Patent ID: 6795070
Filing Date: 2004-09-21
Classification: G06T,H04N

Abstract:
Method for coding a numerical image for producing a binary train representative of said image, the method comprising:a) defining on an area of the image to be coded a hierarchical meshing comprising a plurality of nested meshings, each nested meshing corresponding to one meshing level of said hierarchical meshing wherein each level of nested meshing is obtained by successive subdivisions of said area into a plurality of meshes having mesh tops representative of pixels of said image; b) determining for each mesh of said hierarchical meshing a luminance deviation between a corresponding pixel of the image to be coded and an interpolated value for the mesh in question obtained by interpolating luminance values of at least some of the mesh tops of the nested meshing to which the mesh in question belongs; and c) introducing into the binary train position, luminance and chrominance values of pixels corresponding to the mesh tops of the meshes whose luminance deviation is greater than a threshold deviation.