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Why do images presented by a lens have optical aberrations?A. DistortionDistortion will cause real objects to be straight lines, but in photos to be non-straight lines, to be curved lines.a) barrelb) pincushionc) complex/wavyTypes of lenses prone to distortion: usually zoom lenses and wide-angle lenses.B. Field curvatureFor plane objects in reality, after imaging, the real image surface is curved, and most actual sensors are also flat, which will cause the center field of view and the edge field of view to be unable to present clear images at the same time.Lens types prone to field curvature: usually wide-angle lenses and large aperture lenses.C. Vignettinga) Vignetting-----Light FalloffUneven brightness Light Falloff, the exposure of the center field of view and the edge field of view are different, resulting in inconsistent brightness between the center and edge of the picture, which is what we often call the camera vignetting problem.b) Vignetting-----Color CastUsually there is a color difference between the edges of the picture (especially the corners) and the center area. It is not entirely caused by lens aberration, filters and sensors will also have a certain impact.Types of lenses prone to vignetting: usually largeThere are many factors that cause optical aberration in lenses, some of which have been shared above:1) distortion2) field curvature3) Vignetting ---Light Falloff4) Vignetting ---Color CastIn fact, there are some other influencing factors:1) Focus ShiftWhen you reduce the aperture size, the best focus plane will move to the front or back. That is, the aperture size will affect the best focus plane position, which is what we call focus shift.Common lenses that are prone to focus shift: large aperture lenses. When adjusting the aperture, the focus usually needs to be re-adjusted.2) Onion ring bokehThere are some out-of-focus circular rays of light in the optical path of the lens, which is generally caused by a defective lens.Common lenses that are prone to "onionrings": Some large aperture lenses often use aspherical lenses because of the flatness of the surface involved during processing.3) Flare-GhostingWhen there are some abnormal colored patches in the presented image, usually like colored circles or colored blocks of specific shapes, we become ghost images.Common ghost images: zoom lenses, lenses with a large number of lenses, and large-diameter lenses. During processing, try to reduce the aperture as much as possible, or use post-image processing.4) Flare-Internal ReflectionsGenerally speaking, highly reflective objects inside the lens, such as structural parts with too high reflectivity, or dirty lenses in the optical path, etc. In most cases it is caused by workmanship issues.Common internal reflection stray light lenses:especially large aperture lenses, during the production process, you can try to eliminate light, cut off light, block stray light, increase transmittance, and reduce the aperture as much as possible when conditions permit.

In recent years, with the development of technology and the continuous improvement of technological level, various high-definition, networked, and intelligent security monitoring products have emerged one after another, greatly enriching the demand for security monitoring products in various industries.Meanwhile, with the development and deepening of security projects such as "Ping An City" and "Ping An Campus" nationwide in recent years, and the continuous improvement of video monitoring coverage, monitoring points, and network transmission video quality requirements for users in airports, subways, and scenic spots, network monitoring is becoming an important driving factor in the Chinese video monitoring market.The overall solution for video surveillance from network monitoring equipment manufacturers is gaining more and more understanding and recognition from users.What is the market demand for security surveillance cameras?The market prospects for security monitoring lenses are bright. With the continuous development of technology and the expansion of application fields, the demand for CCTV lenses will continue to increase. For example, in the field of security, with the continuous improvement of people's security awareness, the requirements for security measures are becoming higher and higher. As an important component of security monitoring systems, the market demand for CCTV cameras will continue to grow.In addition, with the development of artificial intelligence, image processing and other technologies, the performance and functionality of CCTV lenses will continue to improve, and their application fields will continue to expand.According to data from market research companies, the global CCTV lens market is expected to continue to grow in size in the coming years. Among them, the demand for CCTV cameras in emerging markets such as China and India is expected to grow faster than other markets. In addition, with the rapid development of smart homes, smart security and other fields, the CCTV lens market will also benefit from these trends.Therefore, overall, the CCTV lens market has broad prospects, but enterprises also need to continuously improve product quality and technical level to adapt to market demand and industry changes.  

