Method and apparatus for encoding/decoding image signal
View Patent ↗A method for decoding an image signal according to the present invention may comprise the steps of: determining whether there is a brightness change between a current image including a current block and a reference image of the current image; if it is determined that there is a brightness change between the current image and the reference image, determining weight prediction parameter candidates for the current block; determining a weight prediction parameter for the current block on the basis of index information which specifies any one of the weight prediction parameter candidates; and performing a prediction on the current block on the basis of the weight prediction parameter.
1. A method for decoding a video signal with a decoding apparatus, comprising:
determining, with the decoding apparatus, a weight prediction parameter of a current block using a predetermined reference region, the reference region being a region reconstructed before the current block and including a neighboring region spatially adjacent to the current block; and
predicting, with the decoding apparatus, the current block based on the weight prediction parameter,
wherein the neighboring region is determined based on information which is signaled to specify a position of a region used to determine the weight prediction parameter, and
wherein the neighboring region includes a bottom-left neighboring region or a right-top neighboring region.
2. The method of claim 1 , wherein the weight prediction parameter of the current block is determined based on at least one of a size or a shape of the current block.
3. A method for encoding a video signal with an encoding apparatus, comprising:
determining, with the encoding apparatus, a weight prediction parameter of a current block using a predetermined reference region, the reference region being a region encoded before the current block and including a neighboring region spatially adjacent to the current block; and
predicting, with the encoding apparatus, the current block based on the weight prediction parameter,
wherein information for specifying a position of the neighboring region used to determine the weight prediction parameter is encoded by the encoding apparatus, and
wherein the neighboring region includes a bottom-left neighboring region or a right-top neighboring region.
4. The method of claim 3 , wherein the weight prediction parameter of the current block is determined based on at least one of a size or a shape of the current block.
5. A non-transitory computer-readable medium for storing data associated with a video signal, comprising:
a data stream stored in the non-transitory computer-readable medium, the data stream comprising information specifying a position of a neighboring region which is reconstructed before a current block and is spatially adjacent to the current block,
wherein the neighboring region is used to determine a weight prediction parameter of the current block,
wherein the neighboring region includes a bottom-left neighboring region or a right-top neighboring region,
and
wherein the current block is predicted based on the weight prediction parameter.
6. The non-transitory computer-readable medium of claim 5 , wherein the weight prediction parameter of the current block is determined based on at least one of a size or a shape of the current block.