G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
G09F19/00—Advertising or display means not otherwise provided for
G09F19/12—Advertising or display means not otherwise provided for using special optical effects
G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds
Procedure et dispositif pour projeter et observer des images differenciees ou stereoscopiques, dessins, photographies, films cinematographiques ou video
Procede et systeme de formation et de projection d'images permettant d'obtenir la reduction et la reproduction d'un espace en restituant la visualisation integrale du relief