Motion vector derivation method, dynamic image encoding method, and dynamic image decoding method

摘要

A motion vector derivation unit (11) includes a comparison unit (20) for comparing a parameter TR1 for a reference vector with a predetermined value to determine whether it exceeds the predetermined value or not; a switching unit (21) for switching selection between the maximum value of a pre-stored parameter TR and the parameter TR1 according to the comparison result by the comparison unit (20); a multiplier parameter table (for multipliers) (22); and a multiplier parameter table (for divisors) (24) for associating the parameter TR1 with a value approximate to the inverse value (1/TR1) of this parameter TR1.