54 results about "Coding tree block" patented technology

The present disclosure provides systems and methods for signaling a maximum transform size and a residual coding method. According to certain disclosed embodiments, the methods include: receiving a bitstream comprising a set of pictures, determining, according to the received bitstream, a value of a coded tree block size; and determining, based on the value of the coded tree block size, whether to signal a flag indicating a maximum transform size for luma samples.

A method of decoding includes encountering an end of tile bit with a first value and byte alignment bits in a video bitstream, which indicate that a current coding tree block (CTB) is a last CTB in a tile; encountering an end of CTB row bit with the first value and the byte alignment bits in the video bitstream, which indicate that waveform parallel processing (WPP) is enabled and that the current CTB is the last CTB in a CTB row but not the last CTB in the tile; and reconstructing the plurality of CTBs in the tile based on the end of tile bit with the first value, the end of CTB row bit with the first value, and the byte alignment bits.

An image decoding method performed by an image decoding apparatus, the method includes selecting one of a plurality of reference sample lines neighboring a current block, deriving a reference sample line based on the selected reference sample line, filtering the reference sample line, and deriving prediction samples for the current block based on the filtered reference sample line, wherein the filtering of the reference sample line includes determining whether a filtering is performed based on an intra prediction mode of the current block, a size of the current block, and a position of the selected reference sample line, wherein the reference sample line is selected based on whether a boundary of the current block is a boundary of a coding tree block (CTB), wherein based on the boundary of the current block being the boundary of the CTB, a first upper reference sample line adjacent to the current block is selected, wherein the deriving of the reference sample line includes determining availability for a reference sample, and wherein an unavailable reference sample is replaced based on an available reference sample.

A device (e.g., a decoder) may receive a band-based attenuation indication. The device may obtain attenuation information associated with a coding tree block according to the band-based attenuation indication. The device may apply the attenuation information to a picture, the picture including the coding tree block. In an example, the band-based attenuation indication may be received in a header associated with the coding tree block. The band-based attenuation indication may indicate a band offset parameter associated with the attenuation information. In some examples, the device may receive a plurality of band-based attenuation indications. For example, the first band-based attenuation indication may indicate a band position parameter. The second band-based attenuation indication may indicate a band offset value parameter. In an example, the attenuation information may include a pixel level attenuation map (PWAM). The device may generate a band-based attenuation map (BAM) according to the band-based attenuation indication, and obtain the PWAM based on the BAM.

SUMMARY The present invention provides systems and methods for signaling a maximum transform size and residual coding methods. According to certain disclosed embodiments, the method comprises: receiving a bitstream comprising a set of pictures; determining, from the received bitstream, a value of a coding tree block size; and based on the value of the coding tree block size, determining whether to signal a flag indicating a maximum transform size of luma samples.

The present invention relates to an image encoding / decoding method and device. The image decoding method according to an embodiment of the present invention may comprise the steps of: independently partitioning a luminance coding tree block and a chrominance coding tree block of the current coding tree unit; setting a luminance region corresponding to the current chrominance block partitioned from the chrominance coding tree block; setting a candidate group on the basis of information about at least one block in the luminance region; determining one corresponding luminance block from the candidate group; and generating a prediction block of the current chrominance block on the basis of prediction information about the corresponding luminance block.

Techniques for video processing including video coding, video decoding, and video transcoding are described. One example method includes performing a conversion between a video and a bitstream of the video, the video comprising a video picture comprising one or more slices. The video picture references a picture parameter set, and the picture parameter set conforms to a format rule, the format rule specifying that the picture parameter set comprises a list of column widths for N slice columns, where N is an integer. An (N-1)th slice column is present in the video picture, and a width of the (N-1)th slice column is equal to an (N-1)th entry in the explicitly included list of slice column widths plus a number of coding tree blocks.

