33results about How to "Improve encoding/decoding efficiency" patented technology

Disclosed are an image decoding and encoding method and a method for transmitting a bitstream. An image decoding method performed by an image decoding device according to the present disclosure may comprise the steps of: dividing an image and determining a current block; identifying whether the palette mode is applicable to the current block based on a palette mode flag obtained from the bitstream; acquiring palette mode encoding information on the current block from the bitstream on the basis of the tree type of the current block and whether the palette mode is applicable to the current block; and acquiring chroma component prediction information on the current block from the bitstream when the palette mode is not suitable for the current block.

The present invention relates to an image encoding / decoding method and a recording medium therefor. To this end, a method of decoding an image can include the steps of generating a list of a plurality of motion vector candidates according to an inter prediction direction of a current block, obtaining a plurality of motion vectors for the current block by using the list of the plurality of motion vector candidates, determining a plurality of prediction blocks for the current block by using the plurality of motion vectors, and obtaining a final prediction block for the current block based on the plurality of prediction blocks.

This invention provides a video signal decoding / encoding method and a bitstream transmission method. The video signal decoding method includes the following steps: determining an intra-frame prediction mode for a current block; obtaining reference samples based on neighboring samples of the current block; obtaining a first prediction sample for the current block based on the reference samples and the intra-frame prediction mode; obtaining a second prediction sample for the current block by applying weighted filtering to the reference samples and the first prediction sample; and obtaining a reconstructed sample for the current block based on the second prediction sample.

An image encoding / decoding method, a bit stream transmission method, and a computer-readable recording medium for storing a bit stream are provided. An image decoding method according to the present disclosure relates to an image decoding method performed by an image decoding device, and may comprise the steps of: reconstructing a picture from a bitstream; and transforming the reconstructed picture based on one of the at least one candidate transformation, where the at least one candidate transformation corresponds to a rotational transformation or a symmetric transformation for the picture.

The invention relates to an image encoding / decoding apparatus and an apparatus for transmitting data of an image. An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus according to the present disclosure may comprise the steps of: determining a prediction mode of a current block on the basis of prediction information obtained from a bitstream; obtaining a flag indicating whether to apply a color space transform to a residual sample of the current block based on the prediction mode of the current block; determining a quantization parameter of the current block based on the flag; and determining a transform coefficient of the current block based on the quantization parameter.

The video signal processing method and apparatus according to the present invention can determine the intra-prediction mode of the current block, determine the reference sample for intra-prediction of the current block, determine a predetermined matrix based on the intra-prediction mode, and predict the current block based on the reference sample and the matrix.

According to an embodiment of the present disclosure, a video signal decoding method includes the following steps: dividing a current picture into multiple parallel blocks, decoding partition information indicating a stripe type, wherein the partition information indicates whether a rectangular stripe is applied, decoding width information and height information for a first stripe, decoding parallel block index difference information for the first stripe, and determining an index of an upper left parallel block of a second stripe based on the difference information.

This invention relates to an image encoding / decoding method and a recording medium for the method. To this end, a method for decoding an image may include the following steps: generating a list of multiple motion vector candidates based on the inter-frame prediction direction of a current block; obtaining multiple motion vectors for the current block using the list of multiple motion vector candidates; determining multiple prediction blocks for the current block using the multiple motion vectors; and obtaining a final prediction block for the current block based on the multiple prediction blocks.

The present disclosure relates to a video decoding method, a video encoding method, and a computer-readable recording medium storing a bitstream encoded by the video encoding method, the video decoding method comprising: determining whether a palette mode is applied to a current block; configuring a current palette table based on the palette prediction table in a case where the palette mode is applied to the current block; determining a palette index for each pixel in the current block; and reconstructing the current pixel in the current block based on the current palette table and the palette index for the current pixel, in which, if the current block is included in a first coding tree unit of the current coding tree unit row, the palette prediction table is inherited from an upper adjacent coding tree unit adjacent to the first coding tree unit, the upper adjacent coding tree unit directly adjoins an upper boundary of the current coding tree unit, and wherein the upper adjacent coding tree unit is included in a coding tree unit row processed in parallel with the current coding tree unit row.

An image encoding / decoding method, a bit stream transmission method, and a computer-readable recording medium storing a bit stream are provided. An image decoding method according to the present disclosure comprises the steps of: acquiring a source picture timing information (SPTI) supplemental enhancement information (SEI) message; and reconstructing the image based on the SPTI SEI message, where the SPTI SEI message may include information about source picture timing for a picture associated with the SEI.

