Abstract: A method and apparatus Inter prediction for video coding including IBC (Intra Block Copy) coding tool are disclosed. According to one method, a current permitted band inside the current picture for the current block is identified. A target IBC candidate is selected, where a target block vector of the target IBC candidate points from the current block to a target reference block in the current picture. An adjusted candidate list is generated by taking into account of the target IBC candidate and the current permitted band. The current motion information associated with the current block is encoded using the adjusted candidate list at the video encoder side or decoded using the adjusted candidate list at the video decoder side using the adjusted candidate list. In another method, a syntax for a target MVD (Motion Vector Difference) is decoded without sign information or with reduced sign information of the target MVD.

Abstract: A method and apparatus for a video coding system with the current picture referencing (CPR) mode enabled are disclosed. According to one method, the luma and chroma blocks of the current image are jointly coded using a same coding unit (CU) structure if the CPR mode is selected for the luma and the chroma blocks. Alternatively, if the luma and chroma components are partitioned into the luma and the chroma blocks separately using separate CU structures, the luma and chroma blocks are encoded or decoded using a coding mode selected from a coding mode group excluding the CPR mode. According to another method, the luma and chroma blocks of the current image are coded separately using a different CU structure if the CPR mode is selected for the luma and chroma blocks. In yet another method, reconstructed reference data is disclosed for the CPR mode with CU equal to PU.

Abstract: A methods and apparatus for block partition in video encoding and decoding are disclosed. According to one method, a current data unit is partitioned into initial blocks using inferred splitting without split-syntax signalling. The initial blocks comprises multiple initial luma blocks and multiple initial chroma blocks, and size of the initial luma block is M×N, M and N are positive integers and the current data unit is larger than M×N for the luma component. A partition structure is determined for partitioning each initial luma block and each initial chroma block into one or more luma CUs (coding units) and one or more chroma CUs respectively. The luma syntaxes and the chroma syntaxes associated with one initial block in the current data unit are signalled or parsed, and then the luma syntaxes and the chroma syntaxes associated with one next initial block in the current data unit are signalled or parsed.

Abstract: Method and apparatus of video coding using decoder derived motion information based on bilateral matching or template matching are disclosed. According to one method, merge index for merge candidate group comprising bilateral matching merge candidate and/or template matching merge candidate are signalled using different codewords. According to another method, the first-stage MV or the first-stage MV pair is used as an only initial MV or MV pair or used as a central MV of search window for second-stage search. According to yet another method, after the reference template for a first reference list is found, the current template is modified for template search in the other reference list. According to yet another method, the sub-PU search is disabled for the template search. According to yet another method, block difference calculation is based on reduced bit depth during MV search associated with the decoder-side MV derivation process.

Abstract: Video processing methods include receiving input data of a current block in a current picture, determining if a luma component and chroma components of the current block are coded using different splitting trees, disabling Adaptive Colour Transform (ACT) on the current block when the luma component and the chroma components of the current block are coded using different splitting trees, and encoding or decoding the current block. ACT is only allowed to be performed on blocks coded in single tree block partitioning to convert a RGB colour space into an YCoCg colour space. ACT is applied to residues according to some embodiments, or ACT is applied to input data and predictors according to some other embodiments.

Abstract: Method and apparatus of video coding are disclosed. According to the method, a boundary region in the current block is determined. For each pixel in the boundary region, an Intra predictor and an Inter predictor care derived. An Intra-Inter predictor is generated by blending the Intra predictor and the Inter predictor. Pixels in the boundary region of the current block are encoded or decoded using the Intra-Inter predictor. For the remaining pixels in the current block not belonging to the boundary region, the pixels are encoded or decoded using the Inter predictor or the Intra predictor. In another method, the Intra-Inter prediction process is implemented by scaling the sum of the Intra weighting factor and the Inter weighting factor is scaled to a power-of-2 number to avoid the need for the division operation. In yet another method, the Intra-Inter prediction is applied depending on the current block size.

