Method and apparatus for encoding/decoding image signal

A method for encoding a video signal with an encoding apparatus, comprising:

• generating, with the encoding apparatus, a first prediction sample of a current block;
• determining, with the encoding apparatus, a weight prediction parameter set of a current block by 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
• generating, with the encoding apparatus, a second prediction sample of the current block by applying the weight prediction parameter set to the first prediction sample,
• wherein information used to determine the neighboring region is encoded into a bitstream,
• wherein the information specifies a position of the neighboring region and is used to determine the weight prediction parameter set,
• wherein the neighboring region includes a bottom-left neighboring region or a right-top neighboring region, and
• wherein the current block is obtained by dividing an image including the current block based on quad tree division.

A non-transitory computer-readable medium for storing a bitstream generated by an encoding method, the method comprising:

• generating, with the encoding apparatus, a first prediction sample of a current block;
• determining, with the encoding apparatus, a weight prediction parameter set of a current block by 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
• generating, with the encoding apparatus, a second prediction sample of the current block by applying the weight prediction parameter set to the first prediction sample,
• wherein information used to determine the neighboring region is encoded into the bitstream,
• wherein the information specifies a position of the neighboring region and is used to determine the weight prediction parameter set,
• wherein the neighboring region includes a bottom-left neighboring region or a right-top neighboring region, and
• wherein the current block is obtained by dividing an image including the current block based on quad tree division.