The present disclosure relates to a method for encoding / decoding a video signal and an apparatus therefor. The method for decoding a video according to the present disclosure comprises: partitioning a picture into a plurality of parallel blocks; and determining at least one slice based on the plurality of parallel blocks. In this regard, the step of partitioning the picture into a plurality of parallel blocks may include: determining a width of a first parallel block column in the picture; and determining a width of a second parallel block column adjacent to the first parallel block column.

Image encoding / decoding methods and apparatus are provided. The image decoding method performed by the image decoding apparatus according to this disclosure includes the following steps: obtaining a first flag indicating the presence of Network Abstraction Layer (NAL) HRD parameters in the bitstream and a second flag indicating the presence of Video Coding Layer (VCL) HRD parameters in the bitstream; obtaining a third flag indicating whether the time interval between the output times of consecutive frames in the bitstream has a fixed value; deriving the output time of the frames in the bitstream based on at least one of the first, second, and third flags; and processing the frames in the bitstream based on the derived output times, wherein the first flag has a second value indicating that the NAL HRD parameters are not present in the bitstream and the second flag has a second value indicating that the VCL HRD parameters are not present in the bitstream, and the third flag can be restricted to having a first value indicating that the time interval between the output times of consecutive frames in the bitstream has a fixed value.

A video encoding method and apparatus are disclosed. An intra prediction method for video decoding includes determining an intra prediction mode belonging to an initial directional prediction range for an intra prediction of an MxN current block, determining whether to correct the intra prediction mode from the initial directional prediction range to a corrected directional prediction range based on a horizontal length N and a vertical length M of the MxN current block, determining a corrected intra prediction mode belonging to the corrected directional prediction range, and performing the intra prediction of the MxN current block based on the corrected intra prediction mode, the initial directional prediction range including a first prediction range, a second prediction range, and a third prediction range, the corrected directional prediction range including the first prediction range, the second prediction range, and a fourth prediction range according to the vertical length M, the intra prediction being performed by using reference regions adjacent to the current block, the reference regions including an upper reference pixel column and a left reference pixel column of the current block.

The present disclosure relates to an image encoding / decoding method for template matching processing, a method for transmitting a bitstream, and a recording medium having the bitstream stored therein. According to an embodiment of the present disclosure, an image decoding method performed by an image decoding apparatus may comprise the steps of: determining a prediction mode of a current block, generating a prediction block of the current block based on the prediction mode; and reconstructing the current block based on the prediction block, wherein the prediction mode can be determined according to the template matching-based compilation tool activation information.

The present disclosure relates to a video decoding method, a video encoding method, and a computer-readable recording medium storing a bit stream encoded by the video encoding method, the video decoding method comprising: configuring a current palette table based on a palette prediction table; determining a palette index for each pixel in the current block; reconstructing the current pixel in the current block based on the current palette table and the palette index for the current pixel; and updating the palette prediction table with the current palette table, where, if the current block is included in a first coding tree unit of the current coding tree unit row, the palette prediction table is inherited from an upper adjacent coding tree unit adjacent to the first coding tree unit, the upper adjacent coding tree unit directly adjoins an upper boundary of the current coding tree unit, and wherein the upper adjacent coding tree unit is included in a coding tree unit row processed in parallel with the current coding tree unit row.

A method and apparatus for encoding / decoding an image are provided. A method for decoding an image according to the present disclosure can include the steps of obtaining a reconstructed image, determining a target boundary of deblocking filtering in the reconstructed image, determining a boundary strength of the target boundary, and applying deblocking filtering to the target boundary based on the boundary strength, wherein when the target boundary is a transform block boundary and a color component of the reconstructed image is a chroma component, the boundary strength can be determined based on whether joint CbCr residual coding is performed on at least one of two blocks adjacent to the target boundary, and the joint CbCr residual coding can correspond to encoding residual samples of a chroma Cb component and a chroma Cr component as a single transform block.

The invention relates to an image encoding / decoding apparatus and an apparatus for transmitting data of an image. An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus according to the present disclosure may comprise the steps of: determining a prediction mode of a current block on the basis of prediction information obtained from a bitstream; obtaining a flag indicating whether to apply a color space transform to a residual sample of the current block based on the prediction mode of the current block; determining a quantization parameter of the current block based on the flag; and determining a transform coefficient of the current block based on the quantization parameter.

