High-definition lens technology can be used for night shooting
Razor Barbed Wire,Galvanized Razor Barbed Tape,Iron Razor Barbed Wire Hengqu Metal Products Co., Ltd. , http://www.gzwiremesh.com
The advantage of the dual-use day/night camera is that even in low-light environments or even in environments with no visible light illumination, night-time or near-infrared light can be used to illuminate the monitoring object, clear images can be observed, and monitoring objects can be identified. Both need a suitable aspherical lens and infrared filter imaging technology in the lens.
To overcome this problem and make the lens suitable for day/night cameras, it is necessary to minimize 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 pronounced. Therefore, aspherical lens technology must be used to reduce the dispersion of optical lens and chromatic aberration. With this aspherical lens imaging technology, Day/Night can be monitored in Day/Night or Day/Night when the color image is in the daytime. It can also control the focus offset problem to intangible. It can be continuously monitored 24 hours a day and night. Application requirements. In addition, due to IR's wide range of day and night lens wavelengths, it is necessary to pay attention to the problem of light spots caused by light transmittance, and carefully apply the pre-approval inspection and selection of lens coating effects.
Application of Lens Technology in Camera Transparency
Surveillance Cameras and Cameras In order to meet the low-light monitoring requirements of night vision, many manufacturers began to manufacture more sensitive low-light cameras, and in the Sensor and the lens with a large diameter development, is to increase the F through the lens to improve the caliber The amount of light allows the camera to function as a camera with low illumination.
However, it is worth mentioning that the F value of the lens will increase with the increase of the lens diameter, and it will decrease inversely. The smaller the F value, the better the performance. In order to obtain a large amount of light into the lens, sometimes the lens size can be increased by increasing the aperture and length of the lens to obtain a smaller F value. This is a common application in lens technology. However, due to the design and application of surveillance cameras, as well as the limitations of the installation site, the volume has become smaller and smaller, and the lens itself has to be more compact, which also makes the design of the lens aperture larger. What merits more attention is to design a smaller lens F value, it is necessary to increase the design of compensation aberrations, which is a difficult application of lens technology, because the aberration will make the lens optical performance changes in deformation imaging and appearance The increase in this inch. Fortunately, in this part, the suppression of the performance deformation and the increase of the external dimensions can be solved by adopting the aspherical lens design to effectively compensate the aberration and realize the miniaturization design. In the current market, a variety of focal length manual zoom lens, is born in response to this demand, the current lens size and diameter continue to increase, F1.0 or even greater are already possible.
Application of Lens Technique in Camera Imaging Size Relationship
The surveillance camera angle coverage is closely related to the lens imaging technology. Under the slogan of high-definition video surveillance, surveillance wide-angle has become the focus of surveillance camera installation. However, this is not a problem that the camera can completely bear. For cameras installed in entrances, staircases, buses, subways, elevators, and bank teller areas, there are dilemmas that cannot completely cover the desired scene. More cameras must be set up to achieve surveillance without blind spots. The requirements, however, have improved the imaging technology of the lens. The current technology requires only one wide-angle camera to cover all monitored screen requirements. However, in the pursuit of wide-angle, we must pay attention to avoid the following problems, such as the increase in the lens lens diameter after the increase in the size of the camera, image distortion and distortion rate is too high, these are the lens technology and imaging Part of the relationship to be careful, but fortunately, the lens technology has also been developed to solve these application problems as compared to the wide-angle lens plus multi-focus and manual zoom technology products.
Application of lens technology in high-definition video
Monitoring the demand for megapixel lenses is an established fact, whether it is for any kind of industry application, except that the camera's image sensor is moving towards high-definition image trends. In order to truly achieve clear and detailed high-definition video, megapixel cameras ranging from 2 million to 3 million, and even 5 million pixels are commercially available. However, there is still a problem, that is, for the part of the high-power zoom lens, which is applied to the high-speed ball, because the telescopic lens group of the movement module also has a high-transmittance lens with an aspherical surface, there are still many opinions, even in part. According to actual measurements, the results show that the HD resolution of the high-definition camera is still significantly different from that of the HD camera with the same conditions.
In addition, the simulation monitoring camera resolution, after the advent of the 960H chip, the resolution and recognition rate from the past 540TVL to 700TVL. Therefore, the high-definition lens technology in order to meet the emergence of these high-definition video camera is also spontaneous combustion in the development of technology from the original maximum of 2 million pixels in one fell swoop developed to a 5-megapixel technical level. Again with CMOS
The constant height of the pixels of the sensor photosensitive component causes the pixel size of the pixel point to also become smaller, so the camera's pixel conversion force MTF (Modulation Transfer Function); that is, the pixel resolution of the pixel transmitted by the original optical imaging and The frequency value of the ability to display the contrast as the resolution also has to be increased in order to resolve the more detailed corresponding line TVL (TVLine). In order to effectively perform high pixel performance, these lenses have high resolution and high contrast not only at the center of the screen but also at the edges of the screen. At the same time, the surveillance lens has not only reduced distortion in the imaging technology, but also the current manufacturing technology has a robust structure that is shockproof and crashworthy, and a fixed knob that prevents accidental contact with the focus offset. It can be said that the entire technology is monitored. The lens has improved in both structure and application technology over the previous lens improvements.
High-definition surveillance has become an obvious trend in recent years. The functional requirements and application requirements of the surveillance application market are also increasing. With the development of high-definition cameras, the camera has been leading the development of the lens, only to see the lens in this year. New application technologies such as night vision and fog penetration have also caught up, and the monitoring application is no longer stretched like the previous two years. It seems that this is a blessing for high-definition surveillance.