MOTION VECTOR EXTRACTING METHOD

摘要

PURPOSE: A motion vector extracting method is provided to extract a direct mode motion vector using temporal redundancy and spatial redundancy characteristics from a B-picture. CONSTITUTION: In a scheme in which a display order and a decoding order of moving pictures are different from each other, a sub-sequent picture is judged as a picture having temporal redundancy with a B-picture to be coded. It is checked whether or not a motion exists between the sub-sequent picture and the B-picture. When the motion exists, a direct motion vector is obtained with reference to a motion vector of the macro-block of the sub-sequent picture. When there is no motion between the sub-sequent picture and the B-picture, the direct motion vector is obtained with reference to a motion vector of macro-blocks surrounding the macro-block of the B-picture.