Abstract: A structure of a multipurpose card having a semi-transparent or transparent stone is provided. The stone is a faceted precious stone, such as a diamond. The diamond is illuminated from only one side of the multipurpose card and light is passed through predetermined optical paths. An image of the diamond is acquired from the opposite side of the multipurpose card and compared to predetermined reference images of the diamond, to authenticate the multipurpose card.

Abstract: A structure of a multipurpose card having a semi-transparent or transparent stone is provided. The stone is a faceted precious stone, such as a diamond. The diamond is illuminated from only one side of the multipurpose card and light is passed through predetermined optical paths. An image of the diamond is acquired from the opposite side of the multipurpose card and compared to predetermined reference images of the diamond, to authenticate the multipurpose card.

Abstract: A method for the recognition of stereoscopic glasses, wherein two images of an environment in front of a screen are acquired from the same point of view. A differential image is then calculated by subtracting one of the two images from the other one, and the presence of two lenses is detected within the differential image. A method is also provided for controlling the display of stereoscopic images by using the method for the recognition of glasses. Also described are the devices allowing the methods to be implemented.

Abstract: A system (1) for displaying a stereoscopic video stream includes a display device (3) for displaying the video stream in a stereoscopic or monoscopic mode. The system also includes stereoscopic glasses (2) for watching in stereoscopic mode the video stream displayed by the display device. The stereoscopic glasses (2) include a sensor (20) which detects the presence of a head when the glasses (2) are being worn, and a transmitter (21) which transmits to the display device (3) a piece of information indicating that the glasses are being worn. The display device (3) receives the piece of information transmitted by the stereoscopic glasses (2) and displays the stereoscopic video stream in monoscopic or stereoscopic mode as a function of the piece of information received.

Abstract: A system and a method for encoding and decoding stereoscopic images are described. A stereoscopic image comprises at least two sub-images arranged according to a first configuration and intended for a user's right eye and left eye, respectively. During the video signal post-production stage, a chromatic code is embedded which in adapted to provide information about said configuration. At receiver level, decoding means (14) are used which are adapted to receive said stereoscopic image, recognise the configuration of said at least two sub-images based on information embedded into said stereoscopic image, and arrange said at least two sub-images according to a second predetermined configuration.