METHOD AND APPARATUS FOR ENCODING AND DECODING BASED ON MOTION ESTIMATION

摘要

A method and an apparatus for encoding and decoding an image by using motion estimation are provided to predict the motion vector of a current block more accurately to reduce a differential between the motion vector and a predicted motion vector, thereby reducing the number of bits necessary for encoding information about the motion vector. A method for encoding an image by using motion estimation comprises the following steps of: searching for a reference picture by using pixels of a current block to generate a motion vector(510); searching for a reference picture by using pixels, which are adjacent to the current block and are previously encoded, to generate a predicted motion vector, the predicted value of the motion vector(520); and encoding the current block on the basis of the motion vector and the predicted motion vector(530).