Patent ID: 9083981
Filing Date: 2015-07-14
Classification: H04N

Abstract:
1. A moving picture decoding method of decoding a current block to be decoded which is included in a current picture to be decoded, said moving picture decoding method comprising: determining a display order between the current picture and each of a plurality of reference pictures included in at least one of a first reference picture list and a second reference picture list, the display order being determined using an index of each of the reference pictures; determining whether or not a reference block has two reference motion vectors that refer forward in the display order with respect to the current picture, the reference block being included in one of the reference pictures, the one of the reference pictures being located forward in the display order with respect to the current picture; calculating, when the reference block has the two reference motion vectors that refer forward in the display order with respect to the current picture, (i) a first candidate motion vector of the current block by scaling one of the two reference motion vectors and (ii) a second candidate motion vector of the current block by scaling the other one of the two reference motion vectors; generating a candidate motion vector list in which candidate motion vectors, including the first candidate motion vector and the second candidate motion vector, respectively correspond to values of a candidate motion vector index in one-to-one relationship; decoding index information for identifying a candidate motion vector to be used in decoding; decoding difference information about a difference between a current motion vector of the current block included in the current picture and the candidate motion vector to be used in decoding; calculating the current motion vector by adding the difference information and, from among the candidate motion vectors included in the candidate motion vector list, the candidate motion vector to be used in the decoding, which is identified by the candidate motion vector index having a same value as a value indicated by the index information; and decoding the current block using the current motion vector.