Abstract: A video decoder parses a sequence parameter set (SPS) that is applicable to a current sequence of video pictures that includes the current picture, the SPS comprises a first dependent quantization flag and a first sign hiding flag. When the first dependent quantization flag indicates that dependent quantization is enabled for the current sequence, the decoder parses a second dependent quantization flag for indicating whether dependent quantization is used for quantizing the one or more slices of the current picture. When the second dependent quantization flag indicates that dependent quantization is not used for one or more slices of the current picture and the first sign hiding flag indicates that sign hiding is enabled for the current sequence, the decoder parses a second sign hiding flag for indicating whether sign hiding is used for quantizing the one or more slices of the current picture.

Abstract: Method and apparatus of coding a video sequence are disclosed, wherein Reference Picture Resampling (RPR) mode is included as a coding tool. According to the method, a bitstream corresponding to encoded data of the video sequence is generated or received, where the bitstream includes one or more syntaxes related to the RPR mode when the RPR mode is enabled, and scaling information for the RPR mode is derived using first information including said one or more syntaxes, and wherein said one or more syntaxes are constrained by taking into account a value corresponding to Max(8, (minimum coding block size for a luma component)). A target picture of the video sequence is encoded or decoded utilizing the scaling information when the RPR mode is enabled for the target picture.

Abstract: A video data processing method includes receiving input data associated with a current block in a current picture, wherein the current picture is partitioned into multiple non-overlapped blocks, and recursively splitting the current block into multiple leaf blocks based on a location of the current block in the current picture. The recursively splitting operation includes, when the location of the current block satisfies with a first condition, recursively splitting the current block according to a quadtree split, and, when the location of the current block satisfies with a second condition, recursively splitting the current block according to a selected split determined from a group comprising a vertical binary tree split and a horizontal binary tree split. The method further includes encoding or decoding the current block by individually processing each leaf blocks in the current block for prediction and transform processing.

Abstract: A system and method of content adaptive pixel intensity processing are described. The method includes receiving a predefined set of processed video data configured from the processed video data, deriving a range information associated with an original maximum value and an original minimum value for a predefined set of original video data, wherein the predefined set of processed video data is derived from the predefined set of original video data, and adaptively clipping pixel intensity of the predefined set of processed video data to a range deriving from the range information, wherein the range information is incorporated in a bitstream and represented in a form of the original maximum value and the original minimum value, prediction values associated with a reference maximum value and a reference minimum value, or a range index associated with a predefined range set.

Abstract: A method and apparatus of encoding or decoding for a coding system, where bi-directional CU (coding unit) weighting (BCW) is enabled for the coding system to allow using multiple pairs of weights, are disclosed. According to this method, a Merge candidate list is generated for the current block, where current bi-directional CU weights for a bi-directional predictor of the current block associated with a target Merge candidate in the Merge candidate list are set to a pre-define pair of weights when the target Merge candidate corresponds to a selected Merge candidate. In another method, current bi-directional CU weights for a bi-directional predictor associated with a target Merge candidate in the Merge candidate list are inherited from the target Merge candidate when the target Merge candidate corresponds to a selected Merge candidate.

Abstract: Video processing methods and apparatuses for processing video pictures referring to a high-level syntax set include receiving input data, determining a first syntax element indicating whether reference picture resampling is disabled or constrained, determining a second syntax element indicating whether subpicture partitioning is disabled or constrained, and encoding or decoding the video pictures. The first and second syntax elements are restricted to disable or constrain subpicture partitioning when reference picture resampling is enabled or disable or constrain reference picture resampling when subpicture partitioning is enabled. The first syntax element and the second syntax element are syntax elements signaled in the high level syntax set.

