IMAGE DATA ENCODING AND DECODING

摘要

A method of operation of an image data encoding apparatus comprises in respect of a coding unit comprising an array of data samples of a current image, dividing the coding unit into two or more prediction units; and for each prediction unit, detecting a motion vector pointing to an array of samples for use in generating a predicted version of the samples of that prediction unit so that the source samples applicable to each prediction unit are displaced, with respect to that prediction unit, by a displacement within an allowable range of displacements; in which the detecting step comprises detecting a motion vector in respect of a predetermined subset of the prediction units of a coding unit so that the source samples pointed to by each motion vector in that subset of the motion vectors are displaced, with respect to one or more other prediction units of that coding unit, by a displacement within the allowable range of displacements.