A fisheye lens is a lens giving a field of view of about 180 ∘ or larger.
The terms fisheye camera and fisheye view seem to have been introduced by Wood in 1906 . Wood was interested in the way a fish perceives objects outside the water. Besides studying the problem theoretically, he also built a camera that mimics the fisheye view. To do so, he immersed a pinhole camera in a casing filled with water and that had a glass plate as one of its faces, through which the camera could acquire images of the outside world. One basic observation Wood made is that since the camera looks from a denser medium (water) into a lighter one (air), its effective field of view is larger than its native one, due to the refraction happening at the interface between the media. This effect is related to the so-called Snell’s window. In particular, when looking from water into air and supposing that the water surface is still, the entire...
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