-white camera is usually much higher than that of a color camera. Since a black-and-white camera, DSP operation only processes two colors, that is, black and white, a certain part of the low-intensity infrared camera now has a color to black and white. The function, that is, the daytime color 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, in order to ensure that the critical value will 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.
Four Tips to Buy Low-Immance Infrared Cameras
The lens is an important component of the infrared camera component. Its function is to focus the light of the object for the CCD of the infrared camera to image the scene 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 lens diameter, 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.