Abstract: A video encoding method and a video decoding method are provided for adaptively determining a chroma intra-directional prediction mode. When a DM mode is applied for intra prediction of a chroma signal, the video encoding method and the video decoding method adaptively modify the directional mode of a luma block to conform to the characteristics of a chroma block by considering the position and size of the chroma block, the presence of reference samples, and the size of the luma block. The video encoding method and the video decoding method use the modified directional mode for intra prediction of the chroma signal.

Abstract: The present specification discloses a method of decoding an image. The method of decoding an image according to the method includes: obtaining transform skip information of a current block from a bitstream; obtaining multiple transform selection information of the current block on the basis of the transform skip information from the bitstream; and performing inverse transform on the current block on the basis of the multiple transform selection information, wherein the multiple transform selection information is used to set each of a horizontal transform type and a vertical transform type.

Abstract: Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. Coding decision information of a representative channel of a target block is shared as coding decision information of a target channel of the target block, and decoding of the target block is performed using the coding decision information of the target channel. Since the coding decision information of the representative channel is shared with an additional channel, repeated signaling of identical coding decision information may be prevented. By means of this prevention, the efficiency of encoding and decoding of the target block or the like may be improved.

Abstract: A method and an apparatus for video coding using a video-characteristic-based context model are disclosed. The video coding method and the video coding apparatus determine a context model optimized for an individual video on the basis of information in which various characteristics of the individual video are reflected in entropy encoding and decoding using context adaptive binary arithmetic coding (CABAC).

Abstract: A video decoding method is disclosed for decoding a current block by using intra-prediction. The method includes: decoding related information including an intra-prediction mode of the current block from a bitstream; depending on the presence or absence of a reference sample at a position to be referenced in a first prediction direction indicated by an intra-prediction mode, determining a direction for the intra-prediction in consideration of a second prediction direction different than the first prediction direction; generating a prediction block of the current block by performing the intra-prediction according to the direction for the intra-prediction; reconstructing a residual block of the current block from the bitstream; and reconstructing the current block by adding the prediction block and the residual block.

Abstract: A video coding method and an apparatus using an adaptive order of intra sub-partitions are provided. The video coding method and apparatus adaptively determine an encoding/decoding order of subblocks based on at least one of a shape of the subblock, a size of the subblock, a sub-splitting direction, and a prediction mode in performing intra prediction of the subblocks split from a current block using an ISP mode.

Abstract: A method and an apparatus for video coding using intra sub-block prediction of a chroma block are disclosed. The video coding method and the apparatus adaptively apply a sub-block split method, transmission information, and a transform method in performing intra prediction on chroma signals of a current block using an intra sub-partitions (ISP) mode.

Abstract: An image decoding method for decoding a current block by using intra prediction includes: decoding information related to a chroma intra prediction mode of the current block from a bitstream; determining the chroma intra prediction mode by using a basic intra prediction mode set and an alternative mode according to a first luminance intra prediction mode corresponding to the current block and the related information; generating a prediction block of the current block by using the chroma intra prediction mode; reconstructing a residual block of the current block from the bitstream; and reconstructing the current block by adding the prediction block and the residual block. The alternative mode is adaptively determined.

Abstract: The present specification discloses a method of decoding an image. The method of decoding an image according to the method includes: obtaining transform skip information of a current block from a bitstream; obtaining multiple transform selection information of the current block on the basis of the transform skip information from the bitstream; and performing inverse transform on the current block on the basis of the multiple transform selection information, wherein the multiple transform selection information is used to set each of a horizontal transform type and a vertical transform type.

Abstract: A video encoding/decoding method and an apparatus using intra prediction per subblock basis are provided. The video encoding/decoding method and apparatus modify the intra prediction mode of a current block in a direction suitable for a subpartitioned block by considering the shape of the subpartitioned block, the direction of subpartitioning, and the prediction direction of the current block. Based on the modified intra prediction mode of the current block, the video encoding/decoding method and apparatus generate an intra prediction mode of the subpartitioned block to perform intra prediction per subblock basis effectively.

Abstract: The present disclosure is related to a video encoding/decoding method and an apparatus using selective transmission of subblock partitioning information. The video encoding/decoding method and apparatus selectively encode and decode the splitting direction of a subblock to reduce the overhead of signal transmission for using subblock partitioning while effectively performing intra prediction per subblock basis.

