Imaging Modes And Applications of Fisheye Lenses
A fisheye lens is an extreme wide-angle lens that introduces barrel distortion to "compress and deform" the physical space, thereby obtaining an ultra-wide-angle image with a field of view of 180 to 270 degrees. Although there are large differences between the object and the image, the resolution is not affected, and the one-to-one correspondence between the object point and the image point can be guaranteed, so that a clear image over a large area can be achieved. To achieve the widest possible field of view, the front element of this type of lens protrudes forward in a parabolic shape—resembling a fish's eye—hence the name "fisheye lens." Most fisheye lenses are fixed focus lenses, with only a very small number being varifocal lenses. Due to their ultra-wide-angle characteristics, fisheye lenses play a significant role in fields such as astronomy, meteorology, forest fire prevention, and national defense. 1. The imaging principle of fisheye lenses The visua...