Method for inducing a merge candidate block and device using same
The present invention relates to a method for inducing a merge candidate block and a device using same. An image decoding method involves decoding motion estimation region (MER) related information; determining whether or not a predicted target block and a spatial merge candidate block are included in the same MER; and determining the spatial merge candidate block to be an unavailable merge candidate block when the predicted target block and the spatial merge candidate block are included in the same MER. Accordingly, by parallely performing the method for inducing a merge candidate, parallel processing is enabled and the computation amount and implementation complexity are reduced.
1. A method of decoding a video signal, comprising:
determining whether a spatial merge candidate is decoded or not;
determining, based on parallel merge level information, whether the spatial merge candidate is included in a same MER (Motion Estimation Region) as a current prediction block;
when the spatial merge candidate is decoded and is not included in the same MER as the current prediction block, determining that the spatial merge candidate is an available merge candidate for inter prediction of the current prediction block;
deriving motion information from the available merge candidate block, the motion information comprising at least one of motion vector information or reference picture information;
generating a merge candidate list of the current prediction block, the merge candidate list comprising the available merge candidate; and
performing an inter prediction relating to the current block based on the merge candidate list,
wherein the spatial merge candidate block includes at least one of neighboring blocks adjacent to the current prediction block, the neighboring blocks including a left neighboring block, a top neighboring block, a top-right neighboring block, a left-bottom neighboring block or a top-left neighboring block,
wherein when a size of a MER (Motion Estimation Region) is 8×8 and a size of a coding block is 8×8, at least one of the neighboring blocks is replaced to a replacement block located outside the MER, and
wherein when the size of the MER is not 8×8 and the size of the coding block is not 8×8, none of the neighboring blocks is replaced to the replacement block located outside the MER.
2. The method of claim 1 , wherein the size of the MER is indicated by the parallel merge level information which is obtained from the video signal.
3. The method of claim 2 , wherein whether the spatial merge candidate block is included in the same MER as the current prediction block is determined by using position information in addition to the parallel merge level information, the position information including position information of the current prediction block and position information of the spatial merge candidate block.
4. The method of claim 1 , wherein the current prediction block and the replaced neighboring block, whose sizes are 8×4 or 4×8, are included in the coding block.
5. The method of claim 4 , wherein the replacement block is not adjacent to the current prediction block but adjacent to the replaced neighboring block.
6. The method of claim 1 , wherein the replacement block is located on a same vertical or horizontal line as the replaced neighboring block and the replacement block is adjacent to the coding block.