Prediction of a movement vector of a current image partition pointing to a reference zone that covers several reference image partitions and encoding and decoding using one such prediction

摘要

A method and apparatus are provided for predicting a movement vector of a current image partition in relation to a movement vector of a reference partition having the same form as the current image partition and belonging to a reference image (IN-1) which is different from the current image and has been pre-cut, following encoding and subsequent decoding, into a plurality of n partitions. One such method includes, when the reference partition covers a set of k reference partitions from among the plurality of n reference image partitions, with k≦n, determining the movement vector of the current image partition from a function of at least one reference movement vector belonging to a set of k reference movement vectors associated respectively with k covered reference partitions.

主权项

1. A method comprising:
predicting a motion vector of a current image partition of a current image with respect to a motion vector of a reference partition having the same shape as said current image partition and belonging to a reference image which is different from the current image and which has been previously split, on completion of a coding followed by a decoding, into a plurality of n partitions, and in a case where said reference partition overlaps a set of k reference partitions from among said plurality of n partitions of the reference image, with k≦n, determining with a prediction device said motion vector of the current image partition on the basis of a function of at least one reference motion vector belonging to a set of k reference motion vectors associated respectively with the k overlapped reference partitions, in which determining the motion vector of the current partition comprises: selecting a particular point at the center of the reference partition that overlaps said set of k reference partitions, wherein the particular point minimizes the sum of the distances with respect to all the points of the reference partition; and selecting the reference motion vector associated with the overlapped reference partition which contains the particular point selected.