70 results about "Reference block" patented technology

Disclosed is a method for encoding and decoding an image by applying different filtering strength to reference pixels based on a size relationship between a current block and each reference block such that a prediction block for the current block is constructed using reference pixels which are filtered adaptively according to their properties.

The present invention provides a method and apparatus for encoding / decoding an image to enhance inter prediction. According to the present invention, the method includes: determining a first reference picture and a second reference picture of a current block; determining both a first reference block in the first reference picture and a second reference block in the second reference picture; partitioning the current block into a plurality of sub blocks; and obtaining a prediction block of each of the sub blocks on the basis of reference candidate block index information of each of the sub blocks.

A video coding method and apparatus adaptively determine spatial resolution for a horizontal component and a vertical component of a motion vector or block vector indicating a position of a reference block when performing inter prediction or intra block copy (IBC) of a current block. The video coding method and apparatus separately determine each spatial resolution for a plurality of motion vectors.

The disclosure provides a video decoding method and apparatus and a video encoding method and apparatus. A video decoding method is disclosed, by which a first motion vector indicating a first reference block in a first reference picture and a second motion vector indicating a second reference block in a second reference picture are obtained; parameters associated with motion compensation according to a pixel group unit for a current block are obtained based on information of parameters associated with compensation according to a pixel group unit and at least one of parameters associated with a picture including a current picture; for the current block, motion compensation according to a block unit based on the first motion vector and the second motion vector is performed, and motion compensation according to a pixel group unit based on the parameters associated with motion compensation according to a pixel group unit is performed, thereby generating a predicted block and thus restoring the current block. Here, a pixel group can include at least one pixel.

DEPCT6503 / 03 / 2565 Picture coding devices include: unit converters and block options. Vector that transforms the vector block options of the target block in the target image from the information side. The encoding information is stored in memory; the selector selects the blocks. The vector is selected from the vector block selection; and the reference position editor unit is executed. Correction regarding the referenced blocks that are referenced by the selected vector blocks, thus their reference positions. The reference block was modified to refer to the inside of the referenced area, within which the decoded example is located. The target image is searched from image memory that has been decoded according to the block's predicted value. The goal is based on the reference position of the reference block. ----------------------------------------------------------- DEPCT65 Picture coding devices include: unit converters and block options. Vector that transforms the vector block options of the target block in the target image from the information side. The encoding information is stored in memory; the selector selects the blocks. The vector is selected from the vector block selection; and the reference position editor unit is executed. Correction regarding the referenced blocks that are referenced by the selected vector blocks, thus their reference positions. The reference block was modified to refer to the inside of the referenced area, within which the decoded example is located. The target image is searched from image memory that has been decoded according to the block's predicted value. The goal is based on the reference position of the reference block. -----------------------------------------------------------

An encoding method includes: a first reference block of a current block is determined; motion compensation enhancement is performed on the first reference block to obtain at least one second reference block; motion information of the current block is determined according to the at least one second reference block; the current block is encoded according to the motion information; and a first syntax element identification information is setted, wherein the first syntax element identification information is for indicating whether to use a motion compensation enhancement processing mode for the current block; and a value of the first syntax element identification information is encoded, and encoded bits are signalled.

A method for decoding image information, according to the present disclosure, comprises: acquiring image information including prediction information; deriving a prediction mode for a current block on the basis of the prediction information; and deriving prediction samples for the current block on the basis of the prediction mode, wherein the prediction information includes information on a combination of inter prediction and intra prediction, and deriving the prediction samples for the current block comprises: deriving inter prediction samples for the current block on the basis of a reference block; deriving intra prediction samples for the current block on the basis of neighboring samples of the reference block; and deriving prediction samples for the current block on the basis of the inter prediction samples and the intra prediction samples.

The disclosure provides a video decoding method and apparatus and a video encoding method and apparatus. A video decoding method is disclosed, by which a first motion vector indicating a first reference block in a first reference picture and a second motion vector indicating a second reference block in a second reference picture are acquired; parameters associated with motion compensation according to a pixel group unit for a current block are acquired based on information of parameters associated with compensation according to a pixel group unit and at least one of parameters associated with a picture including a current picture; for the current block, motion compensation according to a block unit based on the first motion vector and the second motion vector is performed, and motion compensation according to a pixel group unit based on the parameters associated with motion compensation according to a pixel group unit is performed, thereby generating a predicted block and thus restoring the current block. Here, a pixel group can include at least one pixel.

The present disclosure relates to an improved method and device for encoding and decoding based on intra-block copy (IBC) within the framework of intra-prediction encoding and decoding methods.A method for decoding an encoded video bitstream according to an exemplary embodiment of the present disclosure may include: reading prediction mode information for a prediction decoding of a current block of an image currently being decoded from the bitstream; determining whether the prediction mode information indicates an intra-block copy (IBC) based mode; reading from the bitstream, based on the prediction mode information, at least one prediction vector designating the position of at least one reference block from at least one image comprising the currently decoded image; obtaining at least one reference block based on the prediction vector; generating a prediction block based on the at least one reference block; and performing a prediction decoding for the current block based on the prediction block.

