MOTION VECTOR ENCODING/DECODING METHOD AND APPARATUS AND VIDEO ENCODING/DECODING METHOD AND APPARATUS

摘要

PURPOSE: A motion vector encoding method, a device thereof, and an image encoding or decoding method using the same are provided to improve compression efficiency by reducing a bit rate for encoding information for a predicted motion vector. CONSTITUTION: A predicted candidate selector (210) selects motion vector prediction candidates. A predicted motion vector determiner (220) determines a predicted motion vector from the motion vector prediction candidates A differentiating vector encoder (230) encodes differentiating vector by deducting the predicted motion vector from a current motion vector. The predicted candidate selector comprises a module for selecting a first motion vector prediction candidate and another module selecting a second motion vector prediction candidate in a right lower end block corresponding to a current block in a reference frame. [Reference numerals] (210) Predicted candidate selector; (220) Predicted motion vector determiner; (230) Differentiating vector encoder; (240) Flag encoder for identifying a predicted candidate; (250) Flag encoder for selecting a predicted candidate; (AA) Present frame & a reference frame; (BB) Encoded differentiated vector; (CC) Flag for identifying an encoded predicted candidate; (DD) Flag for selecting an encoded predicted candidate