1. An electronic process, comprising: capturing an image of a scene using an image sensor, said captured image presenting a pincushion distortion relative to an undistorted image of said scene; and processing the captured image, the processing including correcting said distortion in the captured image based on an approximation of the pincushion distortion which satisfies the following equation for a given pixel in the captured image: 
 D =( R−R ′)/ R=Da *( y 2 −x 2 +y offset )+ Db*R 4 where D represents the approximation of said distortion, R is the distance between a pixel, which corresponds in the undistorted image of the scene to the given pixel in the captured image, and the center of the undistorted image of the scene, R′ is the distance between the given pixel of the captured image and the center of the captured image, Da and Db are respective distortion parameters of the image sensor, x and y are coordinates of the given pixel in an image coordinate system for the captured image, R satisfies the following equation: 
 R 2 =x 2 +y 2 and y offset corresponds to a constant value for each line of pixels in the image.