Abstract: A method of encoding a video sequence into a bitstream includes receiving a video sequence; encoding one or more pictures of the video sequence; and generating a bitstream. The encoding includes compressing a reference picture; transforming, based on the reference picture, a plurality of inter pictures associated with the reference picture into facial semantics; and encoding the facial semantics.

Abstract: The present disclosure provides methods and apparatuses for performing image synthesis. An exemplary image synthesis method includes: acquiring a first image and a second image an image quality of the first image being higher than an image quality of the second image; obtaining a compressed image by compressing the first image; and synthesizing at least a part of the compressed image with at least a part of the second image.

Abstract: A video decoding method using a subblock temporal motion prediction for regular inter mode (sbAmvp mode). The method includes: receiving a bitstream comprising one or more syntax elements signaling coding unit (CU) level motion information associated with a CU, wherein the CU is encoded using regular inter mode; dividing the CU into a plurality of subblocks; and performing the sbAmvp mode on the plurality of subblocks.

Abstract: The present disclosure provides a computer-implemented method for encoding or decoding video. The method includes encoding or decoding, in a plurality of picture parameter sets (PPS) associated with pictures of a coded layer video sequence (CLVS), corresponding first PPS flags indicating whether pictures are allowed to be partitioned into a plurality of tiles or slices. In a first PPS, a corresponding first PPS flag with a first value indicates a first picture of the CLVS is unpartitioned, and in a second PPS, another corresponding first PPS flag with a second value being different from the first value indicates that a second picture of the CLVS is allowed to be partitioned.

Abstract: The present disclosure provides a video data processing method for cross-component sample adaptive offset (CCSAO). The method includes determining an index based on a vertical coordinate of a chroma sample within a picture; determining a luma sample based on the index; classifying the chroma sample based on a reconstructed value associated with the luma sample; determining an offset based on the classification; and adding the offset to a reconstructed value associated with the chroma sample.

Abstract: Exemplary embodiments include systems and methods for coding a video comprising a plurality of pictures including a current picture, a first reference picture, and a second reference picture, where each picture includes a plurality of blocks. In one method, for at least a current block in the current picture, a number of available bi-prediction weights is determined based at least in part on a temporal layer and/or a quantization parameter of the current picture. From among available bi-prediction weights a pair of weights are identified. Using the identified weights, the current block is then predicted as a weighted sum of a first reference block in the first reference picture and a second reference block in the second reference picture. Encoding techniques are also described for efficient searching and selection of a pair of bi-prediction weights to use for prediction of a block.

Abstract: A video processing method includes: determining whether an inter predictor correction is enabled for a coding block; and when the inter predictor correction is enabled for the coding block, performing the inter predictor correction by: obtaining a plurality of predicted samples from a top boundary and a left boundary of a predicted block corresponding to the coding block; obtaining a plurality of reconstructed samples from top neighboring reconstructed samples and left neighboring reconstructed samples of the coding block; and deriving a corrected predicted block based on the plurality of the predicted samples, the plurality of the reconstructed samples and the predicted block.

Abstract: A method of decoding a bitstream to get one or more pictures for a video stream includes: receiving a bitstream; and decoding the bitstream to get the one or more pictures. The decoding includes: decoding a picture unit comprising one or more supplemental enhancement information (SEI) messages; and generating the one or more pictures based on a key picture and the one or more SEI messages, respectively.

Abstract: The present disclosure provides systems and methods for wrap-around motion compensation. One exemplary method comprises: receiving a wrap-around motion compensation flag; determining whether a wrap-around motion compensation is enabled based on the wrap-around motion compensation flag; in response to a determination that the wrap-around motion compensation is enabled, receiving data indicating a difference between a width of the picture and an offset used for determining a horizontal wrap-around position; and performing a motion compensation according to the wrap-around motion compensation flag and the difference.

Abstract: The present disclosure provides systems and methods for performing residual coding of video data. According to certain disclosed embodiments, the methods include: receiving control information for coding a video sequence; and determining, based on the control information, a coding method for coding a prediction residual signal of a coding block in the video sequence. The coding method is one of a transform residual coding and a transform-skip residual coding.

Abstract: The present disclosure provides a computer-implemented method for video processing. The method includes receiving a bitstream; and decoding the bitstream to form/generate/output a video sequence. The decoding includes decoding a flag indicating whether a subblock transform (SBT) intra mode is applied for a current coding unit (CU), wherein the current CU is coded in an intra prediction mode; in response to the flag indicating the SBT intra mode is applied, determining a sub-mode of the SBT intra mode; and decoding residuals of a sub-block based on the sub-mode.

