Patent ID: 8644630

Claim:
A decoder for decoding a current block of a picture to be decoded, wherein the decoder obtains at least one motion vector of a block other than the current block, wherein the block other than the current block refers to at least one reference picture pointed to by a reference picture index for a set of the plurality of reference pictures; the decoder obtains 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; the decoder obtains 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; the decoder obtains a difference between the first picture order count value of the picture to be decoded and the second picture order count value of the at least one reference picture; and the decoder predicts a motion vector for the current block by using the at least one motion vector, based on the obtained difference, to decode the current block.