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...http://www.google.de/patents/US7327788?utm_source=gb-gplus-sharePatent US7327788 - Motion vector derivation method, dynamic image encoding method, and dynamic image decoding method
