Patent ID: 6516093
Filing Date: 2003-02-04
Classification: G06T,H04N

Abstract:
A method of coding a sequence of pictures using a segmentation operation of each of said sequence of pictures followed by a coding operation of each of the obtained successive partitions, wherein, for each current partition considered with respect to the previous one, said method comprises:(1) an initialization step, by subdivision of a current picture into a mesh of blocks the nodes of which are located on high gradient points and by subdivision of the blocks of said mesh into two triangles; (2) a projection step, allowing to follow the time evolution of the sequence using a motion estimation operation, for associating displacement vectors to the nodes of each triangle, followed by a mesh definition operation, for defining a new mesh on the basis of motion of the nodes; (3) a mesh motion coding step, in order to create the next partition and to define a motion field allowing compensation of texture information, said compensation allowing to carry out a synthesis step of a prediction of the current picture, based on the knowledge of the motion of the nodes; (4) a segmentation and merging step, for an adaptation of the topology of the mesh to the evolution of a scene, said segmentation and merging step allowing to introduce new triangles in the mesh and to remove small or degenerated triangles; (5) a mesh update coding step; (6) a texture error detection and coding step.