Abstract:
Provided are a method and device for encoding or decoding a luma block and a chroma block. An image decoding method and device according to an embodiment include an image decoding method including obtaining, from a bitstream, partitioning information for a luma block; partitioning a current luma block in at least one direction, thus partitioning the current luma block into at least two luma blocks, when the partitioning information indicates that the current luma block is to be partitioned to a next level, and obtaining, from the bitstream, merge information about a current chroma block corresponding to the current luma block; performing decoding on the current luma block when the partitioning information indicates that the current luma block is not to be partitioned; partitioning the current chroma block into at least two chroma blocks corresponding to the at least two luma blocks when the partitioning information indicates that the current luma block is to be partitioned to the next level; and performing decoding on the current chroma block when the partitioning information indicates that the current luma block is not to be partitioned or the merge information indicates that the partitioning of the current chroma block is to be discontinued.
Abstract:
Provided are a method and apparatus for encoding or decoding a coding unit on an outline of a picture. An image decoding method and apparatus according to an embodiment determine whether a current coding unit extends across an outline of a picture, by comparing a location of the current coding unit in the picture to at least one of a width and a height of the picture, split the current coding unit in at least one direction into a plurality of coding units based on a shape of the current coding unit upon determining that the current coding unit extends across the outline of the picture, obtain block shape information and split type information of the current coding unit from a bitstream and split the current coding unit into a plurality of coding units based on the block shape information and the split type information upon determining that the current coding unit does not extend across the outline of the picture, and decode a coding unit that is no longer split among the plurality of coding units.
Abstract:
Provided is a video decoding method including obtaining, from a bitstream, information about a prediction mode of a current block; when the prediction mode of the current block is an intra mode, obtaining information about an intra prediction mode of the current block; obtaining a predicted sample value of the current block by using at least one sample that is from among samples included in an adjacent reference region of a plurality of lines and is located, from the current block, in an intra prediction direction indicated by an intra prediction mode. The adjacent reference region of the plurality of lines may include a plurality of lines that are in a vertical direction and located at a left side of the current block, or a plurality of lines that are in a horizontal direction and located at an upper side of the current block.
Abstract:
Provided is a multilayer video decoding method including obtaining partitioning mode information of a current block; obtaining depth-based block partitioning information when the partitioning mode information indicates one of preset partitioning modes; splitting the current block into a plurality of regions when the depth-based block partitioning information indicates that the current block is to be split into the plurality of regions, based on a depth block corresponding to the current block; and performing at least one of motion compensation and inter-layer compensation on the current block, based on the plurality of split regions.
Abstract:
An inter-view video decoding method includes determining a reference value that is a reference for splitting a current block of a depth image corresponding to a texture image, from reference samples at a predetermined location of a reference block included in the texture image; determining a binary map of the current block by comparing the reference value and reference samples of the current block; splitting the current block into a plurality of partitions based on the binary map; and determining prediction values of the plurality of partitions based on adjacent samples of the current block and the binary map.
Abstract:
A screen image encoding method includes: obtaining and storing one or more candidate blocks, which are spatially co-located with a current block, from images encoded prior to a current image; determining whether a reference block used to encode the current block exists in the stored one or more candidate blocks; and encoding at least one of index information indicating the reference block, prediction information used to encode the current block from the reference block, and information about the current block, based on a result of the determining.
Abstract:
Provided are a method and apparatus for inter-layer encoding and a method and apparatus for inter-layer decoding video using residual prediction. The inter-layer video decoding method includes: obtaining a decoded first layer image from a first layer bitstream; determining, based on residual prediction information obtained from a second layer bitstream, whether to perform residual prediction performed on a second layer block by referring to a first layer block corresponding to the second layer block within the first layer image; in response to determining not to perform the residual prediction, obtaining luminance compensation information from the second layer bitstream and determining whether to perform luminance compensation based on the luminance compensation information; and in response to determining to perform the luminance compensation, performing the luminance compensation on the second layer block.
Abstract:
Provided is an inter-layer decoding method including reconstructing a color image and a depth image of a first layer, based on encoding information about the color image and the depth image of the first layer, wherein the encoding information is obtained from a bitstream; determining, from the depth image of the first layer, a depth image block of the first layer which corresponds to a current block of a second layer image to be decoded; determining whether an area included in the determined depth image block of the first layer deviates from a boundary of the depth image of the first layer; when the area included in the depth image block deviates from the boundary, determining a depth value of the area deviating from the boundary of the depth image; determining a disparity vector indicating a corresponding block of the first layer image with respect to the current block, based on the determined depth value of the area deviating from the boundary of the depth image; and reconstructing the current block by using the disparity vector.
Abstract:
Multi-view video encoding and decoding in which a merge candidate list is formed according to a fixed priority for determining whether a view synthesis prediction candidate is to be added as a merge candidate to the merge candidate list for encoding and decoding a current block.
Abstract:
Provided is a video decoding method including determining whether a random access point (RAP) picture is positioned in an enhancement layer; determining whether a random access skipped leading (RASL) picture related to the RAP picture is output; and if the RAP picture is positioned in the enhancement layer and the RASL picture is determined not to be output, activating a SPS corresponding to the RAP picture when the RAP picture that is not at a start point of a CVS is decoded.