Abstract: A method comprising emission periods during which a predetermined emission voltage, which presents a first polarity, is applied and sustained at the control terminal of at least one driver of said panel, and depolarization periods during which a predetermined depolarization voltage, which presents a second polarity, opposite to the first polarity, is applied and sustained at the control terminal of at least one driver of said panel, the address signals of the circuits of said panel being transmitted by capacitive coupling of the address electrodes to the control terminals of these circuits. The invention makes it possible to use conventional and inexpensive means of controlling the address electrodes.

Abstract: Method to display an image using four or more primaries having different spectral distributions that are distributed into three groups of primaries, wherein, in a visual color space, all primaries belonging to the same group have the same visual color and are metamehc. Each image being got from a combination of three primary images and each primary image being associated with each visual color of a group, the different primaries of each group are spatially or sequentially distributed over the primary image associated with this group, then allowing an efficient anti-copy protection based on metamerization of images, without any supplemental video processing.

Abstract: The invention relates to a projection system for displaying at least one visual image based on three primary colors, comprising a signal processing unit for converting said visual image into at least a visual image based on four primary colors, a frequency band being associated to each color primary, first display means for displaying three first primary colors of said visual image on a screen and second display means for displaying at least the fourth primary color of said visual image on said screen. According to the invention, the system further comprises optical filtering means that are adapted to enhance the separation between the frequency spectrum of the first three primary colors of the first display means and the frequency spectrum of the at least fourth primary color of the second display means. Application to anti-camcorder systems.

Abstract: The present invention relates to a method for displaying an image in an active matrix display device and more particularly in an active matrix OLED (Organic Light Emitting Display) display. The purpose of this invention is to increase the video dynamic range of each color component. The voltages applied to the OLED cells are based on reference voltages or currents. According to the invention, a different set of reference voltages is used for each color component. To this end, the video frame is divided into at least three sub-frames and at least one color component of the picture is addressed during each subframe with a set of reference voltages adapted to said color component.

Abstract: A method to display images using four or more different primaries having different spectral distributions wherein, in the LMS color space, at least two of these primaries have the same L coordinates and the same M coordinates; thank to the invention, different metamers, when being legally displayed, will be not only perceptually indistinguishable to a viewer with normal color vision but also indistinguishable by most of the viewers with non-normal color vision.

Abstract: Method in which a component image associated with a primary colour of green hue is processed in a suitable manner to reduce the spatial frequencies corresponding to the transition zones in this component image and in which a plurality of component images including the processed component image are successively displayed. Thanks to the invention, the colour break-up defects are noticeably reduced. The invention applies especially to anti-piracy image display methods.

Abstract: Panel comprising display drivers which, each 1??, comprise a select switch and a clamping switch which are controlled by the same select electrode, and a coupling capacitor for transiently coupling the control terminal of this circuit C to an address electrode. A control method comprising emission periods and depolarization periods, where all the address signals have the same polarity. The invention makes it possible in particular to use conventional and inexpensive means of controlling the address electrodes.

Abstract: The invention relates to a method for combating the copying of source pictures by means of a camera while they are being displayed, for example using a camcorder in a movie theatre. To this end, it is known, in classical projection systems, to modulate by a carrier wave the brightness of some pixels of the pictures. The frequency of the carrier wave is usually constant and generally half the refresh frequency. The main problem with such systems is that once a pirate has figured out what the modulation frequency is, he can configure his camcorder shutter to filter out this frequency and bypass the anti-camcorder method. According to the invention, the frequency of the carrier is changed at least once throughout the displaying of the sequence pictures or the movie, to defeat all camcorders standards (PAL/NTSC) and shutter configurations.

Abstract: The invention relates to a method for displaying a settings menu. In order to optimize the graphical representation of setting carried out by a spectator, the method comprises steps for: displaying said settings menu comprising a three-dimensional graphical element of which one of the dimensions extends according to a depth direction (z), displaying, on said graphical element, of at least one setting representative of at least one item of depth information.

Abstract: A method for characterizing a color reproduction device. A first output color measure responding to a first reference input color value is measured under normal measurement conditions. The measurement conditions are modified and a second output color measure responding to the first reference input color value is measured under the modified measurement conditions. A transformation rule, enabling transformation between the second output color measure and the first output color measure, is calculated from the first color value and the second color value. A first set of output color measures responding to a set of input color values is measured under modified measurement conditions, and the first set of output color measures is converted, using the transformation rule, to a second set of output color measures. A system and a control device are also provided.

