Moving picture coding method and a moving picture decoding method

摘要

A moving picture coding apparatus includes a motion estimation unit ( 101 ) for performing motion estimation by fixing the one of two reference pictures as a reference picture indicated by an inputted default reference picture number DefRefNo and a variable length coding unit ( 107 ) for performing variable length coding on coded residual data ERes, a prediction type PredType, a reference picture number RefNo 2 and motion vectors MV 1, MV 2 on a block-by-block basis, and outputting them as coded moving picture data Str.