Abstract: Method and apparatus for coding system using affine motion model are disclosed. According to one method, a neighbouring block set of the current block comprising multiple spatial neighbouring blocks and one or more collocated blocks is determined for the current block. One or more constructed affine MVP candidates are derived for an affine MVP candidate list based on CP (control-point) MVs (motion vectors) at multiple spatial neighbouring blocks and said one or more collocated blocks. One constructed affine MVP candidate without one temporal MV is checked and inserted into the affine MVP candidate list before any constructed affine MV with one temporal MV. The current block or motion information of the current block is then encoded or decoded based on the affine MVP candidate list.

Abstract: Method and apparatus of using an Inter coding tool and OBMC (Overlapped Block Motion Compensation) are disclosed. According to one method, when the neighboring block is bi-prediction coded, the neighboring block is treated as a uni-prediction block by deriving an associated OBMC predictor based on uni-prediction motion information derived from the neighboring block. According to another method, when OBMC is applied depending on one or more constraints, an OBMC syntax is signaled conditionally at the encoder side or the OBMC syntax is parsed conditionally at the decoder side for the current block, where the OBMC syntax indicates whether the OBMC is applied to the current block.

Abstract: Method and apparatus of video coding are disclosed. According to one method, the left reference boundary samples and the top reference boundary samples are checked jointly. According to another method, selected original left reference boundary samples and selected original top reference boundary samples at specific positions are used for predictor up-sampling. According to yet another method, the horizontal interpolation and the vertical interpolation are in a fixed order regardless of a shape of the current block, size of the current block or both.

Abstract: Method and apparatus of video coding are disclosed. According to one method, the left reference boundary samples and the top reference boundary samples are checked jointly. According to another method, selected original left reference boundary samples and selected original top reference boundary samples at specific positions are used for predictor up-sampling. According to yet another method, the horizontal interpolation and the vertical interpolation are in a fixed order regardless of a shape of the current block, size of the current block or both.

Abstract: Methods for coding syntax related to palette coding generated in a video coding system are disclosed. According to one embodiment, the current block size checked against the pre-defined block size. If the current block size is larger than the pre-defined block size, a current coding mode is selected from a coding group excluding a palette coding mode. If the current block size is smaller than or equal to the pre-defined block size, the current coding mode is selected from a coding group including the palette coding mode. In another embodiment, if the current block size is greater than a maximum transform size, a current coding mode is selected from a coding group excluding a palette coding mode. If the current block size is smaller than or equal to the maximum transform size, the current coding mode is selected from a coding group including the palette coding mode.

Abstract: Method and apparatus of video coding using a multi-layer prediction mode, are disclosed. According to one method, a bitstream is generated at an encoder side or received at a decoder side, where the bitstream corresponds to coded data of current video data in a current layer. The bitstream complies with a bitstream conformance requirement corresponding both the bit depth values for the current layer and the reference layer being the same and the chroma format index values for the current layer and the reference layer being the same. The current video data in the current layer is then encoded or decoded by utilizing reference video data in the reference layer.

Abstract: Method and apparatus of coding a video sequence, are disclosed. According to the 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 complies with a bitstream conformance that one or more constraints are satisfied. The constraints are related to a set of RPR (Reference Picture Resampling) parameters including scaling window width or height of a current picture, scaling window width or height of a reference picture, current picture width or height, and maximum picture width or height specified for the video sequence. Scaling information for the RPR mode is derived using the set of RPR parameters. A target picture of the video sequence is then encoded at the encoder side or decoded at the decoder side by utilizing the scaling information when the RPR mode is enabled for the target picture.

Abstract: Methods and apparatus for a coding system using palette mode coding for colour video are disclosed. According to method, when the palette mode is enabled, separate coding of luma and chroma components is disabled or if separate coding of luma and chroma components, the palette mode is disabled. According to another method, when the palette mode is enabled for the current image, palette mode coding is only applied to the luma blocks and non-palette mode coding is applied to the chroma blocks. According to yet another method, palette mode coding is applied to the luma blocks using luma palettes if the palette mode is selected for the luma blocks and palette mode coding applying to the chroma blocks using chroma palettes if the palette mode is selected for the chroma blocks. According to yet another method, the scan direction for a non-square CU depends on the shape of the non-square.