Abstract: The installation comprises a roadway having at least some segments provided with longitudinal reference marking (10) for a nominal path, and vehicles (18) each carrying an assembly providing guidance by controlling a steering axle, having a module for forming an image of the road ahead of the vehicle (18) and for processing the image of the marking, and an optical guidance module calculating the orientation to be given to the wheels of the steering axle to follow the nominal path, and a steering servo-motor controlled by the guidance module. At at least certain segments of the road carry lateral guides (14, 16) and the vehicles, whose front axles at least are steering axles, are provided on each axle with vertical-axis guide wheels (24) designed to press against the guides (14, 16) in the event of the vehicle departing excessively from a nominal path on the road.

Abstract: A process modification of the content of a sequence of images which can be represented as a matrix of pixels. For that purpose a non-deformable target zone to be replaced in the scene is identified and is characterized, both in position and in dimensions, by reference to marks located close to each other and connected to the target zone in each image. The position with respect to the marks to be assigned to a model which can be superimposed on the target zone, stored in digital form, is determined. For each particular image, the geometrical transformation to be carried out on the model so that it corresponds to variations in the appearance of the target zone in all the successive images in the same shot is determined automatically using a correlation calculation based on the marks. Data suitable for enabling replacement of each current representation of the target are derived from the transformation and output. Apparatus for carrying out the method is also described.

Abstract: The process makes it possible to modify the content of a sequence of images which can be represented as a pixel matrix. For that a non-deformable target zone to be replaced in the images is identified and is characterized, both in position and in dimensions, by reference to marks located close to each other and having an unchanging geometrical relation with the target zone in each image. The position, with respect to the marks, to be assigned to a model or pattern which can be superimposed on the target zone, stored in digital form, is determined. For each particular image of a same shot the geometrical transformation to be carried out on the model so that it corresponds to variations in the appearance of the target zone in all the successive images in the same shot is determined automatically by a correlation based on the marks. Last the pixels representative of the model are substituted for the pixels representative of the target zone in the image.