Patent ID: 8582651

Claim:
A method of decoding a current image block, the method performed by a moving picture coding system and comprising: obtaining, by the moving picture coding system, reference picture information: determining, by the moving picture coding system, a plurality of reference pictures of the current image block from a plurality of pictures stored in a reference buffer based on the reference picture information, wherein one picture of the plurality of reference pictures has a co-located image block with respect to the current image block, the reference picture information indicating including a reference picture type of another picture of the plurality of reference pictures, the reference picture type being one of long term and short term, the reference picture type characterizing a temporal distance of the reference picture with respect to the current image block; obtaining, by the moving picture coding system, at least one motion vector of the current image block according to the reference picture type, the obtaining step including, obtaining a motion vector of the co-located image block, and generating the motion vector of the current image block based on the motion vector of the co-located image block and the reference picture type; and decoding, by the moving picture coding system, the current image block by motion-compensating the current image block using the motion vector of current image block.