| CPC H04N 19/577 (2014.11) [H04N 19/109 (2014.11); H04N 19/176 (2014.11); H04N 19/503 (2014.11); H04N 19/513 (2014.11); H04N 19/52 (2014.11); H04N 19/593 (2014.11); H04N 19/107 (2014.11); H04N 19/119 (2014.11); H04N 19/61 (2014.11); H04N 19/82 (2014.11)] | 5 Claims |
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1. A method for decoding a video signal with an image decoding apparatus, comprising:
determining a prediction mode of a current block as an inter prediction mode;
deriving a spatial motion vector of the current block by using a spatial neighboring block of the current block;
determining a collocated picture of the current block based on collocated picture information, wherein the collocated picture information is information specifying a picture determined as the collocated picture of the current block among reference pictures in a reference picture list;
deriving a temporal motion vector based on a motion vector of a collocated block corresponding to the current block in the collocated picture, wherein, the collocated block is determined based on either a first block including a position of the bottom-right pixel of the current block or a second block including a position of the center pixel of the current block and the collocated block is determined by scanning the first block and the second block according to a predetermined scan order;
generating a prediction motion vector candidate list for the current block by using the spatial motion vector and the temporal motion vector;
deriving a motion vector of the current block based on the prediction motion vector candidate list;
obtaining a prediction sample for the current block based on the derived motion vector;
obtaining a residual sample for the current block; and
obtaining a reconstructed sample for the current block by using the prediction sample for the current block and the residual sample, and
wherein the collocated picture information is transmitted from an encoder through a bitstream.
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