Abstract: The present invention relates to an image encoding and decoding technique, and more particularly, to an image encoder and decoder using unidirectional prediction. The image encoder includes a dividing unit to divide a macro block into a plurality of sub-blocks, a unidirectional application determining unit to determine whether an identical prediction mode is applied to each of the plurality of sub-blocks, and a prediction mode determining unit to determine a prediction mode with respect to each of the plurality of sub-blocks based on a determined result of the unidirectional application determining unit.

Abstract: A device for encoding/decoding the image according to the present invention includes an intra prediction module configured to: determine an intra prediction mode of a current block; determine a scanning order of multiple sub blocks in the current block on the basis of the determined intra prediction mode; and perform intra prediction of the current block on the basis of the determined scanning order.

Abstract: Provided are an encoding device using predictive coding in a screen and a method thereof, and a decoding device and a method thereof. The encoding device is capable of generating a prediction block of a current block according to one of methods for generating a plurality of predetermined prediction blocks, and outputting at least one of encoding information and differential blocks as bitstream by entropy encoding according to whether differential blocks are encoded or not.

Abstract: A method for decoding a target block which has been encoded in an intra block copy (IBC) mode. The method comprises: determining a partition type of the target block by decoding at least one of a first syntax element for determining a reference area to refer to in order to partition the target block and a second syntax element related to the partition type of the target block; decoding block vector information regarding one or more sub-blocks, which have been partitioned from the target block according to the partition type, and determining a block vector corresponding to each of the sub-blocks by using the block vector information; and predicting the target block by generating and combining one or more prediction blocks from a current picture in which the target block is located by using the block vector corresponding to each of the sub-blocks.

Abstract: A block splitting structure is disclosed for efficient prediction and transform, and a method and an apparatus are disclosed for video encoding and decoding using the block Splitting structure. In particular, the method and apparatus are capable of splitting a video data block into two regions or blocks including an L-shaped block and a rectangular block and thus efficiently perform prediction on each block.

Abstract: A method and an apparatus for video coding using segmentation are disclosed. The video coding method and the apparatus segment a current picture to generate objects. The method and apparatus also manage information related to a memory, a filter, and a quantization parameter for each of the objects to enhance encoding efficiency in encoding or decoding of the objects existing in the current picture.

Abstract: The encoding/decoding method and apparatus according to the present invention derives a residual coefficient of a residual block, calculates a quantization parameter for a residual block, performs dequantization on a residual coefficient using a quantization parameter, and performs inverse transform on a dequantized residual coefficient to reconstruct a residual sample of a residual block.

Abstract: A method and for reconstructing chroma blocks and a video decoding apparatus are disclosed. In accordance with one aspect of the present disclosure, provided is a method for reconstructing a chroma block of a target block to be reconstructed. The method includes decoding correlation information between first residual samples and second residual samples, the first residual sample, and prediction information of the chroma block from a bitstream, wherein the first residual samples are residual samples of a first chroma component and the second residual samples are residual samples of a second chroma component. The method further includes generating predicted samples of the first chroma component and predicted samples of the second chroma information on the basis of the prediction information, and deriving the second residual samples by applying the correlation information to the first residual samples.

Abstract: A method and an apparatus for video coding based on mapping are disclosed. The video coding method and the apparatus generate a prediction block of a current block with reference to a mapped image when a video encoding apparatus transmits mapping data related to a mapping of the image and a video decoding apparatus decodes the current block based on the mapping data.

Abstract: A video coding method and an apparatus using a deblocking filtering based on segmentation information are disclosed. The video coding method and the apparatus perform deblocking filtering using segmentation information of an image to avoid performing filtering at the boundary of an object within the image.

Abstract: A method and an apparatus for video coding using derivation of intra prediction modes are disclosed. The video coding method and the video coding apparatus derive the intra prediction mode of a current block using pre-restored, neighboring reference sample values and generate a prediction block of the current block based on the derived prediction mode.

Abstract: The present invention relates to an apparatus and method for encoding and decoding an image by skip encoding. The image-encoding method by skip encoding, which performs intra-prediction, comprises: performing a filtering operation on the signal which is reconstructed prior to an encoding object signal in an encoding object image; using the filtered reconstructed signal to generate a prediction signal for the encoding object signal; setting the generated prediction signal as a reconstruction signal for the encoding object signal; and not encoding the residual signal which can be generated on the basis of the difference between the encoding object signal and the prediction signal, thereby performing skip encoding on the encoding object signal.

Abstract: A video decoding method is disclosed. The method includes: determining a partitioning structure of the target block; reconstructing motion vectors, which correspond to a plurality of partitions split from the target block by the partitioning structure of the target block; using the motion vectors to generate prediction blocks that respectively correspond to the partitions and are equal in size to the target block; generating a prediction block of the target block by weighted averaging the prediction blocks corresponding to the partitions; and reconstructing the target block based on the prediction block of the target block.

Abstract: An encoding/decoding device according to the present invention derives a residual coefficient of a residual block from a bitstream, calculates a quantization parameter for the residual block, performs inverse quantization on the residual coefficient by using the quantization parameter, and performs inverse conversion on the inversely quantized residual coefficient, thereby enabling restoration of a residual sample of the residual block.

Abstract: The present invention relates to a method and an apparatus for interlayer prediction, and the method for interlayer prediction, according to the present invention, comprises the steps of: deciding whether to apply an interlayer prediction to an enhancement layer; and performing a prediction on a current block of the enhancement layer based on reference information that is generalized and generated from a reference picture, which is decoded, of a reference layer, when the interlayer prediction is applied, wherein the reference layer information can be encoding information of a reference block, which corresponds to a current block of the enhancement layer, from the reference layer, and residual information.

Abstract: A video coding method and a device using subblock partition-based intra prediction are disclosed. The video coding method and device perform intra prediction of the subblocks by eliminating unnecessary parsing of the intra-prediction mode or revising the prediction mode or reconstruction order when intra-predicting subblocks divided from the current block.

Abstract: A method of generating a prediction block and a device using same use a weighted-sum of an intra-prediction signal and an inter-prediction signal. The method includes: determining that a current block of the video data is to be encoded in a weighted-sum prediction mode; splitting the current block into two or more subblocks; determining, for each of the subblocks, a weight set including a first weight for an intra-prediction signal of the current block and a second weight for an inter-prediction signal of the current block, the subblocks having different weight sets; and determining a prediction block of the current block based on a weighted-sum of the intra-prediction signal and the inter-prediction signal, the weighted-sum being dependent on the weight set that is determined for each of the subblocks.

Abstract: A method and apparatus for processing a video signal according to the present invention derives a first prediction value of a chrominance block using a sample of a luminance block, calculates a compensation parameter based on a predetermined reference area, derives a second prediction value of a chrominance block, and reconstructs a chrominance block based on a second prediction value of a chrominance block.

Abstract: The encoding/decoding method and apparatus according to the present invention derives a residual coefficient of a residual block, calculates a quantization parameter for a residual block, performs dequantization on a residual coefficient using a quantization parameter, and performs inverse transform on a dequantized residual coefficient to reconstruct a residual sample of a residual block.

Abstract: A device for encoding/decoding the image according to the present invention includes an intra prediction module configured to: determine an intra prediction mode of a current block; determine a scanning order of multiple sub blocks in the current block on the basis of the determined intra prediction mode; and perform intra prediction of the current block on the basis of the determined scanning order.