Patent ID: 8233542

Claim:
A method of decoding an encoded moving picture signal comprising: dividing the encoded moving picture signal into plural decoding blocks; calculating a predictive motion vector (PMV) for every decoding block from a decoded motion vector of an adjacent block; decoding pel accuracy information (mv shift) of a differential motion vector (MVD) of each of the plural decoding blocks, said information indicating a type of pel accuracy previously selected among a plurality of types of pel accuracy for the differential motion vector; decoding the differential motion vector (MVD) of each of the decoding blocks which was calculated with the type of pel accuracy indicated by the decoded pel accuracy information (mv_shift) of the respective decoding block; representing a component of the decoded differential motion vector with a type of pel accuracy of the predictive motion vector (PMV) of the respective decoding block; and calculating a motion information (MV) of the respective decoding block, thereby decoding the encoded moving picture signal and reconstructing the moving picture, using an expression selected from: MV=(MVD<<mv shift)+PMV, MV=(MVD<<mv shift)+((PMV>>mv shift)<<mv shift), and MV=(MVD+(PMV>>mv shift))<<mv shift.