2. The method of claim 1 , wherein if the size of the current prediction unit is (3/2)N×2N, the left spatial merge candidate is set as unavailable.
2. The method of claim 1 , wherein if the size of the current prediction unit is (3/2)N×2N, the left spatial merge candidate is set as unavailable. 4. The method of claim 2 , wherein if an above spatial merge candidate has the same motion information of the left spatial merge candidate, the above spatial merge candidate is set as unavailable.