Abstract: The invention relates to a method for image processing implementing a first step of alignment of at least two images representative of a same scene and having different colours, known as source image and target image respectively, delivering a first aligned image. According to the invention, such a method also implements: a second step of alignment of said source image and said first aligned image, delivering a second aligned image, a step of construction of a confidence mask, corresponding to an image identifying the regions in which said first aligned image is correctly aligned with said second aligned image.

Abstract: The invention relates to a method for processing a video image for a display device. In order to reduce the visibility of transition regions in the processed image, the method comprises a step of application of a third video pattern to at least one part of the image, the third video pattern resulting from the spatial interleaving of a first video pattern and at least one second video pattern according to a determined model.

Abstract: The present invention relates to a method for displaying a video image on a digital display device during a video frame comprising at least two distinct time segments for displaying a grey level. The cells of the device are able to take selectively an on state or an off state. The cells are able moreover to change state several times during a video frame. According to the invention, the cells change state at most once during each time segment of the video frame. The invention makes it possible to attenuate or suppress disturbances related to the temporal integration and to the sequential displaying of the R, G, B components of the video image.

Abstract: The present invention relates to a method of displaying a color video image in a sequential color display panel. The video frame is divided into a plurality of consecutive time segments each assigned to a given color component, and the video level of the pixels of the image is displayed by modulating the display time of the corresponding cells. The invention aims to propose a display method that reduces the blurring effect without causing color break-up. According to the invention, at least one reference time segment is defined in said plurality of time segments, and the image is displayed giving priority to lighting the cells during the reference time segment and the time segments closest to the reference time segment.

Abstract: The method comprises the following steps: detection of the static areas in the current picture, calculation of a histogram for the non-static areas of the current picture calculation of the difference between the histogram of a current picture and the histogram of at least one preceding picture, declaration of scene change if the difference is greater than a predetermined threshold. The applications related to video processing using picture movement such as up-conversion of video pace, reduction of motion compensated noise.

Abstract: The present invention relates to a method for detection of film mode or camera mode of a video sequence. This detection is carried out using histograms of video levels of frames of the video sequence. Difference histograms are calculated then compared with each other so as to generate difference parameters for each video frame of the sequence. The pattern formed by these difference parameters is then compared with predetermined patterns to deduce the mode, film or camera, of the sequence. The advantage of this method is that it requires just small memory resources for its implementation and can therefore be implanted in an FPGA circuit.

Abstract: A method and an arrangement for an improved outlier detection for colour mapping are recommended, wherein a neighborhood of a partially colour compensated test-image by comparing the initially corrected test-image with a reference image in a neighborhood comparator is used for outlier detection and not outlier detection of at least two images for colour mapping.

Abstract: The present invention is situated within the frame or video processing domain and more particularly in the domain of video interpolation. It relates to a device for generating an interpolated frame from source frames temporarily surrounding it. This device comprises motion estimation means, motion compensated interpolation means, linear interpolation means, means for mixing the frame produced by the motion compensated interpolation means with the frame produced by the linear interpolation means. According to the invention, the mixing coefficients assigned to these two frames depend on the displaced frame difference and/or the frame difference between the source frames surrounding this interpolated frame and/or estimated motion vectors.

Abstract: The present invention can be implemented in a video coder or decoder or directly in any type of display device. According to the invention, a distance representative of the edge orientation in the input picture is calculated, for at least one point situated inside a zone delimited by a first set of neighbouring pixels of the input picture, it is calculated independently from the grid of pixels of the output picture. For at least one pixel of the output picture situated in this zone, a second set of pixels is determined in the input picture from the distance and the position of said pixel of the output picture in this zone. The value of this output pixel is then determined from the value of the pixels of said second set of pixels. This method enables a reduction in the number of calculations for this format conversion.

Abstract: The invention proposes a motion compensated video interpolation that is not sensitive to the errors in the motion estimation vectors. The invention proposes a motion compensated video interpolation method in which the interpolation step varies according to the amplitude and/or a reliability index of the estimated motion vector for the considered pixel. The number of pixels to be taken into account for interpolation and the weighting factors associated with these pixels are made to vary according to the amplitude and/or reliability index of the estimated motion vector.

Abstract: The invention relates to a method for processing a video image for a display device. In order to reduce the visibility of transition regions in the processed image, the method comprises a step of application of a third video pattern to at least one part of the image, the third video pattern resulting from the spatial interleaving of a first video pattern and at least one second video pattern according to a determined model.

Abstract: The present invention relates to a video picture display method that aims to reduce the effects of blurring and multiple contours when the picture display frequency is doubled. According to the invention, for each source video picture, a video level dissymmetry is created between the two pictures from the source video picture after doubling the frequency in the areas in motion of the source video picture.

Abstract: Each color image is decomposed into at least one series of at least three successive primary images of different primary colors which are successively displayed by modulating the activation duration of the pixels of an imaging device. According to the invention, the distribution of the pixel activation phases in the three successive subframes is contracted: the pixel activation periods of the first primary image are shifted toward the end of the subframe of this first image, and, during the subframe of the third primary image, the pixel activation periods of this third primary image are shifted toward the beginning of the subframe of this third image. Color break-up faults are thus advantageously reduced.

Abstract: Device comprising: a rear panel comprising a network of backlighting elements, a front panel comprising a network of optical valves which are each capable of modulating the brightness of a single primary colour. By the modulation of chrominance which is added to the modulation of luminance for the backlighting elements of the rear panel, the device according to the invention makes it possible to display the images with even more contrast and better quality. A specific control mode makes it possible to avoid the colour “interferences”.

Abstract: The distances representative of the edge orientation at a current points of a video picture generated are particularly used for the deinterlacing or format conversion of video pictures. It can be implemented in a video coder or decoder. According to the invention, the distances representative of the edge orientation calculated are filtered with a conditional median filter applied to a window of p by q distances. This filter only takes into account the distances of points for which the local gradient module of the video components is greater than a threshold.

Abstract: According to the invention, the video data to be processed and the configuration data are transferred to the module via one and the same data bus. These modules are advantageously chained in series on a common bus which transfers to each module both the configuration data and the video data to be processed. Preferably, dead time or “blanking” periods between two picture frames transmitted on this bus are used in order to insert the configuration data.

Abstract: The invention relates to a method for video processing of at least one image of a video sequence, said video sequence comprising a plurality of image pairs, each image pair comprising a first image and a second image said first and second images being intended to form a stereoscopic image. In order to reduce display defects, the method comprises a step of generation of at least a third image by motion compensated temporal interpolation from at least two of said second images.

Abstract: To capture an image, the image sensing period of this image is subdivided into a plurality of successive illumination periods, and the value which is assigned to each pixel to capture the image is the sum of the integrals of intensity of illumination of this pixel over each of said successive illumination periods. According to the invention, this sum is weighted by an apodization function in order to emulate a mechanical shutter. Temporal aliasing issues and temporal ringing artifacts of digital imaging are prevented or at least limited.

Abstract: A display device comprises revolving coloured wheels, so as to generate a periodic coloured beam, and an imager which modulates the coloured beam as a function of a received video signal. The coloured beam (8) takes successively at each period a plurality of primary colours in synchronism with the images generated by the imager for each primary colour. By adjustment of the relative position of the coloured wheels, it is possible to modify the hue of the primary colours so as to best match them to the received video signal.

Abstract: The invention discloses modification of pixels of an image in such a way that the average of the colors of the pixel in the modified image equals the average of the colors of the pixel in the source image, such that the human perception of the modified image is the same as the source image, while a camcorder will record an unsatisfactory mixture of the modified colors.