1. A method for extending a visibility area obtained by means of a camera mounted on a vehicle, comprising: a step of generating a basic virtual image (I 2v ) in which a set of pixels of the basic virtual image is correlated with a set of pixels of a real image (I 1R ) captured by the camera while taking into account that the set of pixels of the real image reproduces a planar surface of the real world, a step of characterization of the basic virtual image (I 2v ) in which a set of points of interest of the basic virtual image (I 2v ) is generated; a step of building a cumulative virtual image (I 3v ) in which at least a portion of the basic virtual image (I 2v ) is superimposed on at least a portion of the cumulative virtual image (I 3v ) while coinciding points of interest of the basic virtual image (I 2v ) with points of interest of the cumulative virtual image (I 3v ); the building reiterated for each new basic virtual image (I 2v ) which is sufficiently different from a former basic virtual image (@I 2v ) in terms of distances between the points of interest; and a step of differentiating in which a difference is operated in terms of colour components between each pixel of the new basic virtual image (I 2v ) and a corresponding pixel of the former basic virtual image (@I 2v ) and in which there is attributed to the said pixel of the new basic virtual image (I 2v ) a transparency level which is a function of the said difference.