Method and apparatus for motion vector predictor derivation

Abstract

A method for motion vector predictor derivation of a block includes scanning a plurality of candidate motion vector predictors derived from at least a portion of neighbors of the block. The step of scanning the candidate motion vector predictors includes: regarding one of the candidate motion vector predictors, selectively updating a first predictor list according to the candidate motion vector predictor when the candidate motion vector predictor points to a reference block in a designated reference frame of the block, and selectively updating a second predictor list according to the candidate motion vector predictor when the candidate motion vector predictor points to a reference block in a specific reference frame different from the designated reference frame of the block.

What is claimed is: 
     
         1 . A method for motion vector predictor derivation of a block, comprising:
 scanning a plurality of candidate motion vector predictors derived from at least a portion of neighbors of the block;   wherein scanning the candidate motion vector predictors comprises:   regarding one of the candidate motion vector predictors:
 when the candidate motion vector predictor points to a reference block in a designated reference frame of the block, selectively updating a first predictor list according to the candidate motion vector predictor; and 
 when the candidate motion vector predictor points to a reference block in a specific reference frame different from the designated reference frame of the block, selectively updating a second predictor list according to the candidate motion vector predictor. 
   
     
     
         2 . The method of  claim 1 , further comprising:
 determining at least one candidate motion vector predictor in a final predictor list according to the first predictor list and the second predictor list.   
     
     
         3 . The method of  claim 1 , wherein the neighbors comprise a plurality of spatial neighbors of the block and at least one temporal neighbor of the block. 
     
     
         4 . The method of  claim 1 , wherein the motion vector predictor derivation is arranged to find a best motion vector predictor for the block regardless of a size of the block. 
     
     
         5 . The method of  claim 1 , wherein the motion vector predictor derivation is arranged to find a sub-block motion vector predictor for the block with a size smaller than a predetermined block size. 
     
     
         6 . A motion vector predictor derivation apparatus, comprising:
 a storage device, arranged to store at least a first predictor list and a second predictor list; and   a motion vector predictor computing circuit, arranged to scan a plurality of candidate motion vector predictors derived from at least a portion of neighbors of a block;   wherein regarding one of the candidate motion vector predictors scanned, the motion vector predictor computing circuit selectively updates the first predictor list according to the candidate motion vector predictor when the candidate motion vector predictor points to a reference block in a designated reference frame of the block, and selectively updates the second predictor list according to the candidate motion vector predictor when the candidate motion vector predictor points to a reference block in a specific reference frame different from the designated reference frame of the block.