Abstract: Methods for video decoding and encoding, apparatuses and non-transitory computer-readable storage media thereof are provided. In one method for video decoding, a decoder may obtain a current block that is Intra block copy (IBC) coded based on multi-model IBC, wherein the multi-model IBC adaptively switches among different models. Furthermore, the decoder may obtain one or more linear transformation vectors (LTVs) for the current block.

Abstract: The disclosure generally includes a device and methods for video decoding and encoding. The methods include deriving, a karhunen-loève transform (KLT) matrix from a video sequence, each picture in the video sequence, or each slice in the video sequence, generating an adaptive KLT matrix signal, and signaling the adaptive KLT matrix signal in a sequence parameter set (SPS) header, a picture parameter set (PPS) header, and/or slice header.

Abstract: The present disclosure relates to a bit-width control method of bi-directional optical flow (BDOF) for coding a video signal. The method includes determining a first reference picture I(0) and a second reference picture I(1) associated with a video block, determining first prediction samples I(0)(i,j) of the video block from a reference block in the first reference picture I(0), determining second prediction samples I(1)(i,j) of the video block from a reference block in the second reference picture I(1), controlling internal bit-widths of the BDOF by deriving internal bit-widths of intermediate parameters, determining motion refinements for samples in the video block based on the BDOF being applied to the video block based on the first prediction samples I(0)(i,j) and the second prediction samples I(1)(i,j), and determining bi-prediction samples of the video block based on the motion refinements.

Abstract: An electronic apparatus performs a method of decoding video data. The method includes receiving, from a video bitstream having a hierarchical structure, a first syntax element associated with a first level of the hierarchical structure, in accordance with a determination that the first syntax element indicates that a Cross-Component Sample Adaptive Offset (CCSAO) filter information is present in the first level, reconstructing, from the video bitstream, one or more regions under the first level jointly according to the CCSAO filter information, and in accordance with a determination that the first syntax element indicates that the CCSAO filter information is not present in the first level, reconstructing, from the video bitstream, the one or more regions separately according to the CCSAO filter information present in a second level of the hierarchical structure.

Abstract: This disclosure is related to video coding and compression. More specifically, this disclosure relates to methods and apparatus for improving the coding efficiency of adaptive loop filter (ALF). In one example, the method includes obtaining, by a decoder, one or more spatial neighboring samples associated with a current sample, wherein the one or more spatial neighboring samples are from at least one of: (i) a prediction sample, (ii) a residual sample, or (iii) a reconstructed sample, wherein the reconstructed sample is sampled prior to a sample adaptive offset (SAO) filtering, and obtaining, by the decoder, a filtered sample, based on the one or more spatial neighboring samples associated with the current sample.

Abstract: Methods and apparatuses are provided for video coding. The method includes: partitioning video pictures into a plurality of CUs, at least one of which is further partitioned into two PUs including at least one geometric shaped PU; constructing a first merge list including a plurality of candidates, each candidate being a MV including a List 0 MV, and/or a List 1 MV; locating a first candidate for the first PU and a second candidate for the second PU according to a first index and a second index, respectively; obtaining a first uni-prediction MV for the first PU by selecting a List X1 MV of the first candidate according to a first binary reference list indication flag; and obtaining a second uni-prediction MV for the second PU by selecting a List X2 MV of the second candidate according to a second binary reference list indication flag.

Abstract: Methods for video decoding and encoding, apparatuses and non-transitory computer-readable storage media thereof are provided. In one method for video decoding, a decoder may obtain a plurality of prediction blocks based on a current inter coding block; obtain a current template of the current inter coding block, wherein the current template comprises a plurality of reconstructed samples neighboring to the current inter coding block; obtain a plurality of template predictions of the current template respectively corresponding to the plurality of prediction blocks of the current inter coding block; obtain at least one filter based on the plurality of template predictions and the current template; and obtain a filtered block based on the at least one filter and the plurality of prediction blocks.

Abstract: The disclosure herein provides for methods, apparatuses and non-transitory computer-readable storage media for video decoding and encoding. In example, a method for video decoding, including: obtaining, by a decoder, enabling flags at a first level for at least one mode of intra and inter coding modes, the enabling flags indicating whether Fractional Discrete Cosine Transform (FRDCT) is enabled for the at least one mode; and in response to the FRDCT being enabled at the first level, obtaining, by the decoder, a second flag at a coding unit (CU) level to indicate whether a FRDCT transform is applied to a CU.

Abstract: Methods for video decoding and encoding, apparatuses and non-transitory computer-readable storage media thereof are provided. In one method for video decoding, a decoder may obtain a plurality of first motion compensated samples of a first channel and a plurality of second motion compensated samples of a second channel for a current inter coding block, obtain a non-linear filter, and obtain a plurality of filtered motion compensated samples of the first channel based on the non-linear filter, the first motion compensated samples of the first channel, and the second motion compensated samples of the second channel.

Abstract: The present disclosure provides a method for decoding video data, comprising: obtaining a video block from a bitstream; obtaining internal luma sample values of the video block, external luma sample values of an external region of the video block and external chroma sample values of the external region; selecting, based on the external luma sample values and the external chroma sample values, one filter shape candidate from a plurality of filter shape candidates for predicting internal chroma sample values of the video block, wherein the plurality of filter shape candidates correspond to different sets of weighting coefficients for predicting chroma sample values based on corresponding luma sample values; predicting, with the selected filter shape candidate, the internal chroma sample values based on the internal luma sample values; and obtaining decoded video block using the predicted internal chroma sample values.