Abstract: An image encoding/decoding method and apparatus for performing encoding/decoding using BDPCM and a storage medium storing a bitstream are provided. An image decoding method performed by an image decoding apparatus may comprise obtaining first information indicating whether block-based differential pulse coded modulation (BDPCM) is applicable to a current image, obtaining second information indicating whether to apply the BDPCM to a current block in the current image based on the first information, obtaining third information indicating a prediction direction of the BDPCM based on the second information, and applying the BDPCM to the current block based on the prediction direction of the BDPCM. The first information may indicate whether BDPCM is enabled for both a luma component and a chroma component of the current block.

Abstract: The present specification discloses a method of decoding an image. The method of decoding an image according to the method includes: obtaining transform skip information of a current block from a bitstream; obtaining multiple transform selection information of the current block on the basis of the transform skip information from the bitstream; and performing inverse transform on the current block on the basis of the multiple transform selection information, wherein the multiple transform selection information is used to set each of a horizontal transform type and a vertical transform type.

Abstract: Disclosed herein is a video decoding method. The video decoding method includes: obtaining a chroma residual joint flag of a current block indicating whether or not a chroma residual joint mode is applied to the current block; obtaining, from a bitstream, a transform skip mode flag for a luma component of the current block and a transform skip mode flag for a first chroma component; when the chroma residual joint flag indicates that a chroma residual joint mode is applied to the current block, determining whether or not a transform skip mode is applied to a second chroma component of the current block, according to the transform skip mode flag for the first chroma component; and, when the chroma residual joint flag indicates that a chroma residual joint mode is not applied to the current block, obtaining, from the bitstream, a transform skip mode flag for the second chroma component of the current block.

Abstract: The present specification discloses a method of decoding an image. The method of decoding an image according to the method includes: obtaining transform skip information of a current block from a bitstream; obtaining multiple transform selection information of the current block on the basis of the transform skip information from the bitstream; and performing inverse transform on the current block on the basis of the multiple transform selection information, wherein the multiple transform selection information is used to set each of a horizontal transform type and a vertical transform type.

Abstract: Disclosed herein is an image encoding/decoding method and apparatus. The image decoding method includes obtaining subblock based transform (SBT) use information, obtaining at least one of SBT division information, SBT division direction information or SBT position information, when the SBT use information indicates use of an SBT, and performing the SBT with respect to a current block based on at least one of the SBT division information, the SBT division direction information or the SBT position information. The SBT use information may be obtained when a width of the current block and a height of the current block are less than a maximum transform size.

Abstract: Disclosed herein is an image encoding/decoding method and apparatus. The image decoding method includes deriving an intra prediction value by performing intra prediction with respect to a current block, deriving an inter prediction value by performing inter prediction with respect to the current block, deriving a combined inter intra prediction (CIIP) value by weighting the intra prediction value and the inter prediction value, and generating a reconstructed block of the current block using the CIIP value. The intra prediction is performed in a Planar mode.

Abstract: Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. Coding decision information of a representative channel of a target block is shared as coding decision information of a target channel of the target block, and decoding of the target block is performed using the coding decision information of the target channel. Since the coding decision information of the representative channel is shared with an additional channel, repeated signaling of identical coding decision information may be prevented. By means of this prevention, the efficiency of encoding and decoding of the target block or the like may be improved.

Abstract: Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. Coding decision information of a representative channel of a target block is shared as coding decision information of a target channel of the target block, and decoding of the target block is performed using the coding decision information of the target channel. Since the coding decision information of the representative channel is shared with an additional channel, repeated signaling of identical coding decision information may be prevented. By means of this prevention, the efficiency of encoding and decoding of the target block or the like may be improved.

Abstract: Disclosed herein is a method of decoding an image. The method includes acquiring intra chroma prediction information of a current block from a bitstream, deriving an intra chroma prediction mode of the current block based on the intra chroma prediction information, and performing intra prediction with respect to the current block based on the intra chroma prediction mode. The intra chroma prediction mode may be any one of a linear model (LM)) mode, a derived luma (DM) mode, a Planar mode, a Vertical mode, a Horizontal mode and a DC mode, and a first bit of the intra chroma prediction information may be used to determine whether the intra chroma prediction mode is an LM mode.