Abstract: A method for encoding video data includes: determining motion vector predictors (MVP) for a target block based on control point motion vectors (CPMV), in which a bilinear model is represented by the CPMVs; determining motion vector differences (MVD), in which each motion vector difference is based on a difference between the corresponding MVP and the CPMV for each control point; and setting the MVDs in a bitstream, in response to the bilinear model being used.

Abstract: The present disclosure provides a computer-implemented method for video processing. The method includes receiving a video sequence; and encoding the video sequence by: determining a block size of a block; determining whether the block size is included in a first list; in response to the block size is not included in the first list, determining whether the block size is included in a second list; in response to the block size is included in the second list, selecting a neural network model for the block size and performing downsampling on the block based on the block size and the neural network model; and performing a neural network-based intra prediction (NNIP) on the block using the neural network model.

Abstract: A method of decoding a bitstream to output one or more pictures for a video stream includes: receiving a bitstream; and decoding, using coded information of the bitstream, one or more pictures. The decoding includes: determining a first motion vector predictor (MVP) and a second motion vector predictor (MVP) for a bi-predictive block coded in an advanced motion vector prediction (AMVP) mode, in which the first MVP is obtained from a first reference picture, and the second MVP is obtained from a second reference picture; and applying at least one of a decoder-side motion vector refinement (DMVR) process or a bilateral matching (BM) process based on a bilateral matching cost to refine at least one of the first MVP or the second MVP.

Abstract: Methods and apparatuses are provided for motion template-matching-based motion refinement. An exemplary method includes: dividing a target coding block into a plurality of subblocks; determining a first plurality of templates associated with the plurality of subblocks; determining a plurality of reference templates based on the first plurality of templates; performing motion compensation to the target coding block based on an affine merge candidate; and refining the motion compensation by matching the first plurality of templates and the plurality of reference templates.

Abstract: A video decoding method using a subblock temporal motion prediction for regular inter mode (sbAmvp mode). The method includes: receiving a bitstream comprising one or more syntax elements signaling coding unit (CU) level motion information associated with a CU, wherein the CU is encoded using regular inter mode; dividing the CU into a plurality of subblocks; and performing the sbAmvp mode on the plurality of subblocks. Performing the sbAmvp mode includes: deriving motion information for a subblock of the plurality of subblocks based on the signaled CU-level motion information.

Abstract: The present disclosure provides computer-implemented methods for video processing. The method includes receiving a video sequence; and encoding the video sequence by determining whether a collocated block in a collocated picture of a current block has a block vector (BV); in response to the collocated block having the BV, determining the BV; determining a motion vector for Temporal Motion Vector Prediction (TMVP) for the current block based on the BV of the collocated block; and determining a reference index of the TMVP to be a reference index of the collocated picture.

Abstract: Embodiments contemplate coding video data by generating a video encoded bitstream that may include reference picture set (RPS) extensions for inter-layer reference pictures, and the extensions may include inter-layer delta Picture Order Counts (POCs). Embodiments may also include signaling that lower layer reference pictures may be available in a lower layer decoder picture buffer (DPB), and/or an aggregate DPB, that may be added to the RPS set of a higher layer. The bitstream may include a signal indicating whether the higher layer RPS may be specified by a lower layer RPS, and the lower layer RPS may be temporal, inter-layer prediction (ILP), or both.

Abstract: Methods and apparatuses are provided for encoding and decoding video data based on a supplemental enhancement information (SEI) message. An exemplary method includes: generating a reconstrued frame sequence based on a compressed video; decoding a supplemental enhancement information (SEI) message with respect to the reconstrued frame sequence, according to the compressed video; and performing temporal upsampling to the reconstrued frame sequence based on the SEI message by using a neural network.

Abstract: A VVC-standard encoder and a VVC-standard decoder are provided, implementing derivation of a BCW index according to cost values based on template matching. A template matching cost can be calculated for each among a set of possible BCW weight values, and a BCW weight value yielding a lowest template matching cost among each template matching cost calculated can be selected as a BCW index for a bi-predicted merge candidate. Alternatively, a template matching cost can be calculated for each among a subset of possible BCW weight values based on an inherited BCW weight. Additionally, a merge candidate BCW index can be derived while adjusting template matching cost of an inherited BCW weight from a value calculated according to the VVC standard and ECM specifications, or while adjusting template matching cost of a BCW weight having equal weight from a value calculated according to the VVC standard and ECM specifications.