Apparatus for determining motion vectors and a reference picture index for a current block in a picture to be decoded

An apparatus for determining motion vectors of a current block in a current picture, comprising:

• a decoder configured to obtain first and second motion vectors of a block other than the current block, the other block neighboring the current block at one of a left, top and top right position;
• the decoder configured to obtain a direction of the first and second motion vectors of the neighboring block, wherein the direction is obtained based on a comparison of a picture order count value of the current picture and the picture order count value of a reference picture referred by the neighboring block;
• and
• the decoder configured to determine first and second prediction motion vectors of the current block using the first and second motion vectors of the neighboring block such that the first prediction motion vector of the current block has the obtained direction of the first motion vector of the neighboring block and the second prediction motion vector of the current block has the obtained direction of the second motion vector of the neighboring block.