This disclosure generally relates to video coding / decoding, and in particular to enhancing block-adaptive weighted prediction. The method involves receiving a coded video bitstream, which includes the current block of the current frame and a first syntax element indicating the prediction mode of the current block, wherein a plurality of scaling factor lookup tables are stored and include different ranges of scaling factors. In multiple scaling factor lookup tables, the step size or precision of the scaling factor in each lookup table is the same, and A step of determining a prediction mode based on the value of a first syntax element, wherein the prediction mode is used to predict the current block based on the reference block of the reference frame. The steps include determining a scaling factor from one of several scaling factor lookup tables, The process includes the step of reconstructing the current block based on a reference block and a determined scaling factor.

A coding block processing method includes receiving a bit stream, and determining, according to the bit stream, that a current coding block is coded in intra block copy mode, and that the current coding block overlaps a reference coding block. The method further includes, in response to the determination that the current coding block overlaps the reference coding block, determining that the current coding block is a merged block and partitioning the merged block into plural sub-blocks. The method further includes determining motion information of the plural sub-blocks based on one set of motion information indicated in the bit stream, such that the plural subblocks have the same motion information.

An image decoding method may be provided in one embodiment of the present disclosure, the method comprising the steps of: acquiring a geometric partitioning mode index of the current block from a bitstream; sorting a plurality of candidate partitioning modes on the basis of a template cost by using an extension template of the current block extended in a direction parallel to a template of the current block, and extension templates of candidate reference blocks extended in a direction parallel to templates of the candidate reference blocks; determining, as a geometric partitioning mode of the current block, a candidate partitioning mode indicated by the geometric partitioning mode index of the current block from among the plurality of sorted candidate partitioning modes; and obtaining a prediction block of the current block by using the determined geometric partitioning mode of the current block.

Provided are an image decoding method, an image decoding apparatus, an image encoding method, and an image encoding apparatus, the image decoding method including the steps of: acquiring a reference block in a reference image; determining an intra mode for the reference block based on at least one of a plurality of neighboring samples of the reference block and a plurality of internal samples of the reference block; determining a transform kernel for a current block from one or more transform kernels by using the intra mode for the reference block; and performing inverse transform on the current block by using the transform kernel.

This disclosure provides a video decoding method. For example, receiving an encoded video stream. The encoded video stream includes encoded information from multiple images. Based on the encoded information, determining that a current block in the current image is encoded using an inter-frame prediction mode, and generating prediction samples of the current block in the inter-frame prediction mode based at least in part on reference blocks in a reference image different from the current image. Furthermore, obtaining an intra-frame prediction mode associated with the current block in the current image. Determining at least one transform kernel based on the intra-frame prediction mode associated with the current block. Reconstructing the current block based on the at least one transform kernel.

The present embodiment provides a method and device for video coding using intra template matching prediction. In the present embodiment, an image decoding device constructs block vector candidates of a current block on the basis of a template cost indicating a difference between a current template of the current block and a reference template within a predefined reference region. Here, the block vector candidate indicates a reference block corresponding to the reference template, the current template includes pre-reconstructed neighboring pixels of the current block, and the reference template includes neighboring pixels of the reference block. The image decoding device constructs a candidate list for applying a fusion mode, on the basis of the block vector candidates or template costs of the block vector candidates. Here, the candidate list includes new block vector candidates for applying the fusion mode. The image decoding device calculates weights for the new block vector candidates, and predicts the current block on the basis of the weights and the new block vector candidates.

An inter-frame prediction method, an encoding apparatus, a decoding apparatus, and a storage medium. The method comprises: performing an inter-frame prediction operation on the basis of a plurality of reference blocks corresponding to a current block, so as to determine prediction pixel information of the current block; and determining a pixel range of the current block by means of pixel information of the plurality of reference blocks, and adjusting the prediction pixel information of the current block based on the pixel range, so as to obtain adjusted pixel information of the current block. The present disclosure ensures effectiveness of video encoding and decoding.

According to one aspect of the present invention, a decoding method is provided which is performed by a decoder. The method may include the processor analyzing a bitstream to determine an intra-template matching prediction (TMP) mode associated with the current block. The method may include the processor obtaining at least one fractional pixel block vector (BV) for decoding the current block. The method may include the processor obtaining a reference block based on at least one fractional pixel BV. The method may include the processor decoding the current block based on the reference block. The method may include the processor obtaining a transformed fractional pixel BV after decoding the current block based on at least one fractional pixel BV. The method may include the processor storing the transformed fractional pixel BV for decoding another block.

