Abstract: The invention relates to a process for compressing digital data of a sequence of synthesis images describing a scene which is the subject of a script, comprising a processing step for modelling the scene on the basis of mathematical data, a step of image rendering for creating a synthesis image from this modelling and a partitioning of this synthesis image into image blocks, differential coding of the current image block on the basis of a block of at least one synthesis image, this block being defined on the basis of at least one motion vector, so as to provide a residual block, characterized in that the motion vector is calculated from mathematical data emanating from the synthesis script and defining the apparent motion of the various objects constituting the scene which is the subject of the sequence. Applications are image synthesis in production. For video games, these are for example interactivity or virtual reality applications.

Abstract: The invention relates to a process for coding digital data from a sequence of video images carrying out a coding of the difference in luminance (7) between an image segment to be coded and a corresponding segment of an image predicted from a so-called reference image, characterized in that the prediction is made as a function of a luminance compensation (12) of values of luminance of the reference image. The field is that of the compression of digital video data.

Abstract: The invention relates to a process for coding digital data from a sequence of video images carrying out a coding of the difference in luminance (7) between an image segment to be coded and a corresponding segment of an image predicted from a so-called reference image, characterized in that the prediction is made as a function of a luminance compensation (12) of values of luminance of the reference image.

Abstract: The generation of images is done by the computation of the motion vectors representing the evolution from one image 2D to the other, directly from the co-ordinates and coefficients of geometrical transformation, of associated points in the 3D scene. The applications relate to the generation of monocular sequences by temporal interpolation and of stereoscopic sequences by extrapolation.

Abstract: A method of generation of computer images of a three-dimensional scene constituted by a set of facets, viewed from a point of observation along a viewing axis. The facets are projected on the surface of a sphere whose center is the point of observation of the scene and wherein the surface of the sphere is divided in a special way into elementary surfaces, each corresponding to a pixel on the spherical surface, in such a manner that the orthogonal projections of the elementary surfaces on a reference plane passing through the point of observation and perpendicular to the viewing axis of the scene all have same value. An application is the generation of visibility or distance images. Another application is radiosity.