Moving-map display with recording on photographic film

Claim 1

A moving-map display with recording of a map on a photographic film carried by spools, comprising: a video image reader using a line-by-line scanner which scans a map image formed on said film, a computer for generating position servo-control data to control scanning of the film image of the basis of heading, longitude and latitude parameters of a vehicle carrying the moving-map display, said computer comprising means for electronically correcting said servo-control data to take account both rotation due to the heading and translations in x transverse with respect to the film to be produced as a function of the longitude, as well as a servo-control in y of the film in the longitudinal direction by rotation of the spools as a function of the latitude, said film comprising successive images forming said recorded map, lateral perforations, and coded inscriptions between the perforations, said coded inscriptions corresponding to numbering of said images, said computer also comprising means for controlling said image reader to produce a cyclic lateral scan in y at the location of a row of said perforations to produce longitudinal position information and permit the calculation of fine resetting data in y to be transmitted to the servo-control based on the position of said perforations relative to said inscriptions, and displaying means comprising a cathode-ray indicator for displaying a corrected video image corresponding to the map image scanned by said reader based on the corrrected control data.