Method for compressing and encoding three-dimensional meshed...

G - Physics – 06 – T

Patent

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G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/36 (2006.01)

Patent

CA 2346342

The invention concerns a method for encoding a digital image for producing a bit stream representing said image, the bit stream length depending on the quality of the desired representation, characterised in that it consists in: a) defining, on the domain of the image to be encoded, a hierarchical meshing comprising a plurality of nested meshes whereof the mesh peaks are said image pixels; b) determining, for each mesh of said hierarchical meshing, a brightness variation between the image to be encoded and an interpolated image obtained from the nested meshing peaks whereto pertains the mesh concerned; and c) inserting in the bit stream position, brightness and chrominance values of the peaks of meshes whereof the brightness variation is higher than a threshold variation. The invention is useful for encoding fixed or animated images with speed reduction (compression).

La présente invention concerne un procédé de codage d'une image numérique visant à produire un train binaire représentatif de ladite image, la longueur du train binaire étant fonction de la qualité de représentation voulue, caractérisé en ce qu'il comporte les étapes suivantes: a) définir, sur le domaine le l'image à coder, un maillage hiérarchique comportant une pluralité de maillages emboîtés dont les sommets de mailles sont des pixels de ladite image; b) déterminer, pour chaque maille dudit maillage hiérarchique, un écart de luminance entre l'image à coder et une image interpolée obtenue à partir des sommets du maillage emboîté auquel appartient la maille considérée; et c) introduire dans le train binaire les valeurs de position, de luminance et de chrominance des sommets des mailles dont l'écart de luminance est supérieur à un écart seuil. Applications : domaine du codage d'images fixes ou animées à réduction de débit (compression).

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