Patent ID: 8639048

Claim:
A method for a decoder to predict a motion vector of a current block of a picture to be decoded, comprising: remapping, by the decoder, reference picture indices for a plurality of reference pictures, based on remapping information; obtaining, by the decoder, at least one motion vector of a block other than the current block, referring to at least one reference picture pointed to by a reference picture index for the plurality of reference pictures; obtaining, by the decoder, a first picture order count value of the picture to be decoded, wherein the first picture order count value represents a display order of the picture to be decoded; obtaining, by the decoder, a second picture order count value of the at least one reference picture, wherein the second picture order count value represents a display order of the at least one reference picture; comparing, by the decoder, the first picture order count value of the picture to be decoded with the second picture order count value of the at least one reference picture; and predicting, by the decoder, a block motion vector of the picture to be decoded from the at least one motion vector of the block other than the current block, based on the comparison step.