Method and apparatus for video encoding for adaptive illumination compensation, method and apparatus for video decoding for adaptive illumination compensation

An interlayer video decoding method comprising:

• reconstructing a first layer image based on encoding information acquired from a first layer bitstream;
• reconstructing a second layer current block by using interlayer prediction information acquired from a second layer bitstream and a first layer reference block corresponding to the second layer current block that is to be reconstructed in a first layer reconstruction image;
• determining a luminance compensation parameter to be applied to the first layer reference block;
• and
• compensating for luminance of the first layer reference block by using the luminance compensation parameter and reconstructing a second layer image comprising the second layer current block,
• wherein, the determining of the luminance compensation parameter comprises, when the first layer reference block is located outside a boundary of the first layer reconstruction image, replacing a region outside the boundary and peripheral pixels of the region with pixels that are located inside the boundary of the first layer reconstruction image, and
• wherein the determining of the luminance compensation parameter further comprises determining the luminance compensation parameter based on any one of a color component of the second layer current block, information about a type of a picture comprising the second layer current block, and a prediction mode of the second layer current block.

An interlayer video encoding method comprising:

• generating a first layer bitstream comprising encoding information generated by encoding a first layer image;
• reconstructing a second layer current block by using a first layer reference block corresponding to the second layer current block to be reconstructed in a first layer reconstruction image;
• selecting a luminance compensation model to be applied to the first layer reference block and determining a luminance compensation parameter for the selected luminance compensation model;
• and
• generating a second layer bitstream comprising interlayer prediction information between the first layer reference block and the second layer current block of which luminance is to be compensated for by using the luminance compensation parameter,
• wherein the determining of the luminance compensation parameter comprises determining the luminance compensation parameter based on any one of a color component of the second layer current block, information about a type of a picture comprising the second layer current block, and a prediction mode of the second layer current block.

An interlayer video encoding method comprising:

• reconstructing a first layer image based on encoding information acquired from a first layer bitstream;
• reconstructing a second layer current block by using interlayer prediction information acquired from a second layer bitstream and a first layer reference block corresponding to the second layer current block to be reconstructed in a first layer reconstruction image;
• determining a luminance compensation parameter to be applied to the first layer reference block;
• and
• reconstructing a second layer image comprising the second layer current block by compensating for luminance of the first layer reference block by using the luminance compensation parameter,
• wherein the determining of the luminance compensation parameter comprises, when the first layer reference block is located outside a boundary of the first layer reconstruction image, replacing a region outside the boundary and peripheral pixels of the region with pixels that are located inside the boundary of the first layer reconstruction image, and
• wherein the determining of the luminance compensation parameter further comprises determining the luminance compensation parameter based on any one of a color component of the second layer current block, information about a type of a picture comprising the second layer current block, and a prediction mode of the second layer current block.

An interlayer video decoding apparatus comprising:

• a first layer decoder configured to reconstruct a first layer image based on encoding information acquired from a first layer bitstream;
• a second layer decoder configured to reconstruct a second layer current block by using interlayer prediction information acquired from a second layer bitstream and a first layer reference block corresponding to the second layer current block that is to be reconstructed in a first layer reconstruction image;
• and
• a luminance compensation determiner configured to select a luminance compensation model to be applied to the first layer reference block and determine a luminance compensation parameter for the selected luminance compensation model,
• wherein the luminance compensation determiner is further configured to determine the luminance compensation parameter based on any one of a color component of the second layer current block, information about a type of a picture comprising the second layer current block, and a prediction mode of the second layer current block, and
• the second layer decoder is further configured to compensate for luminance of the first layer reference block by using the luminance compensation parameter and reconstruct a second layer image comprising the second layer current block.

An interlayer video encoding apparatus comprising:

• a first layer encoder configured to generate a first layer bitstream comprising encoding information generated by encoding a first layer image;
• a second layer encoder configured to reconstruct a second layer current block by using a first layer reference block corresponding to the second layer current block to be reconstructed in a first layer reconstruction image;
• and
• a luminance compensation determiner configured to select a luminance compensation model to be applied to the first layer reference block and determine a luminance compensation parameter for the selected luminance compensation model,
• wherein the luminance compensation determiner is further configured to determine the luminance compensation parameter based on any one of a color component of the second layer current block, information about a type of a picture comprising the second layer current block, and a prediction mode of the second layer current block, and
• the second layer encoder is further configured to generate a second layer bitstream comprising interlayer prediction information between the first layer reference block and the second layer current block of which luminance is compensated for by using the luminance compensation parameter.