Abstract: An electronic apparatus performs a method of decoding video data. The method comprises: receiving, from bitstream, video data corresponding to a transform-skip mode coded block; decoding, from the video data, a first codeword, a second codeword and a first group of codewords for a pixel within the transform-skip mode coded block; deriving an initial level value from the first group of codewords; converting the first codeword into a remainder of the pixel in accordance with a predefined mapping relationship that is generated using a constant Rice parameter; converting the second codeword into a sign value of the remainder; and deriving a quantified residual of the pixel from the remainder, the sign value and the initial level value.

Abstract: A computing device performs a method of decoding video data by receiving, from a bitstream, a first syntax element associated with an SBT coding unit that indicates that there exists at least one non-zero transform coefficient in the SBT coding unit; determining a first transform unit that includes non-zero transform coefficients; receiving a second syntax element associated with a first chroma component of the first transform unit, a third syntax element associated with a second chroma component, and a fourth syntax element associated with luma component of the first transform unit; decoding the transform coefficients of chroma and luma components of the first transform unit, based on the second, third and fourth syntax elements; and setting transform coefficients of luma and chroma components of rest of the plurality of transform units to zeros.

Abstract: A method, a computing device, and a computer readable storage medium are provided for video coding. The method may include deriving parameter ? and parameter ? for a CCLM mode by using a predetermined number of neighboring reconstructed luma samples and chroma samples in a CU; and generating a final chroma predictor for the chroma samples of the CU by using the parameter ? and the parameter ?.

Abstract: An electronic apparatus performs a method of decoding video data. The method comprises: receiving, from the video signal, a picture frame that includes a first component and a second component; receiving, from the video signal, a first syntax element that indicates whether Cross-component Sample Adaptive Offset (CCSAO) is enabled for the second component at a picture level; when the first syntax element indicates the CCSAO is enabled for the second component at the picture level, receiving, from the video signal, a second syntax element that indicates whether the CCSAO is controlled for the second component at a coding tree block (CTB) level; and when the second syntax element indicates the CCSAO is controlled for the second component at the CTB level, receiving, from the video signal, a third syntax element that indicates whether the CCSAO is enabled for the second component at the CTB level.

Abstract: Methods and apparatuses are provided for video coding. The method includes: partitioning video pictures into a plurality of CUs, at least one CU is further partitioned into two PUs including at least one geometric shaped PU; constructing a first merge list including a plurality of candidates, each candidate being a MV including a List 0 MV, or a List 1 MV; locating a first candidate for the first PU and a second candidate for the second PU according to a first index and a second index, respectively; obtaining a first uni-prediction MV for the first PU by selecting a List X1 MV of the first candidate according to a first binary reference list indication flag; and obtaining a second uni-prediction MV for the second PU by selecting a List X2 MV of the second candidate according to a second binary reference list indication flag.

Abstract: Embodiments of the disclosure provide systems and methods for performing occlusion detection in frame rate up-conversion of video data including a sequence of image frames. The method includes determining, by a video processor, whether a target block of a target frame is a potential occlusion block based on at least one of motion vector information or distortion metric information associated with the target block. The target frame is to be generated and interpolated into the sequence of image frames. Responsive to the target block being the potential occlusion block, the method further includes detecting, by the video processor, an occlusion type of the target block. The method additionally includes generating, by the video processor, the target block by performing a motion compensation method adaptively selected based on the occlusion type of the target block.

Abstract: An electronic apparatus performs a method of coding video data. The method includes receiving, from a bitstream of the video data, a first syntax that indicates an affine motion model enabled for a current coding block, estimating parameters of the affine motion model using gradients of motion vectors of multiple spatial neighboring blocks of the current coding block, and constructing motion vectors of the affine motion model for the current coding block by using the estimated parameters. In some embodiments, constructing motion vectors further includes converting the estimated parameters into control point motion vectors (CPMVs), and adding the CPMVs into a current affine merge candidate list. In some embodiments, constructing motion vectors further includes deriving a motion vector predictor for an affine mode.

Abstract: An electronic apparatus performs a method of video coding. The method comprises: obtaining a video picture that includes a first component and a second component; determining a plurality of offsets associated with the second component; utilizing a sample value of the first component to obtain a class index associated with the second component; selecting an offset from the plurality of offsets for the second component according to the class index; and obtaining a sample value of the second component based on the selected offset, wherein the sample value of the first component is derived from one or more of collocated or neighboring samples of the first component relative to a sample of the second component, and wherein the sample value of the first component is derived differently for different chroma formats.

Abstract: A method of constraining the operations of certain inter-mode coding tools in the derivation of motion vector candidates for inter-mode coded blocks employed in video coding standards, such as the now-current Versatile Video Coding (VVC), is performed at a computing device. The computing device determines whether one or more of the reference pictures associated with an inter-mode coded block involved in an operation of an inter-mode coding tool are long-term reference pictures, and constrains the operation of the inter-mode coding tool on the inter-mode coded block based on the determination.

Abstract: Methods for video decoding and encoding, apparatuses and non-transitory computer-readable storage media thereof are provided. In one method for video decoding, a decoder may obtain a motion compensated chroma sample and a plurality of motion compensated luma samples for a current inter coding block. Furthermore, the decoder may obtain an adaptive cross-component filter and obtain a filtered motion compensated chroma sample based on the adaptive cross-component filter, the motion compensated chroma sample, and the plurality of motion compensated luma samples.