The invention provides an encoding device, a decoding device, and a bit stream storage method. The encoding device includes: a circuit; and a memory connected to the circuit, the circuit storing, in a sequence parameter set, presence information indicating whether or not sub-picture information is present during operation, and if the presence information indicates that the sub-picture information is present, (1) sub-picture size information, (2) sub-picture size information, (3) sub-picture size information, (4) sub-picture size information, (5) sub-picture size information, (6) sub-picture size information, and (6) sub-picture size information; the sub-picture size information respectively represents the width and the height of a sub-picture as a rectangular region in the picture by using a coding tree block (CTB); and (2) storing, in the sequence parameter set, sub-picture position information indicating the position of the sub-picture using a CTB which is determined as a square region of a fixed size when neither the right end nor the lower end of the picture, and which is determined as a square region of a fixed size when neither the right end nor the lower end of the picture is located, in the sub-picture position information indicating the position of the sub-picture using a CTB which is determined as a square region of a fixed size when neither the right end nor the lower end of the picture is located. The area is determined to be smaller than the square area of the fixed size.

SUMMARY The present invention provides systems and methods for signaling a maximum transform size and residual coding methods. According to certain disclosed embodiments, the method comprises: receiving a bitstream comprising a set of pictures; determining, from the received bitstream, a value of a coding tree block size; and based on the value of the coding tree block size, determining whether to signal a flag indicating a maximum transform size of luma samples.

A method for controlling an adaptive loop filter comprises obtaining, for a section containing one or more encoding tree blocks, data indicating a number of available alternative chroma filters, obtaining, for an encoding tree block in the section, an alternative filter index that identifies one of the available alternative chroma filters, and selecting the alternative chroma filter identified by the index to filter the chroma image data in the encoding tree block.

A method of controlling an Adaptive Loop Filter comprises obtaining for a slice containing one or more coding tree blocks, data indicating a number of available alternative chroma filters, obtaining for a coding tree block in the slice, an alternative filter index identifying one of the available alternative chroma filters, and selecting the alternative chroma filter identified by the index to filter chroma image data in the coding tree block.

Described is picture segmentation through columns and slices in video encoding and decoding. A video picture is divided into a plurality of columns, each column covering only a part of the video picture in a horizontal dimension. All coded tree blocks (“CTBs”) belonging to a slice may belong to one or more columns. The columns may be used to break the same or different prediction or in-loop filtering mechanisms of the video coding, and the CTB scan order used for encoding and / or decoding may be local to a column. Column widths may be indicated in a parameter set and / or may be adjusted at the slice level. At the decoder, column width may be parsed from the bitstream, and slice decoding may occur in one or more columns.

A method for decoding a video signal and an apparatus therefor are provided. Specifically, a method for decoding a picture can include the steps of, when a current coding tree block is out of a boundary of a current picture, partitioning the current coding tree block into a plurality of coding blocks such that the coding blocks obtained by partitioning the current coding tree block are included in the current picture, when a current coding block satisfies a predetermined condition, parsing a syntax element indicating whether the current coding block is partitioned into a plurality of sub-blocks, and determining a partition mode of the current coding block based on the syntax element.

The invention relates to a compressed sensing-based remote sensing image full-process adaptive coding and decoding method, and relates to the technical field of space remote sensing imaging. The method comprises the following steps of: calculating an image content complexity self-adaptive selection coding mode by utilizing a maximum between-class difference method; extracting an image feature factor, establishing a significance model of a corresponding mode, and guiding the coding tree block to carry out adaptive form partitioning; detecting the sparsity of the coding block through an information density function to mine the sparsity of the image, and realizing the adaptive sampling rate distribution of the image; and adaptively selecting a reconstruction matrix and a sparse base according to the category of the coding block, setting an iteration threshold according to the known sparseness, and reconstructing the coding block by using an orthogonal matching pursuit algorithm. According to the method provided by the invention, the compression ratio does not need to be manually preset, the sampling mode can be selected according to the image content, the compression efficiency is adaptively set by detecting the sparseness, and the requirements of on-satellite rapid compression and ground high-fidelity reconstruction are met.

