HK1082625B - Moving picture coding method - Google Patents

Abstract

A method for calculating direct mode motion vectors of a B (Bi-predictive) picture in a moving picture coding system extracts the direct mode motion vectors of the B picture. When a list 1 reference picture for direct mode temporally precedes or follows the B picture, any one of the motion vectors of a co-located block in the list 1 reference picture is determined as a motion vector for derivation of the direct mode motion vectors regardless of modes (a list 0 mode and/or a list 1 mode) of the motion vectors of the co-located block. The determined motion vector is scaled to derive a list 0 motion vector MVF and a list 1 motion vector MVB. Further, a reference picture pointed by the determined motion vector is determined as a list 0 reference picture for direct mode.