The invention relates to a device for determining a landscape sight distance comprising a camera (12) for photographing said landscape picture, means (16) for recording said picture, means (16) for assigning a representative information of a distance between the landscape point corresponding to the pixel and the camera to each picture pixel, thereby obtaining a distance map, means (20, 22, 24) for processing the picture in such a way that it is possible to detect the picture pixel whose contrast is greater by a predetermined value than at least certain adjacent pixels, means (20, 22, 24) for successively applying said detection processing to the picture pixels beginning from a pixel corresponding to a larger distance to a first pixel which is detected as satisfying the contrast condition and means (20, 22, 24) for assigning distance information to said pixel from the distance map.