A method for performing motion compensation includes: receiving a first wrap-around motion compensation flag associated with one or more pictures, and a second wrap-around motion compensation flag associated with a sequence of pictures; and determining whether the first wrap-around motion compensation flag is equal to a first value or a second value based on the second wrap-around motion compensation flag or a luma coding tree block size: when the second wrap-around motion compensation flag is equal to the second value, determining the first wrap-around motion compensation flag equal to the second value, or when the luma coding tree block size in unit of minimum coding block plus 1 is greater than a picture width in unit of minimum coding block minus 1, determining the first wrap-around motion compensation flag is equal to the second value.

Described is picture segmentation through columns and slices in video encoding and decoding. A video picture is divided into a plurality of columns, each column covering only a part of the video picture in a horizontal dimension. All coded tree blocks (“CTBs”) belonging to a slice may belong to one or more columns. The columns may be used to break the same or different prediction or in-loop filtering mechanisms of the video coding, and the CTB scan order used for encoding and / or decoding may be local to a column. Column widths may be indicated in a parameter set and / or may be adjusted at the slice level. At the decoder, column width may be parsed from the bitstream, and slice decoding may occur in one or more columns.

The invention provides an encoding device, a decoding device, and a bit stream storage method. The encoding device includes: a circuit; and a memory connected to the circuit, the circuit storing, during operation, presence information indicating whether or not sub-picture information is present in a sequence parameter set, and if the presence information indicates that the sub-picture information is present, storing sub-picture size information in the sequence parameter set, and if the sub-picture information is present, storing the sub-picture size information in the sequence parameter set. The sub-picture size information indicates the height of a sub-picture, which is a rectangular region within a picture, using a coding tree block (CTB), which is determined as a square region of a fixed size when neither the right end nor the lower end of the picture, and which is determined as a square region of a fixed size when neither the right end nor the lower end of the picture is located, and which is determined as a square region of a fixed size when neither the right end nor the lower end of the picture is located. The area is determined to be smaller than the square area of the fixed size.

For encoding and decoding images, an image encoding device divides each picture into sub-pictures that can be independently displayed, and signals layout information about the sub-pictures, and an image decoding device identifies each sub-block through the layout information and decodes the sub-pictures. A video decoding apparatus and method are configured to decode a bitstream containing an encoded sequence of pictures which are partitioned into a plurality of subpictures including a plurality of coding tree blocks.

A method for decoding a video signal and an apparatus therefor are provided. Specifically, a method for decoding a picture can include the steps of, when a current coding tree block is out of a boundary of a current picture, partitioning the current coding tree block into a plurality of coding blocks such that the coding blocks obtained by partitioning the current coding tree block are included in the current picture, when a current coding block satisfies a predetermined condition, parsing a syntax element indicating whether the current coding block is partitioned into a plurality of sub-blocks, and determining a partition mode of the current coding block based on the syntax element.

Methods and apparatuses for video decoding and video encoding and a method of processing visual media data are included. The apparatus for video decoding includes processing circuitry configured to determine a first region of interest (ROI) in a first reference picture of a current coding tree block (CTB) that is in a current picture. The processing circuitry is configured to determine a subset of allowable partition decisions from a set of partition decisions of the current CTB based at least on first partitioning structures of the first ROI in the first reference picture. The processing circuitry is configured to partition the current CTB based on the subset of allowable partition decisions.

Systems, methods, and instrumentalities can be provided for encoding and / or decoding intra pictures when a chroma CTB belongs to a slice coded in separate tree mode or nodes. A video coding device can determine that a current chroma coding tree block (CTB) is associated with a slice coded in separate tree mode. The video coding device can calculate a full residual luma block collocated with the current chroma CTB. The video coding device can apply the full residual luma block collocated with the current chroma CTB as input to a chroma adaptive loop filter (ALF) or a cross-component adaptive loop filter (CCALF).

The present disclosure provides systems and methods for signaling a maximum transform size, as well as residual encoding methods. In accordance with certain disclosed embodiments, the method comprises: receiving a bitstream comprising a set of images; determining a value of a coding tree block size according to the received bit stream; and determining whether to signal a flag indicating a maximum transform size of a luma sample based on a value of the coding tree block size.