Wide shooting range: The fisheye lens has a very wide shooting range, capable of shooting large scenes, vast landscapes, etc., with strong visual impact.Distortion effect: The distortion effect of a fisheye lens can make the image more exaggerated and interesting, producing a strong visual impact.Space compression: The space compression effect of the fisheye lens can bring the distant scenery closer, making the picture more compact and conducive to expressing the distant scenery and magnificent buildings.Suitable for shooting landscapes: Fish eye lenses are particularly suitable for shooting landscapes, capturing a wide range of scenes, representing natural landscapes such as the sky, clouds, mountains, and oceans.Unique shooting effect: The fisheye lens has a very unique shooting effect with a strong artistic sense, suitable for shooting creative photography, art works, etc.

CCTV lenses, also known as surveillance cameras or security cameras, are an important security monitoring equipment and are mainly used for security monitoring and image recording in various places. Here are some special features of CCTV footage:Multiple ways to shoot: CCTV footage can be shot in a variety of ways. For example, the lens can be fixed in a certain position for fixed-point shooting, or it can rotate in all directions, or even perform continuous shooting from multiple angles. These functions can be realized through corresponding control systems.Remote control: CCTV lenses are usually equipped with corresponding remote control systems. Users can remotely control the lens through remote control, computer or mobile phone and other devices, including adjusting the angle, focal length, brightness and other parameters of the lens, and can also view the shooting in real time. image or video.Image processing and recognition: Modern CCTV cameras are usually equipped with high-resolution image sensors and image processing chips that can process and recognize the captured images. For example, the lens can detect important information such as faces, body movements, license plate numbers, etc., and automatically identify and classify them. These features can help users better understand the conditions and anomalies in the monitored area.Motion detection and alarm: CCTV cameras can detect moving objects and automatically alarm. The system will automatically identify moving objects or people and immediately send out an alarm signal, while also sending images or videos to the designated mailbox or police department.Multiplatform compatibility: Modern CCTV lenses are compatible with multiple platforms, such as PCs, mobile phones, tablets and other devices. Users can watch in real time or record video playback in a variety of ways.To sum up, CCTV lenses have a variety of special functions that can help users better understand the conditions and abnormalities in the monitored area and improve safety and work efficiency.

AVM is a panoramic image system, namely Automotive Around View Monitor/Surround View Camera.It is another great helper for safe driving and can realize driving without blind spots.Images are captured through multiple ultra-large wide-angle fisheye lenses, and then the captured images are distorted and spliced through data processing to form surrounding images.It is mostly used in automobile systems to provide the driver with a bird's-eye view of the surroundings of the car body, eliminate the driver's blind spots, and provide effective visual assistance when parking.In fact, surround view systems can be divided into monocular, binocular and multi-view systems.Among them, the monocular and binocular systems must establish a virtual coordinate system while the vehicle is moving to draw a panoramic image to guide parking. The multi-view system can directly guide parking.⁉ So how many cameras are needed for the entire operation process?✔ 360-degree panoramic camera, 360-degree panoramic imaging system, 360-degree panoramic parking system, 360-degree panoramic vision system, and 360-degree panoramic reversing system simultaneously collect images around the vehicle through 4 ultra-wide-angle cameras installed on the front, rear, left, and right of the vehicle.✔ Through Pujieli's proprietary "real-time image distortion restoration docking technology", the image is processed through distortion restoration, perspective conversion, image splicing, and image enhancement, and finally forms a seamless and complete panoramic bird's-eye view of the car's surroundings.✔ The system can not only display a panoramic view, but also display a single view in any direction at the same time; the driver can accurately read the location and distance of obstacles by matching the ruler lines.  

The technical principles of car mounted surround lenses mainly include the following aspects:Lens design: Car surround photography typically uses multiple cameras, which are distributed around the vehicle to provide a more comprehensive view. The design of a lens needs to consider various factors, such as the focal length, aperture, angle of view, etc., in order to obtain high-quality images during the shooting process.Shooting method: The shooting method for car surround lenses includes two aspects: hardware and software. Hardware includes cameras, brackets, power supplies, etc. It is necessary to choose high-quality equipment to ensure the stability of shooting. In terms of software, post production requires professional image processing software to fuse and concatenate images captured by multiple cameras to form the final surround lens image.Post processing: After the shooting is completed, it is necessary to perform post processing on images from multiple cameras in order to fuse them into a complete image.