HFI INNOVATION INC.

A method and apparatus for signaling or parsing picture partition information for determining a partitioning of the current picture into one or more slices in a raster-scan slice mode are disclosed. Each of the one or more slices comprises one or more consecutive complete tiles in a tile raster scan order or one or more consecutive complete CTU rows within a tile. The picture partition information indicates whether one of the slices contains one or more consecutive complete tiles. The picture partition information further indicates whether one of the slices contains one or more consecutive complete CTU rows within one of the tiles.

Exemplary video processing methods and apparatuses for encoding or decoding a current block by inter prediction are disclosed. Input data of a current block is received and partitioned into sub-partitions and motion refinement is independently performed on each sub-partition. A reference block for each sub-partition is obtained from one or more reference pictures according to an initial motion vector (MV). A refined MV for each sub-partition is derived by searching around the initial MV with N-pixel refinement. One or more boundary pixels of the reference block for a sub-partition is padded for motion compensation of the sub-partition. A final predictor for the current block is generated by performing motion compensation for each sub-partition according to its refined MV. The current block is then encoded or decoded according to the final predictor.

A method and apparatus for signaling or parsing picture partition information are disclosed. According to one method, a syntax related to a number of tiles in a target slice is signaled at an encoder side or parsed at a decoder side if the address of the target slice does not correspond to a last tile index of the current picture and the raster-scan slice mode is used for picture partition. The syntax is signaled or parsed from a slice header level of the video bitstream corresponding to the target slice. According to another method, a control syntax is signaled at an encoder side or parsed at a decoder side only if the picture partition information indicates more than one tile existing in the current picture. The control syntax indicates whether in-loop filtering is applied across tile boundaries.

Methods, apparatus, and computer readable media configured to determine motion vectors for encoders and decoders are disclosed. A decoder receives compressed video data related to a set of frames. The decoder calculates, using a decoder-side predictor refinement technique, a new motion vector for a current frame from the set of frames, wherein the new motion vector estimates motion for the current frame based on one or more reference frames. The calculation includes retrieving a first motion vector associated with the current frame, executing a first portion of the decoding process using the first motion vector, retrieving a second motion vector associated with the current frame that is different than the first motion vector, and executing a second portion of the decoding process using the second motion vector.

A method of video decoding at a decoder can include receiving a bitstream including encoded data of a picture, decoding a plurality of coding units (CUs) in the picture based on motion information stored in a history-based motion vector prediction (HMVP) table, resetting the HMVP table for every N CTU rows. The method also provides updating the HMVP table with the motion information of the last Q of the plurality of CUs.

A video processing method comprises receiving input data of a current block, checking if the current block satisfies one or more predefined criteria, setting the current block to be a root block if the current block satisfies the predefined criteria, one or more color components of one or more blocks in the current block are not checked with the predefined criteria if the current block is a root block, encoding or decoding the one or more color components of one or more blocks in the current block using neighboring reconstructed samples of the one or more color components of the current block as reference samples if the current block is a root block. Each block in the current block is encoded or decoded using neighboring reconstructed samples of each block in the current block as reference samples if the current block is not a root block.

Video processing methods for coding a current block comprise receiving input data of a current block, checking whether a sub-block motion compensation coding tool is applied to the current block based on a size, width, or height of the current block, a size, area, shape, width, or height of sub-blocks partitioned from the current block, an inter prediction direction of a sub-block Motion Vector (MV), primary MV, or one of control point MVs of the current block, a primary MV, the control point MVs, affine parameters; encoding or decoding the current block using the sub-block motion compensation coding tool or another coding tool according to a result of the checking indicating whether application of the sub-block motion compensation coding tool is valid or invalid; and a MV clipping process is applied to each sub-block in the current block if the checking result is false, indicating the validity is invalid.

Methods and apparatus for video coding are disclosed. According to this method, a bitstream corresponding to encoded data of the video sequence is generated at an encoder side or received at a decoder side, where the bitstream comprises a first syntax related to AMVR precision, and wherein the syntax related to the AMVR precision is coded by context coding bins with at least two contexts. One or motion vectors for the target block are encoded, at the encoder side, or decoded, at the decoder side, utilizing information comprising the AMVR precision.

Image or video processing methods and apparatuses comprise receiving input data associated with a current picture or a current slice in the current picture, determining whether the current picture is a monochrome picture, conditionally signaling or parsing chroma deblocking parameters depending on whether the current picture is a monochrome picture, and encode or decode the current picture or current slice. The chroma deblocking parameters are used in a deblocking filter operation applied to chroma components of the current picture or current slice when the current picture is not a monochrome picture. A syntax element may be used to indicate derivation of chroma deblocking parameters, and based on a value of the syntax element, the chroma deblocking parameters are allowed to be explicitly signaled in or parsed from a syntax structure, or the chroma deblocking parameters are implicitly inferred.

Encoding methods and apparatuses comprise determining parameters of a specific process for a current slice, signaling in one or more Adaptive Parameter Sets (APSs), performing the specific process using the parameters, signaling an APS ID of each signaled APS in a slice header, and encoding the current slice. Each APS is classified into a category according to a type of data carried by the APS. The APS ID of each signaled APS is counted in a category associated with the specific process and is independent of other categories. Decoding methods and apparatuses comprise parsing an APS ID of each referenced APS from a slice header of a current slice for a specific process, determining parameters from each referenced APS according to the parsed APS ID and a category associated with the specific process, performing the specific process on the current slice and decoding the current slice.