Moving picture coding method, moving picture coding apparatus, moving picture decoding method, and moving picture decoding apparatus

A deriving apparatus for deriving a motion vector predictor used to code a motion vector of a current block in an image, the deriving apparatus comprising:

• a first candidate generation unit configured to generate a first candidate for the motion vector predictor, from a first motion vector of each of one or more first adjacent blocks that are adjacent to the current block in a first direction;
• a second candidate generation unit configured to generate a second candidate for the motion vector predictor, from a second motion vector of each of one or more second adjacent blocks that are adjacent to the current block in a second direction, the second direction being different from the first direction;
• and
• a selection unit configured to select the motion vector predictor out of one or more motion vector predictor candidates including at least one of the first candidate and the second candidate,
• wherein the second candidate generation unit includes:
• a determination unit configured to determine for each of the one or more first adjacent blocks whether or not the first adjacent block is inter-predicted;
• and
• a scaling unit configured to scale a scalable second motion vector to generate the second candidate, the scalable second motion vector belonging to one of the one or more second adjacent blocks, only when any of the one or more first adjacent blocks are not inter-predicted.

A deriving apparatus for deriving a motion vector predictor used to code a motion vector of a current block in an image, the deriving apparatus comprising:

• processing circuitry;
• and
• storage coupled to the processing circuitry,
• the processing circuitry being configured to, using the storage:
• generate a first candidate for the motion vector predictor, from a first motion vector of each of one or more first adjacent blocks that are adjacent to the current block in a first direction;
• generate a second candidate for the motion vector predictor, from a second motion vector of each of one or more second adjacent blocks that are adjacent to the current block in a second direction, the second direction being different from the first direction;
• and
• select the motion vector predictor out of one or more motion vector predictor candidates including at least one of the first candidate and the second candidate,
• wherein when generating the second candidate,
• the processing circuitry is configured to determine for each of the one or more first adjacent blocks whether or not the first adjacent block is inter-predicted, and
• scale a scalable second motion vector to generate the second candidate, the scalable second motion vector belonging to one of the one or more second adjacent blocks, only when any of the one or more first adjacent blocks are not inter-predicted.