Isn't there a fish-eye lens on the Mi Gou camera?
The Migo Meteor +2 was a miniature camera with three functions: a motion DV camera and a driving recorder. It was not mentioned whether the lens was a fisheye lens. The Migo Meteor 3a was a motion camera, but it was not mentioned whether the lens was a fisheye lens. The Migo Meteor +3 was a motion camera. It was mentioned that it had a 170-degree wide-angle function, but it was not clear whether it was a fisheye lens. Based on the available information, it was impossible to determine if there was a situation where the Mi Gou camera was not a fisheye lens. Read more exciting novels for free
Fish-eye lens is
A fisheye lens was a lens with a focal length of about 6 - 16mm and a viewing angle close to or equal to 180°. It was a type of ultra-wide-angle lens. Its front lens was shaped like a parabola and protruded to the front of the lens, which was similar to the eyes of a fish, hence its name. The concept was proposed and developed in 1906. In the 1920s, it was used for the study of cloud formation in meteorology. Robin Hill was the first person to truly create a fisheye lens and use it for commercial use. Mass production began in the 1960s. It was usually composed of a front group of imaging lenses and a rear group of correction lenses. It was divided into half-frame fisheye lenses and full-frame fisheye lenses. It was first used in photography to create artistic photos with a large field of view and large distortion. It was also widely used in fields that required wide-angle imaging, such as surveillance, dome imaging, aerospace cameras, and other industrial, medical, and scientific research fields. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Is the fish-eye lens a concave lens or a concave lens?
Fish-eye lenses were usually composed of a front group of imaging lenses and a rear group of correction lenses. The front group of imaging lenses was generally a concave lens for imaging, but the entire fish-eye lens was a complex optical system. It was not only composed of simple concave lenses or concave lenses, but also through the combination of multiple lenses to correct aberrations, aberrations, and other problems to achieve its special imaging effect, such as the angle of view being close to or equal to 180°. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
computer fish-eye lens
A fisheye lens was a lens with a focal length of about 6 - 16mm and a viewing angle close to or equal to 180°. It was a type of ultra-wide-angle lens. Its front lens protruded toward the front of the lens in a parabola shape, similar to a fisheye. If a computer wanted to use a fisheye lens, it might be used for external cameras and other devices to achieve special shooting effects, such as creating artistic images with large field of view and large distortion. It could be used for creative photography, surveillance, or specific industrial, medical, scientific research, and other fields that required wide-angle imaging. Fisheye lenses were first used in photography. They were developed in 1906 and used to study the formation of clouds in the 1920s. They were mass-produced in the 1960s. They were divided into half-frame fisheye lenses and full-frame fisheye lenses. They were usually composed of a front group of imaging lenses and a rear group of correction lenses. At present, there were also a variety of fisheye lens products that were suitable for different camera mounts. While ensuring the image quality and other functions, they were also developing in the direction of light and portable. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Fish-eye lens for the seascape
The fisheye lens could be used to capture seascapes and had a unique imaging effect. For example, the AF-S fisheye Nikkor 8 - 15mm f/3.5 - 4.5E ED lens used three pieces of low-dispersion (ED) glass lenses to effectively reduce the horizontal color difference that caused the color halo. It could also achieve high sharpness and contrast at the edge of the image, which could provide good image quality for landscape photography (including seascape). The filter slot was located at the opening of the lens mount, which could be inserted after cutting the third-party filter insert on the market. It provides filter support for seascape shots. There was also a fish-eye lens suitable for shooting seascapes. Its maximum aperture was only f/8, and the viewing angle reached 162°. It used four sets of four optical structures, and the lens was coated with seven layers of RMC to effectively reduce ghostly shadows and glare. When using the fisheye lens to shoot the seascape, you can use its unique perspective. The closer the line to the edge, the more exaggerated the distortion. If you arrange some of the seascape elements that you want to highlight at the edge of the picture, you can exaggerate its distortion, thus forming a special picture effect. If you arrange the main body in the center of the picture, it will be more horizontal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Distortion correction of fish-eye lens
Fish-eye lens distortion correction aims to reduce or eliminate the image distortion effect caused by fish-eye lenses. When correcting the distortion of the fisheye lens, the core was to solve a "good" remap matrix, which rearranged some of the original image's pixel-points (or intervening points) and "pieced" them into a rectangular image."Good" was linked to the final requirement, and different tasks often used different correction/distortion solutions. For example, in the smart security industry, whether it was a monocular camera or a monocular camera, the images captured would have distortions, which was the same as the distortion correction principle of a fisheye camera. For monocular cameras, in order to obtain the corresponding relationship between the camera's coordinate system and the three-dimensional world coordinate system, the barrel distortion and pillow distortion of the camera needed to be corrected. For binocular cameras, in order to do epipolar line alignment and realize depth estimation, the output of the two cameras needed to be transformed into the same coordinate system. Teacher Zhang Zhengyou's chessboard correction method estimated the internal