| 摘要 |
A method for determining a motion vector is provided to improve a B(Bi-predictive) picture coding efficiency by presenting a direct mode motion vector extraction technique for a B picture defined in an advance moving picture compression technique and increasing the possibility that direct mode will be selected as the prediction mode of a macroblock. In inducing a motion vector for a bi-predictive block on the basis of the list-0 motion vector of a co-located in a reference picture for a bi-predictive block, a control part selects the list-0 motion vector of the co-located block as a motion vector to induce a motion vector for the bi-predictive block, without regard to what the bi-predictive block contains a list-1 motion vector. Based on the temporal distance between the current picture containing the bi-predictive block and the reference picture, the control part performs scaling for the selected list-0 motion vector. Then the control part induces a motion vector for the bi-predictive block, based on the scaled motion vector.
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