Coding scheme for a data stream representing a temporally varying graphics model

Abstract

Introducing a further prediction stage, namely a prediction of the motion vectors or the prediction error of the first prediction stage, does indeed at first increase the encoding or compression effort and, correspondingly, also the decoding or decompression effort, but the prediction proposed here leads to a significant improvement of the compression gain in relation to the effort in most graphics model sequences due to the uniformity of the motion.

Description

technical field [0001] The present invention relates to the encoding and decoding of a data stream representing a time-varying graphical model, and in particular to the compression of the graphical model data. Background technique [0002] Today, time-varying 3D computer graphics models are widely used in the field of classical computer graphics. For example, 3D computer graphics models are used in games, virtual worlds, animation, etc., but also in the latest systems called Free Viewpoint Video (FVV) or 3D Video Objects (3DVO). [0003] A 3D computer graphics model describes the surface of a 3D object in a virtual 3D coordinate system. For this, the 3D coordinates (x, y, z) of a certain number of control points or vertices lying on or arranged along the surface are defined. Continuous surfaces are defined by different parameterization methods. For example in a parametric method known as polygon mesh, the shape of the surface of a 3D object is defined by polygons, where t...

AI Technical Summary

Problems solved by technology

The disadvantage of such animation models is that they cannot be translated to the general case, i.e. they are limited to special motion sequences and / or special objects, such as faces, etc.

If no animated model exists, then at each moment will have to be passed a new 3D model or a new mesh of control points, which is then encoded with MPEG-43DMC at each moment, but since at each moment it is the same Objects are in motion, so the data also contains a lot of temporal redundancy, which can be used for further compression

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