Method and apparatus of motion vector prediction with extended motion vector predictor

An apparatus for deriving motion vector predictor or motion vector predictor candidate for encoding or decoding a motion vector of a current PU (prediction unit) in a picture, the apparatus comprising:

• one or more electronic circuits, wherein said one or more circuits are configured to
• receive a current motion vector or a current motion vector difference of the current PU;
• receive motion vectors associated with at least one spatially neighboring block of the current PU and at least one neighboring block of a co-located PU of the current block, wherein said at least one neighboring block of the co-located PU is selected from a group consisting of one or more right-neighboring blocks immediately adjacent to a right side of the co-located PU, one or more below-neighboring blocks immediately below the co-located PU, and one below-right-neighboring block immediately across from lower-right corner from the co-located PU;
• further receiving the motion vector associated with at least one co-located block Ti,j in the co-located PU when no available motion vector in said at least one neighboring block of the co-located PU, wherein the co-located block Ti, j is selected from a co-located block group consisting of {To, o, . . . , Tm, n}, m and n are integers, 0<−i<−m, 0<−j<−n, Ti,j=/To, o, and the motion vector associated with said at least one neighboring block of the co-located PU is replaced by the motion vector associated with said at least one co-located block Ti, j in the co-located PU;
• determine a MVP (motion vector predictor) or a MVP candidate based on a MVP set, wherein the MVP set comprises motion vector candidates derived from the motion vectors associated with said at least one spatially neighboring block of the current PU and said at least one neighboring block of the co-located PU;
• and
• apply predictive encoding or decoding to the current PU based on the MVP or the MVP candidate.

A method of deriving motion vector predictor or motion vector predictor candidate for encoding or decoding a motion vector of a current prediction unit (PU) in a picture, the method comprising:

• receiving a current motion vector or a coded motion vector of the current PU;
• receiving motion vectors associated with at least one spatially neighboring block of the current PU and at least one co-located block Ti,j in a co-located PU of the current PU, wherein the co-located block Ti,j is selected from a co-located block group consisting of {T0,0, . . . , Tm,n}, m and n are integers, 0≦i≦m, and 0≦j≦n;
• determining a motion vector predictor (MVP) or a MVP candidate based on a MVP set, wherein the MVP set comprises motion vector candidates derived from the motion vectors associated with said at least one spatially neighboring block and said at least one co-located block Ti,j, wherein said at least one co-located block Ti,j excludes T0,0;
• and
• applying predictive encoding or decoding to the current PU based on the MVP or the MVP candidate.