The present disclosure provides systems and methods for signaling a maximum transform size, as well as residual encoding methods. In accordance with certain disclosed embodiments, the method comprises: receiving a bitstream comprising a set of images; determining a value of a coding tree block size according to the received bit stream; and determining whether to signal a flag indicating a maximum transform size of a luma sample based on a value of the coding tree block size.

A method of controlling an Adaptive Loop Filter comprises obtaining for a slice containing one or more coding tree blocks, data indicating a number of available alternative chroma filters, obtaining for a coding tree block in the slice, an alternative filter index identifying one of the available alternative chroma filters, and selecting the alternative chroma filter identified by the index to filter chroma image data in the coding tree block.

A video decoding method for predicting a picture, which is split into equal-sized coding tree blocks, in units of blocks, the method includes: reconstructing a block vector for a current coding block in a current coding tree block to be decoded, by decoding block vector information from a bitstream, wherein the current coding block is one of blocks split from the current coding tree block in a tree structure; and setting, as a prediction block of the current coding block, a reference block indicated by the block vector in the picture in which the current coding block is located.

A method for decoding a video signal and an apparatus therefor are provided. Specifically, a method for decoding a picture can include the steps of, when a current coding tree block is out of a boundary of a current picture, partitioning the current coding tree block into a plurality of coding blocks such that the coding blocks obtained by partitioning the current coding tree block are included in the current picture, when a current coding block satisfies a predetermined condition, parsing a syntax element indicating whether the current coding block is partitioned into a plurality of sub-blocks, and determining a partition mode of the current coding block based on the syntax element.

An electronic device performs a method of decoding video data. The method includes receiving, from a video signal, a picture frame including a first component and a second component, receiving, from the video signal, a first syntax element indicating whether cross-component sample adaptive offset (CCSAO) is enabled for the second component at a picture level, receiving, from the video signal, a second syntax element indicating whether CCSAO is controlled for the second component at a coding tree block (CTB) level when the first syntax element indicates that CCSAO is enabled for the second component at the picture level, and receiving, from the video signal, a third syntax element indicating whether CCSAO is enabled for the second component at the CTB level when the second syntax element indicates that CCSAO is controlled for the second component at the CTB level.

A method is provided that includes: traversing all reconstructed pixels in a coding tree block, calculating a band value of each traversed reconstructed pixel, and calculating a residual value between each traversed reconstructed pixel and a corresponding original pixel; storing the calculated band value of each reconstructed pixel in a first array, and storing the calculated residual value between each reconstructed pixel and the corresponding original pixel in a second array; determining whether m consecutive band values in the first array belong to a same band; and in response to determining that the m consecutive band values in the first array belong to the same band, calculating, based on a residual value in the second array, a cumulative residual value of m reconstructed pixels corresponding to the m consecutive band values, and calculating a cumulative number of the m reconstructed pixels.

A video decoding method for predicting a picture, which is split into equal-sized coding tree blocks, in units of blocks, the method includes: reconstructing a block vector for a current coding block in a current coding tree block to be decoded, by decoding block vector information from a bitstream, wherein the current coding block is one of blocks split from the current coding tree block in a tree structure; and setting, as a prediction block of the current coding block, a reference block indicated by the block vector in the picture in which the current coding block is located.

A method of decoding or encoding an image and a method of transmitting image data are provided. The method of decoding an image includes determining a current transform block by splitting a coding tree block based on a tree-based partitioning, the tree-based partitioning including at least one of a quad-tree partitioning and a binary-tree partitioning; determining whether at least one non-zero residual coefficient is included in the current transform block; and in response to determining that at least one non-zero residual coefficient is included in the current transform block, obtaining residual coefficients of the current transform block according to a scan order of the current transform block, wherein the residual coefficients of the current transform block are obtained based on coefficient level information of the current transform block, wherein the coefficient level information includes at least one of a first residual level flag, a parity flag, and a second residual level flag, wherein the parity flag and the second residual level flag are signaled via a bitstream only when the first residual level flag indicates that an absolute value of the residual coefficient is greater than 1.