Method and apparatus for simplified motion vector predictor derivation

An apparatus of deriving a motion vector predictor (MVP) candidate set for motion vector coding of a block, the apparatus comprising a circuit integrated into a video chip, the circuit to perform:

• determining a top spatial MVP candidate according to a first available motion vector of top-side neighboring blocks of a current block;
• determining a left spatial MVP candidate according to a first available motion vector of left-side neighboring blocks of the current block;
• performing at most one redundancy checking on a spatial MVP candidate set to determine a redundancy-removed spatial MVP candidate set by removing a redundant MVP candidate from the spatial MVP candidate set if the redundant MVP candidate exists, and the redundancy-removed spatial MVP candidate set is same as the spatial MVP candidate set otherwise, wherein the spatial MVP candidate set includes at most the top spatial MVP candidate and the left spatial MVP candidate, and the redundancy-removed spatial MVP candidate set includes at most the top spatial MVP candidate and the left spatial MVP candidate;
• determining a redundancy-removed spatial-temporal MVP candidate set, wherein the redundancy-removed spatial-temporal MVP candidate set includes the redundancy-removed MVP candidate set and a temporal MVP candidate;
• checking whether a number of MVP candidates in the redundancy-removed spatial-temporal MVP candidate set is smaller than a threshold;
• adding a zero motion vector to the redundancy-removed spatial-temporal MVP candidate set if the number is smaller than the threshold;
• and
• providing the redundancy-removed spatial-temporal MVP candidate set for encoding or decoding of the motion vector of the current block.