and external parameters and distortion coefficient of the camera through the position coordinates of the marker, and then calculated the remap matrix. This method had a good correction effect for monocular and binocular cameras. In terms of practical operations, fisheye correction can also be performed using python language (only relying on the opencv-python package and numpy package), and fisheye distortion correction can also be performed from code examples such as PILimport Image. In addition, the distortion correction function based on digital image processing was also applied to the fisheye lens correction. This solution required rearranging the arrangement of the elements, but for the ultra-wide system where the edge image quality itself was a big problem, it might lead to the image quality of the most edge area being worse. Some equipment would use the image field redundant design and the sensor to perform the redundant matching of the elements to reduce the side effects of the digital correction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Full circle fish-eye lens
The reference did not mention anything about the full round fisheye lens. Sorry, I don't know how to answer based on the information I found. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The field of view of a fish-eye lens
A fisheye lens was a lens with a focal length of about 6 - 16mm and a field of view close to or equal to 180°. It was a type of ultra-wide-angle lens with a field of view close to or equal to 180°. For modern optical applications, the field of view of the fisheye lens often needed to exceed 180 degrees. In this case, it was necessary to switch to a non-linear projection, introducing barrel distortion to project the hemisphere field of view onto a limited flat target. There were four main projection methods, namely, isomedic, isomedic, orthodoxy, and holographic. The most common was isomedic projection. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Fish-eye lens for piano teaching
Using a fish-eye lens in piano teaching has certain advantages. The fish-eye lens had a large angle of view and could accommodate more scenes. It could adapt to the needs of shooting in a small space. In a piano teaching scene, such as an online piano lesson, the fish-eye lens could be used to let students see more details of the teaching environment, such as the teacher's overall performance posture, the piano's overall appearance, and so on. However, there were some problems with using a fisheye lens. Due to the distortion of the image, the straight lines around the screen would be bent. When shooting piano teaching content, if you need to show some flat music score or the straight arrangement of the keys, there may be distortion. Therefore, when using it, one had to pay attention to the selection of the shooting angle and content. For example, the subject that needed to be highlighted (such as the teacher's hand movements, etc.) could be placed in the center of the lens because the straight line in the center of the lens could maintain its original state. This was also the brightest and clearest part of the photo to reduce the impact of distortion on the teaching content. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Fish-eye lens imaging theory
The imaging theory of the fisheye lens was based on its special optical structure design. The fisheye lens had a large spherical curvature, similar to the spherical crystal of a fisheye, and the imaging plane was closer to the lens. The visual effect was similar to a fish observing things on the surface of the water. When the fish was close to the surface of the water, the angle of view could reach a wide angle of nearly 180°. This phenomenon was based on the principle of total reflection and optical reversibility. In terms of structure, the front lens of the fish-eye lens protruded from the front in a parabolic shape in order to maximize the camera angle. It was generally believed that lenses with a focal length of 16mm or shorter were fisheye lenses. However, in engineering, lenses with a viewing angle of more than 140 degrees were collectively referred to as fisheye lenses. In fact, there were also lenses with a viewing angle of more than 270 degrees. In terms of imaging mode, the M12 fisheye lens (180°) generally used vertical or horizontal in-cut imaging mode (mode 1 Circular Fisheye, mode 3 Full Horizontal). At the same time, fisheye lens imaging relied on artificially introducing a large number of barrel distortions to obtain a large field of view, so that it could obtain image information with a large field of view. However, except for the shape of the object in the center of the image, the other parts that should be straight lines had a certain degree of distortion. When matching an image sensor with a fisheye lens, a 1:1 or 4:3 image sensor was generally selected to maximize the use of effective pixelation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Full-frame fish-eye lens
A full-frame fisheye lens was a type of fisheye lens. The fisheye lens was a type of ultra-wide-angle lens with a focal length of about 6 - 16mm and an angle of view close to or equal to 180°. Its front lens was shaped like a parabola and protruded toward the front of the lens. The functions of the full-frame fisheye lens included: 1. ** Photographic Creation **: Can create artistic photos with a large field of view and large distortion. It can display unique visual effects and shoot images with extremely wide angles of view. The effect of the images is beyond the regular and fixed forms that people see in their daily lives. 2. ** Industrial field **: In some industrial scenes that require wide-angle imaging, such as the monitoring field, it can cover a large monitoring range. 3. ** Scientific research **: It can be applied to the study of cloud formation in Meteorology. It can also be used in aerospace cameras to help obtain wide-angle image information. 4. ** Medical field **: Able to provide wide-angle imaging in specific medical imaging scenarios. 5. ** In terms of imaging, a full-frame fisheye lens can meet the requirements for scenes that require large viewing angles, such as dome imaging. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>