A method and apparatus of image encoding / decoding, a recording medium storing a bitstream, and a transmission method are provided. The image decoding method can include determining at least one reference block for a current block from reference pictures, determining at least one illumination compensation parameter based on a current template for the current block and at least one reference template for the at least one reference block, generating at least one prediction block by modifying samples of the at least one reference block based on the at least one illumination compensation parameter, and generating a final prediction block for the current block based on the at least one prediction block, wherein the at least one reference template has a shape determined from a plurality of template shape candidates.

A video coder determines a template area of the current block having a set of template samples and uses a block vector to locate a reference block. The video coder determines Position-Related Weights (PRWs) for the template samples and derives a Sample-Based Prediction Offset (SPO) for a target prediction sample of the current block from a sum of derived template samples weighted by the respective PRWs. The derived template samples are derived from a reconstructed template and a target template. Each PRW is dependent on a first position of a target template sample with respect to the template area and a second position of the target prediction sample with respect to the current block. The target prediction sample is generated by using the reference block. The video coder applies the SPO to the target prediction sample to generate a refined prediction sample for generating a prediction of the current block.

The application provides a coding and decoding method, a decoder and a decoding chip, and is beneficial to improving the accuracy of a prediction value. The decoding method comprises the following steps: determining a template of a current block, wherein the template of the current block is one of multiple templates; determining a weight function model based on the template of the current block and the templates of two reference blocks; and performing weighted fusion on the two reference blocks by using the weight function model to obtain a prediction block of the current block.

Disclosed is a video signal decoding device for decoding a video signal. The video signal decoding device comprises a processor, wherein the processor: acquires a block vector used for predicting one or more luma blocks corresponding to a chroma block; and predicts the chroma blocks on the basis of the block vector. The block vector indicates a reference block of the current picture including the luma block, the reference block being referenced to when any one of the one or more luma blocks is predicted.

A method and apparatus for video coding are disclosed. According to the method, a current block is partitioned into a first region and a second region along a partition line. For one of the first region and the second region, a target candidate list is derived, the target candidate list including one or more GPM (Geometry Partition Mode) sub-block candidates corresponding to one or more GPM sub-block modes. The one of the first region and the second region is encoded or decoded using the target candidate list including the one or more GPM sub-block candidates. According to another method, an inherited LIC (Local Illumination Compensation) flag is determined by inheriting a reference LIC flag associated with a reference block of the current block.

A method for determining a prediction mode in video coding are provided. A method comprises: determining picture evaluation information of a to-be-encoded current block and a plurality of picture evaluation information of a plurality of encoded reference blocks; calculating, based on the picture evaluation information determined, the correlation between the current block and each of the plurality of reference blocks, respectively, and determining a target reference block in the plurality of reference blocks; performing a prediction search based on a first intra prediction mode of the target reference block, and determining a second intra prediction mode corresponding to the current block. This second intra prediction mode may then be compared with an inter prediction mode to select a final prediction mode for encoding the current block. Based on the final prediction mode, the current block is encoded, and subsequently, the encoded current blocks are stitched to obtain a complete frame.

Systems and methods are described for video coding using generalized bi-prediction. In an exemplary embodiment, to code a current block of a video in a bitstream, a first reference block is selected from a first reference picture and a second reference block is selected from a second reference picture. Each reference block is associated with a weight, where the weight may be an arbitrary weight ranging, e.g., between 0 and 1. The current block is predicted using a weighted sum of the reference blocks. The weights may be selected from among a plurality of candidate weights. Candidate weights may be signaled in the bitstream or may be derived implicitly based on a template. Candidate weights may be pruned to avoid out-of-range or substantially duplicate candidate weights. Generalized bi-prediction may additionally be used in frame rate up conversion.

In a method of video decoding, a coded video bitstream that includes coded information of a current block in a current picture is received. In the method, an initial collocated block position in a collocated picture is determined based on a position of the current block in the current picture. A refined collocated block position of a refined collocated block in the collocated picture is determined based on a search and the initial collocated block position. A reference block in a current reference picture of the current block is determined based on motion information of the refined collocated block. The motion information indicates a collocated reference block in a collocated reference picture of the refined collocated block. In the method, the current block is reconstructed based on the reference block in the current reference picture of the current block.

The application provides a decoding method, an encoding method and device, and corresponding encoder and decoder, and relates to the technical field of coding and decoding. The method comprises the following steps: acquiring a code stream of a to-be-decoded image, wherein the to-be-decoded image comprises a to-be-decoded block; when a reference block corresponding to the to-be-decoded block cannot be acquired, acquiring first data, wherein the first data is obtained by adjusting second data based on parameters of an adjusting operation, the second data is preset reference data, the parameters of the adjusting operation comprise at least one of a first adjusting parameter and a second adjusting parameter, the first adjusting parameter is used for adjusting data precision of the second data, and the second adjusting parameter is used for adjusting a data range of the second data; then, performing intra prediction on the to-be-decoded block based on the first data to obtain prediction data of the to-be-decoded block; and finally, decoding the code stream based on the prediction data to obtain reconstructed data of the to-be-decoded block. The method can reduce the occupied bandwidth of the code stream and improve the coding and decoding performance.