1. A method for generating a perspective image, comprising: obtaining length, height and a vanishing point of a required perspective image and length and height of an original image; determining, for each of pixel points (x′, y′) in the perspective image, coordinates (x, y) of a pixel point in the original image corresponding to the pixel point (x′, y′), according to the length, the height and the vanishing point of the perspective image and the length and the height of the original image; and duplicating the pixel point on the coordinates (x, y) in the original image onto a location in the perspective image corresponding to the coordinates (x′, y′).