A landing aid device for an aircraft generates video images of a portion of the field of vision using a sensor situated in front of the aircraft intended for picture-taking during poor visibility conditions, and extracts contours from the video images making it possible to delimit at least one first known shape included in each image. A first head up display includes a display zone, which occupies a portion of the visor of the cockpit superimposed on the exterior landscape, and a symbology for generating information representing symbols intended to aid piloting is displayed on the display, wherein at least one first symbol comprising landing aid information is generated on the basis of the contours of the first shape and displayed on the display.