Patent ID: 9191679
Filing Date: 2015-11-17
Classification: H04N

Abstract:
1. An encoding method of encoding each block among blocks of pictures, the encoding method comprising: deriving a candidate for a motion vector predictor to be used in encoding of a motion vector for a current block to be encoded, from a first motion vector of a first block included in a first picture, the first picture being different from a picture that includes the current block; adding the derived candidate to a list of candidates; selecting one motion vector predictor from the list of candidates; and encoding the current block using a motion vector of the current block and a reference picture of the current block, and encoding the motion vector using the selected motion vector predictor, wherein the reference picture of the current block is different from the first picture, and wherein the deriving includes: determining whether the reference picture of the current block is a long-term reference picture or a short-term reference picture, and whether a first reference picture of the first block is a long-term reference picture or a short-term reference picture; deriving the candidate from the first motion vector without scaling based on a temporal distance in the case of determining that each of the reference picture of the current block and the first reference picture of the first block is a long-term reference picture; and deriving the candidate from the first motion vector by scaling based on a temporal distance in the case of determining that each of the reference picture of the current block and the first reference picture of the first block is a short-term reference picture.