General day and night cameras are used in roads, airports, ports or school perimeters and factories, residential buildings, and parking lots that require 24 hours of continuous monitoring, so they are used for high-definition day and night cameras. The requirements are also getting higher and higher. The advantage of the day and night camera is that even in low illumination or even in the absence of visible light illumination, it is possible to use night mode or use near infrared light to illuminate the monitoring object, observe clear images, and identify the monitored objects, but these A suitable aspherical lens and infrared filter imaging technology in the lens are required. If only the general spherical non-red line filter lens is used, it is installed on the day/night camera. In the night mode, the focus of the image cannot be concentrated and the chromatic aberration will occur, which causes the image to be offset and cannot be obtained clearly. image.
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In order to overcome this problem, the lens can be applied to a day/night camera, and it is necessary to reduce the chromatic aberration from the visible light region to the near infrared region. For the lens, the longer the focal length, the more difficult it is to compensate for chromatic aberration; if the chromatic aberration in the visible and near-infrared regions increases, the focal length is more conspicuous. Therefore, it is necessary to use an aspherical lens technology low dispersion optical lens to suppress such focal length shift and chromatic aberration. With this aspherical lens imaging technology, day/night monitoring mode or Day/Night switching of color image nighttime black and white mode can be performed, and the focal length shift problem can be controlled to invisible, and it can be continuously monitored 24 hours a day and night. Application requirements. In addition, since the wavelength range of the IR day and night lens is large, it is necessary to pay attention to the spot problem caused by the light transmittance, and carefully check and select the lens coating effect in advance.
Application of lens technology in the relationship between camera aperture
Surveillance Lenses and Cameras In order to meet the low-illumination monitoring needs of night vision, many manufacturers have begun to create more sensitive low-light cameras, and the Sensor and lens are geared toward large-caliber development, which is to improve the lens's aperture F value. The amount of light allows the lens to make the camera look low-light.
However, it is worth mentioning that the F value of the lens will increase with the increase of the lens aperture, and it will decrease inversely. The smaller the F value, the better the performance. In order to obtain a larger amount of lens light, sometimes the lens aperture r and length are increased to obtain a smaller F value, thereby improving the performance of the lens. This is a common application in lens technology. However, due to the design and application of surveillance cameras, as well as the limitations of installation sites, the volume is increasingly miniaturized, and the lens itself must be smaller, which also makes the design of the lens aperture larger. What is more noteworthy is to design a smaller lens F value, it is necessary to increase the compensation aberration design, which is a difficult problem in the application of lens technology, because the aberration will make the lens optical performance change deformation imaging and appearance This inch has increased. Fortunately, in this part, the performance deformation and the increase of the external dimensions can be solved by using an aspherical lens design to effectively compensate for aberrations and achieve a compact design. The manual zoom lens with various focal lengths on the market is born in response to this demand. The current lens volume and caliber are constantly increasing, and F1.0 or even larger is already possible.
Application of lens technology in camera image size
The surveillance camera angle and the size of the lens imaging technology are absolutely closely related. Recently, under the slogan of high-definition video, monitoring wide-angle has become the focus of surveillance camera erection, but this is not a problem that the camera can fully bear. If there are cameras installed in small entrances such as entrances, ladders, buses, subways, elevators, and bank teller areas, there are circumstances that cannot fully cover the desired scenes. It is often necessary to set up more cameras to achieve monitoring without dead ends. Requirement, however, the lens's imaging technology has been improved. The current technology can cover all the monitored images with only one wide-angle camera. However, in the pursuit of wide-angle, it is necessary to pay attention to avoid the problems that come with it, such as the increase in the size of the camera after the lens is enlarged, the image distortion and the distortion rate are too high. These are lens technology and imaging. The part to be careful about, but it is also good, lens technology is also developed in the wide-angle lens plus multi-focus and manual zoom technology products to solve these application problems.
Lens technology in the application of image HD
The need to monitor megapixel lenses is an established fact, whether for any industry application, except that the camera's image sensor is moving toward high-definition images. In order to truly achieve clear and detailed high-definition images, megapixel lenses ranging from 2 million to 3 million and even 5 million pixels are officially commercialized. However, there is still a problem that for the part of the high-magnification zoom lens, the part applied to the high-speed ball, because the telescopic lens set of the movement module also has a high-transmittance lens with aspherical surface, there are still many different opinions, even in the part. Under the actual measurement, the results prove that the high-definition ball of a million high-definition is still significantly different from the high-definition one-shot machine under the same conditions.
In addition, the resolution of the surveillance surveillance camera, after the introduction of the 960H chip, the resolution and recognition rate has also increased from the past 540TVL to 700TVL. Therefore, in order to cope with the production of these high-definition cameras, the high-definition technology of the lens has also developed from the original 2 million pixels to the technical level of 5 million pixels. Again with CMOS
The pixel height of the sensor's photosensitive component is such that the size of the pixel point Pixel is also reduced, so the lens's pixel transforming force MTF (ModulationTransferFunction); that is, the lens resolution of the pixel that is transmitted by the original ingested optical imaging is The value of the frequency in which the contrast is expressed as the degree of resolution is also necessary to be larger, in order to resolve and discern the more subtle corresponding line TVL (TVLine). In order to effectively achieve high pixel performance, these lenses have high resolution and high contrast not only at the center of the picture, but also at the edge of the picture. At the same time, the monitoring lens not only reduces the distortion in the imaging technology, but also the manufacturing technology has a solid structure with shockproof and anti-collision, and a fixed knob for preventing the mis-focus offset. It can be said that the whole technology is monitored. The lens has been improved in structure and application technology compared to the past lens improvement.
Monitoring HD has been an obvious trend in recent years. The monitoring application market is increasingly demanding for the functional requirements and applications of the lens. In addition, the camera has been leading the development of the lens in the development of high definition. New application technologies such as night vision and fog have been chased up, and the monitoring application is no longer as stretched as the previous two years. It seems that this is a blessing for high-definition surveillance.
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