Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Patent
1996-07-09
2000-02-29
Fetting, Anton
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
G06T 1700
Patent
active
060315385
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for the generation of synthetic images, especially for the generation of image sequences.
The field of the invention is that of image synthesis by computer, namely the synthesis of monocular images for display on conventional screens and binocular or stereoscopic images for display in relief in virtual image type applications.
The aim of such methods is to reduce the cost of computation of the image sequences generated.
2. Discussion of the Background
In the known approaches, the volume of computations required is reduced by a limiting, done homogeneously in the temporal and spatial domains, of the information elements processed by a rendition algorithm that enables the preparing of a 2D image on the basis of structural data modelling the 3D scene to be displayed. The diminishing of computation costs then occurs inevitably to the detriment of the realism of the sequence thus generated.
The next step in the reduction of computation costs, which is also a known one, is a temporal interpolation that recreates intermediate images from key images, which are the only images computed on the basis of the rendition algorithm. The generation of such images is generally based on the use of velocity vectors computed from one image to the next one by means of these images and is therefore based on an estimate of the displacement of the pixels of the image.
In all these cases of interpolation, whether they are simple repetitions of images or entail methods of greater complexity such as space/time filtering operations, there are jerking and echo effects. These effects arise out of the fact that neither the individual motion of objects in the scene nor the motion of the observation point is taken into account. The temporal interpolation generates "estimated" images which are therefore not always of good quality.
SUMMARY OF THE INVENTION
The present invention is aimed at reducing such deterioration of synthetic images.
To this end, and according to the invention, there is proposed a method for the generation of synthetic images from structural data modelling a 3D scene to be displayed and data representing an apparent relative evolution of the scene with respect to a viewpoint, the structural data enabling the computation of the co-ordinates of points of the 3D scene and the data on the evolution of the scene enabling the computation of the coefficients of geometrical transformation associated with these points, at which there is generated, on the basis of the structural data and a rendition algorithm, a 2D image representing the scene seen from this viewpoint, characterised in that, with each point of the 2D image there is associated a corresponding point of the 3D image and a motion vector representing the displacement of this point of the image due to the apparent evolution of the corresponding point of the 3D scene with respect to the viewpoint, said motion vectors of the pixels of the image generated having been computed on the basis of the co-ordinates and coefficients of the associated points of the 3D scene in order to use them in the generation of at least one other 2D image on the basis of the first image, and then the generated images are shown on a display screen.
An object of the invention is also the use of fields of reverse apparent velocity vectors for the temporal interpolation and of fields of disparity vectors for an extrapolation of an image generating a stereoscopic pair of images. An object of the invention is also the generation of a stereoscopic sequence on the basis of the extrapolation and interpolation vectors.
The invention therefore relates to the generation of monocular sequences as well as stereoscopic sequences.
The advantages obtained through this invention are a reduction of the cost of computing an image or a sequence of monocular or stereoscopic images, improved image quality and therefore high realism of the scene by means of a more reliable and simpler computation of the temporal interpo
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Blonde Laurent
Bordes Philippe
Chupeau Bertrand
Dusseux Jean-Christophe
Fetting Anton
Thomson Broadband Systems
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