Disclosed are an image decoding and encoding method and a method for transmitting a bitstream. An image decoding method performed by an image decoding device according to the present disclosure may comprise the steps of: dividing an image and determining a current block; identifying whether the palette mode is applicable to the current block based on a palette mode flag obtained from the bitstream; acquiring palette mode encoding information on the current block from the bitstream on the basis of the tree type of the current block and whether the palette mode is applicable to the current block; and acquiring chroma component prediction information on the current block from the bitstream when the palette mode is not suitable for the current block.

A video encoding method and apparatus are disclosed. An intra prediction method for video decoding, comprising: determining an intra prediction mode belonging to an initial directional prediction range for an intra prediction of an MxN current block; determining whether to correct the intra prediction mode from the initial directional prediction range to a corrected directional prediction range based on a horizontal length N and a vertical length M of the MxN current block; determining a corrected intra prediction mode belonging to the corrected directional prediction range; performing the intra prediction of the MxN current block based on the corrected intra prediction mode, the initial directional prediction range comprising a first prediction range, a second prediction range and a third prediction range, the corrected directional prediction range comprising the first prediction range, the second prediction range and a fourth prediction range according to the vertical length M of the MxN current block, the intra prediction of the MxN current block being performed by using a reference region adjacent to the MxN current block.

Provided is an image encoding / decoding method and device. The image decoding method according to the present disclosure may include the following steps: obtaining a partition index of a current block from a bitstream; performing a weighted sum of predicted samples of a first subblock of the current block and predicted samples of a second subblock of the current block based on the partition index to generate predicted samples of the current block, wherein the partition index indicates a partition distance and a partition direction included in a predefined table.

An encoding / decoding method, a bit stream transmission method, and a computer-readable recording medium storing a bit stream are provided. A method according to the present disclosure comprises the steps of: acquiring information on optimization applied to a video from a bitstream; and determining an optimization purpose and method based on the information about the optimization, where the information about the optimization may include first information indicating the optimization purpose and second information indicating a type of the optimization method.

Disclosed are an image decoding and encoding method and a method for transmitting a bitstream. An image decoding method performed by an image decoding device according to the present disclosure may comprise the steps of: dividing an image and determining a current block; identifying whether the palette mode is applicable to the current block based on a palette mode flag obtained from the bitstream; acquiring palette mode encoding information on the current block from the bitstream on the basis of the tree type of the current block and whether the palette mode is applicable to the current block; and acquiring chroma component prediction information on the current block from the bitstream when the palette mode is not suitable for the current block.

An image decoding method according to the present disclosure includes the following steps: parsing parallel block column quantity information indicating a value obtained by subtracting 1 from the number of parallel block columns included in the i-th stripe; parsing parallel block row quantity information indicating a value obtained by subtracting 1 from the number of parallel block rows included in the i-th stripe; and if both the parallel block column quantity information and the parallel block row quantity information are 0, further parsing quantity information related to the number of stripes in which height information in the parallel blocks including the i-th stripe is explicitly sent with a signal.

Disclosed are an image decoding and encoding method and a method for transmitting a bitstream. An image decoding method performed by an image decoding device according to the present disclosure may comprise the steps of: dividing an image and determining a current block; identifying whether the palette mode is applicable to the current block based on a palette mode flag obtained from the bitstream; acquiring palette mode encoding information on the current block from the bitstream on the basis of the tree type of the current block and whether the palette mode is applicable to the current block; and acquiring chroma component prediction information on the current block from the bitstream when the palette mode is not suitable for the current block.

The present disclosure relates to an image encoding / decoding method and apparatus for limiting the size of a chroma block, and a method for transmitting a bitstream. An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus includes determining a division type of a current block, dividing the current block into a plurality of lower layer blocks based on the division type, and decoding the lower layer blocks. In this case, the current block may be a chroma block, and determination of a partition type of the current block may be performed by not allowing a predetermined type in which a width or height of a lower block among a plurality of partition types is a predetermined value.

The present disclosure relates to an image encoding / decoding method and apparatus for limiting the size of a chroma block, and a method for transmitting a bitstream. An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus includes determining a division type of a current block, dividing the current block into a plurality of lower layer blocks based on the division type, and decoding the lower layer blocks. In this case, the current block may be a chroma block, and determination of a partition type of the current block may be performed by not allowing a predetermined type in which a width or height of a lower block among a plurality of partition types is a predetermined value.

The application relates to an image decoding method, an image encoding method, and a bitstream transmission method. An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding device according to the present disclosure comprises the steps of: determining a quantization parameter of a current block on the basis of whether color space conversion is applied to a residual sample of the current block; determining a conversion coefficient of the current block based on the quantization parameter; determining a residual sample of the current block using the conversion coefficient; and resetting the value of the residual sample based on whether the color-space conversion is applied.