1. A panoramic imaging system comprising: an image acquisition means for acquiring a wide-angle image using a fisheye lens rotationally symmetric about an optical axis; an image processing means for generating a panoramic image based on the said wide-angle image; and an image display means for displaying the said panoramic image on a rectangular screen, wherein; a coordinate of an image point on the rectangular screen corresponding to an object point having a coordinate (X, Y, Z) in a world coordinate system, which has a nodal point of the fisheye lens as an origin and a vertical line passing through the origin as the Y-axis and an intersection line between a reference plane containing the said Y-axis and the said optical axis of the fisheye lens and a horizontal plane perpendicular to the said vertical line as the Z-axis, is given as (x″, y″), a horizontal incidence angle Ψ, which an incident ray originating from the said object point makes with the said reference plane, is given as ψ = tan - 1 ( X Z ) , a vertical incidence angle δ, which the said incident ray makes with the X-Z plane, is given as δ = tan - 1 ⁡ ( Y X 2 + Z 2 ) , a lateral coordinate x″ of the said image point is given as x″=cΨ, herein, c is a proportionality constant, a longitudinal coordinate y″ of the said image point is given as y″=cF(δ), herein, the function F(δ) is a monotonically increasing function.