Abstract: The invention relates to an image display device with active matrix comprising a number of light emitters forming a network divided into rows and columns; a current modulator for each emitter; and at least one inverse bias voltage generator. This device is characterized in that it also comprises: an inverse bias switch for each emitter, said inverse bias switch being connected, on the one hand, to each modulator and, on the other hand, to the or each inverse bias voltage generator; and control electrodes able to drive all the inverse bias switches of a row of emitters. The invention also relates to a method of driving this device.

Abstract: To generate a rising or falling edge simultaneously on the electrodes Ys and Ysa of a plasma display cell, the invention provides for the use of the power recovery circuit of the control device in order to apply, to one of the electrodes Yas and Y, the rising edge applied to the other of the electrodes by a dedicated circuit.

Abstract: The invention relates to a method of processing source images which is intended to combat their copying by a camcorder or a camera during their display, for example in a cinema hall. The source image sequence represents a scene. According to the invention, the method comprises the following steps: detection, in the said scene, of at least one zone corresponding to an object of the scene, selection of the entirety of the pixels of the said at least one zone in at least one source image of the sequence; and processing of the said at least one source image to modify the colour of the selected pixels or the spectral composition of the light emitted by the selected pixels so that the perceived colour of the selected pixels is unchanged in the processed source image with respect to the source image.

Abstract: A method to display images using four or more different primaries having different spectral distributions wherein, in the LMS color space, at least two of these primaries have the same L coordinates and the same M coordinates; thank to the invention, different metamers, when being legally displayed, will be not only perceptually indistinguishable to a viewer with normal color vision but also indistinguishable by most of the viewers with non-normal color vision.

Abstract: The invention relates to a projection system for displaying at least one visual image based on three primary colours, comprising a signal processing unit for converting said visual image into at least a visual image based on four primary colours, a frequency band being associated to each colour primary, first display means for displaying three first primary colours of said visual image on a screen and second display means for displaying at least the fourth primary colour of said visual image on said screen. According to the invention, the system further comprises optical filtering means that are adapted to enhance the separation between the frequency spectrum of the first three primary colours of the first display means and the frequency spectrum of the at least fourth primary colour of the second display means. Application to anti-camcorder systems.

Abstract: The invention relates to a method for combating the copying of source pictures by means of a camera while they are being displayed, for example using a camcorder in a movie theatre. To this end, it is known, in classical projection systems, to modulate by a carrier wave the brightness of some pixels of the pictures. The frequency of the carrier wave is usually constant and generally half the refresh frequency. The main problem with such systems is that once a pirate has figured out what the modulation frequency is, he can configure his camcorder shutter to filter out this frequency and bypass the anti-camcorder method. According to the invention, the frequency of the carrier is changed at least once throughout the displaying of the sequence pictures or the movie, to defeat all camcorders standards (PAL/NTSC) and shutter configurations.

Abstract: Method to display an image using four or more primaries having different spectral distributions that are distributed into three groups of primaries, wherein, in a visual color space, all primaries belonging to the same group have the same visual color and are metamehc. Each image being got from a combination of three primary images and each primary image being associated with each visual color of a group, the different primaries of each group are spatially or sequentially distributed over the primary image associated with this group, then allowing an efficient anti-copy protection based on metamerization of images, without any supplemental video processing.

Abstract: Panel comprising display drivers which, each 1??, comprise a select switch and a clamping switch which are controlled by the same select electrode, and a coupling capacitor for transiently coupling the control terminal of this circuit C to an address electrode. A control method comprising emission periods and depolarization periods, where all the address signals have the same polarity. The invention makes it possible in particular to use conventional and inexpensive means of controlling the address electrodes.

Abstract: The spatial frequency analysis contained in the compressed image is used not only for decompression of images but also for the selection of an appropriate gamut mapping algorithm. Computation resources are then saved because no specific spatial frequency analysis is required for the selection of an appropriate gamut mapping algorithm.

Abstract: Method of displaying images on a projection screen in front of a place for an audience, by using different visually-equivalent metameric colors for different portions of images, and by simultaneously illuminating said place for the audience with perturbing infrared radiations and by simultaneously detecting any image capture device in the place for the audience, wherein: the different metameric colors that are visually-equivalent have different spectral wavelength distributions at least in the red region of wavelengths, detection is performed through the perturbing infrared radiations that are reflected by any object in the place for the audience. Such a system seems impossible to circumvent by pirates using camcorders.