MOTION VECTOR CODING METHOD AND APPARATUS BY USING PARTITIONING SPACE AND VIDEO CODING METHOD AND APPARATUS USING SAME

摘要

The present invention relates to a method and apparatus for encoding/decoding a motion vector using spatial division, and to a method and apparatus for image encoding/decoding using the same. According to the present invention, a motion vector encoding method is provided which includes the steps of: aggregating predicted motion vector candidates of a current block into a plurality of groups which include at least one predicted motion vector candidate; selecting representative predicted motion vectors for respective groups by comparing aggregated predicted motion vector candidates within the respective groups respectively and selecting one predicted motion vector as representative predicted motion vector; selecting single representative predicted motion vector from the representative predicted motion vectors for the respective groups as a predicted motion vector; and encoding a differential vector representing difference between a current motion vector of the current block and a selected predicted motion vector. The present invention suppresses an increase in bit rate caused by encoding side information for indicating which predictor motion vector is selected while reducing the size of the differential vector to be encoded, so that the coding efficiency of the motion vector may be improved, thereby improving the compression efficiency.