Video signal processing method and device

A video signal decoding device comprising a processor,

• wherein the processor is configured to:
• generate, based on an intra prediction mode for the current block, a first prediction sample of a current sample included in a current block, wherein the intra prediction mode for the current block is indicated through any one of at least one intra prediction mode index included in a specific index set;
• determine at least one reference sample corresponding to the current sample among reference samples of the current block based on the intra prediction mode for the current block;
• obtain at least one reference value corresponding to the current sample based on an unfiltered sample value of the at least one reference sample;
• determine a parameter set based on a width of the current block, a height of the current block, whether an index of the intra prediction mode is smaller than a pre-configured first index, and whether the index of the intra prediction mode is greater than a pre-configured second index;
• generate a second prediction sample by linearly combining a value of the first prediction sample and the at least one reference value based on the determined parameter set, wherein the determined parameter set is used for determining a weight which is used for linearly combining the value of the first prediction sample and the at least one reference value;
• and
• restore the current sample based on a residual signal of the current sample and the second prediction sample.

A video signal encoding apparatus comprising a processor,

• wherein processor is configured to:
• generate, based on an intra prediction mode for a current block, a first prediction sample of a current sample included in the current block, wherein the intra prediction mode for the current block is indicated through any one of at least one intra prediction mode index included in a specific index set;
• determine at least one reference sample corresponding to the current sample among reference samples of the current block based on the intra prediction mode for the current block;
• obtain at least one reference value corresponding to the current sample based on an unfiltered sample value of the at least one reference sample;
• determine a parameter set based on a width of the current block, a height of the current block, whether an index of the intra prediction mode is smaller than a pre-configured first index, and whether the index of the intra prediction mode is greater than a pre-configured second index;
• generate a second prediction sample by linearly combining a value of the first prediction sample and the at least one reference value based on the determined parameter set, wherein the determined parameter set is used for determining a weight which is used for linearly combining the value of the first prediction sample and the at least one reference value;
• and
• restore the current sample based on a residual signal of the current sample and the second prediction sample.

A non-transitory computer-readable medium storing a bitstream, the bitstream being decoded by a decoding method,

• wherein the decoding method, comprising:
• generating, based on an intra prediction mode for a current block, a first prediction sample of a current sample included in the current block, wherein the intra prediction mode for the current block is indicated through any one of at least one intra prediction mode index included in a specific index set;
• determining at least one reference sample corresponding to the current sample among reference samples of the current block based on the intra prediction mode for the current block;
• obtaining at least one reference value corresponding to the current sample based on an unfiltered sample value of the at least one reference sample;
• determine a parameter set based on a width of the current block, a height of the current block, whether an index of the intra prediction mode is smaller than a pre-configured first index, and whether the index of the intra prediction mode is greater than a pre-configured second index;
• generate a second prediction sample by linearly combining a value of the first prediction sample and the at least one reference value based on the determined parameter set, wherein the determined parameter set is used for determining a weight which is used for linearly combining the value of the first prediction sample and the at least one reference value;
• and restoring the current sample based on a residual signal of the current sample and the second prediction sample.