Patent ID: 9615107
Date: 2017-04-04
CPC Classifications: H04N

Claim:
1. An image decoding method for decoding a current block included in a bitstream, the image decoding method comprising: deriving a first candidate having a first motion vector that has been used to decode a first block; deriving a second candidate having a second motion vector and a first reference picture index value that identifies a first reference picture corresponding to the second motion vector, the second motion vector being a first zero vector; deriving a third candidate having a third motion vector and a second reference picture index value that identifies a second reference picture corresponding to the third motion vector, the third motion vector being a second zero vector, the first reference picture index value being different from the second reference picture index value; deriving, from the bitstream, an index identifying one candidate from a plurality of candidates, the plurality of candidates including the first candidate, the second candidate, and the third candidate; and selecting the candidate, based on the derived index, the candidate being used for decoding the current block, wherein the selected candidate includes a motion vector and a reference picture index value.