Abstract: A method for determining values of the intrinsic and extrinsic parameters of a camera placed at the edge of a roadway, wherein the method includes: a step of detecting a vehicle passing in front of the camera; a step of determining, from at least one 2D image taken by the camera of the vehicle detected and at least one predetermined 3D vehicle model, the intrinsic and extrinsic parameters of the camera with respect to the reference frame of the predetermined 3D vehicle model or models so that a projection of said or one of said predetermined 3D vehicle models corresponds to said or one of the 2D images actually taken by said camera. A method for determining at least one physical quantity related to the positioning of said camera with respect to said roadway. It concerns systems designed to implement methods. Finally, it concerns computer programs for implementing said methods.

Abstract: A method for recognizing a graphic element of technical function which is printed on a play slip (10) is based on a comparison of images. The content of an area (30) of the slip in which the graphic element is printed, is compared to reference images. The method is compatible with any mode for printing the graphic element on the slip: alphanumeric codes, barcodes, logos, pictures which vary according to the game, etc., but only uses one recognition algorithm. The graphic element which is recognized may be any graphic element of technical function, including a graphic element of useful data, in particular a game code (3) or a game symbol, or a reference graphic element for determining a position of the slip.

Abstract: The present invention concerns a method for synchronising several cameras with each other in a photographic system designed to take a multiple view of a scene, said cameras being of the CCD or CMOS digital type. According to the invention, said method comprises the steps of: illuminating said scene by means of a lighting system the lighting intensity of which varies periodically, and setting each of said cameras in a so-called anti-flicker mode where they are themselves synchronised by phase locking on the variations in light intensity of the lighting system. The invention also concerns a photographic system for implementing said method.

Abstract: The present invention relates to a device (4) for positioning the face of a user relative to an image-capture apparatus (1), the positioning device comprising a picture-taking device (7) arranged to supply horizontally-reversed images, a display screen (5) for displaying the reversed images and connected to the picture-taking device, and means for superposing on the images displayed on the screen at least one positioning reference mark (6) for the user, the positioning reference mark and the displayed images lying substantially in the same plane. The invention also provides a corresponding method and image-capture apparatus.

Abstract: The present invention relates to a device (4) for positioning the face of a user relative to an image-capture apparatus (1), the positioning device comprising a picture-taking device (7) arranged to supply horizontally-reversed images, a display screen (5) for displaying the reversed images and connected to the picture-taking device, and means for superposing on the images displayed on the screen at least one positioning reference mark (6) for the user, the positioning reference mark and the displayed images lying substantially in the same plane. The invention also provides a corresponding method and image-capture apparatus.