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

A method of predicting a motion vector for a current block in a current picture by a moving picture decoding device, the method comprising:

• obtaining, by the moving picture decoding device, a direction of a reference picture of the current picture, based on a comparison of a display order of the reference picture and a display order of the current picture;
• obtaining, by the moving picture decoding device, at least three motion vectors for at least three blocks other than the current block based on the direction of the reference picture;
• predicting, by the moving picture decoding device, a forward motion vector for the current block using a median operation of the at least three motion vectors;
• and
• decoding, by the moving picture decoding device, the current block in the current picture using the predicted forward motion vector for the current block.