Adaptive motion vector field coding

摘要

A method for motion compensated encoding of video data. The method comprises the steps of: generating a motion vector field of video pixels of a current frame to be coded based on a reference frame; obtaining segmenting information defining the division of the current frame into image segments; coding the motion vector field of an image segment S_k to provide compressed motion information comprising a motion coefficient vector c_k comprising a set of motion coefficients c_i, such that c_i.f_i(x,y) represents the motion vector field, whereby f_i(x,y) defines a certain set of basis functions, wherein i is an index defining a correspondence between each basis function and a corresponding motion coefficient; predicting a motion vector field of a subsequent image segment S_L with a set of predicted motion coefficients p_i based upon the previously generated motion coefficient vector c_k; generating for the subsequent segment S_L a set of refinement motion coefficients r_i corresponding to the difference between the set of motion coefficients c_i and a set of predicted motion coefficients p_i such that p_i+r_i=c_i. Another aspects of the invention comprise corresponding video codec, mobile station, telecommunications network and computer program product.