Abstract: The present disclosure provides an encoding method, wherein the method comprises: determining syntax elements to be coded, wherein the syntax elements include a reference picture list structure and at least one high-level syntax (HLS) weighted prediction parameters; coding the at least one HLS weighted prediction parameters; and after coding the at least one HLS weighted prediction parameters, coding the reference picture list structure. The syntax elements are reordered such that coding the reference picture list structure can be based on values of the at least one HLS weighted prediction parameters.

Abstract: An intra-prediction apparatus and method are provided for extending a set of predetermined directional intra-prediction modes of a rectangular video coding block. The intra-prediction apparatus determines an aspect ratio of the rectangular video coding block, and determines a complementary angle range based on the aspect ratio. The apparatus then selects a complementary direction within the complementary directional range, and adds an extension directional intra-prediction mode associated with the complementary direction to the set of predetermined directional intra-prediction modes. Based on the extension directional intra-prediction mode, the apparatus intra-predicts pixel values of pixels of the rectangular video coding block.

Abstract: A method for a Sample Adaptive Offset (SAO) in-loop filtering process for a reconstructed picture, the method comprising: obtaining a reconstructed picture sample array; obtaining a value of the size of a current coding tree unit (CTU); obtaining at least one SAO parameter; comparing the value of the size of the current CTU with a predefined threshold, and upon determining that a value of the size of the current CTU is smaller than the predetermined threshold, setting a value of the size of a sample-adaptive offset (SAO) region to be equal to the predefined threshold; and performing a SAO process on the samples comprised in a the SAO region based on the at least one SAO parameter, wherein the SAO region is defined according to the value of the size of the SAO region.

Abstract: Devices and methods for video coding are described. One method comprises receiving a bitstream, wherein the bitstream comprises prediction related information, and wherein the prediction related information includes at least one of: numbers and positions of available primary reference samples, an intra prediction mode index, or a size of the current coding block; determining whether a bidirectional intra prediction (BIP) flag is signaled in the bitstream based on the prediction related information; and reconstructing the picture.

Abstract: A method, a device, and a computer program product, for aspect-ratio dependent filtering for intra-prediction include obtaining an aspect ratio of a block to be predicted, wherein the aspect ratio is based on a width of the block and a height of the block, and selecting an interpolation filter for the block to be predicted based on the aspect ratio of the block to be predicted.

Abstract: A video coding block is intra-predicted on the basis of reference samples from a set of neighboring video coding blocks. A preliminary fitting plane, defined by a set of preliminary fitting plane parameters, is determined on the basis of the reference samples. Those preliminary fitting plane parameters whose parameter value lies outside a predefined range of allowable parameter values are clipped to an adjusted parameter value inside the predefined range. Those preliminary fitting plane parameters whose parameter value lies within the predefined range of allowable parameter values are maintained. An adjusted fitting plane is determined on the basis of the clipped fitting plane parameters and the unclipped fitting plane parameters. The adjusted fitting plane defines a plurality of fitting samples. The samples of the current video coding block are defined on the basis of the plurality of fitting samples.

Abstract: A method of intra predicting a block of a picture, comprising determining a predicted sample value from one or more reference sample values by intra-prediction using an intra prediction mode selected from one of a DC intra-prediction mode, a planar intra prediction mode, and an angular intra-prediction mode; determining a first and second weights based on the intra prediction mode and one of the height of the block, the width of the block, or both; calculating an additional value as a weighted sum of a top reference sample value and a left reference sample value; multiplying the predicted sample value by a sample weighting factor, resulting in a weighted predicted sample value; adding the additional value to the weighted predicted sample value, resulting in a non-normalized modified predicted sample value; and normalizing the non-normalized modified predicted sample value.

Abstract: The present disclosure provides a method and apparatus for Local Illumination Compensation (LIC) for inter-prediction that uses a MinMax method to derive linear model parameters for the LIC. Values of parameters ? and ? for the linear model of the LIC are derived, based on reconstructed neighboring samples of the current block and reconstructed neighboring samples of the reference block. When a condition for the value of ? is met, the value of ? is clipped based on the value of ? and the value of ? is updated based on the clipped value of ? before updating the inter-predicted sample values for the current block.

Abstract: A method for picture or video encoding, wherein a block of residual signal is being subsampled before transform, quantization and residual coding, comprising obtaining a residual signal from an original picture and a predicted block; obtaining a subsampled block from samples of a near-boundary region of a block of residual signal, wherein the subsampled block has a smaller size than the block of residual signal; performing forward transform over the subsampled block; performing quantization over the subsampled block to obtain a subsampled quantized residual block; performing residual coding of the subsampled quantized residual block; obtaining a subsampled reconstructed residual block by inverse quantization and inverse transform of the subsampled quantized residual block; obtaining a reconstructed residual block by filling samples of the near-boundary region of the reconstructed residual block from the subsampled reconstructed residual block; and obtaining a reconstructed block from the predicted block and t

Abstract: A method and apparatus for adaptively processing video samples in a video signal frame, the video samples being arranged in a Largest Coding Unit. The method comprises extracting a plurality of video samples from the Largest Coding Unit, calculating a correction offset for a first video sample of the extracted plurality of video samples upon the basis of a first value of the first video sample and a second value of a second video sample of the extracted plurality of video samples, and weighting the first video sample with the correction offset.

Abstract: A video coding block is intra-predicted on the basis of reference samples from a set of neighboring video coding blocks. A fitting plane is determined on the basis of the reference samples. The fitting plane defines a plurality of fitting samples. For a selected directional intra prediction mode, the sample values of the video coding block are predicted on the basis of the reference sample values and the fitting sample values.

Abstract: A method for intra prediction of a current chroma block, the method comprising: determining a filter for a luma block collocated with the current chroma block, wherein the determining process is performed based on a partitioning data; obtaining filtered reconstructed luma samples, by applying the determined filter to reconstructed luma samples of a luma block collocated with the current chroma block, and to luma samples in a selected position neighboring to the luma block; obtaining, based on the filtered reconstructed luma samples as an input, linear model parameters; and performing cross-component prediction based on the obtained linear model parameters and the filtered reconstructed luma samples of the luma block, to obtain prediction values of the current chroma block.

Abstract: The present invention relates to an improved apparatus and method for harmonizing both Sign Bit Hiding (SBH) and Residual Sign Prediction (RSP) techniques in video coding. In order to improve coding efficiency, a list of transform coefficients, to which RSP is to be applied is prepared in advance of selecting a coefficient to which SBH is applied. Thereby, the RSP list can be populated in such a manner that the highest coding efficiency may be expected. Subsequently, one or more coefficients for applying SBH are selected so as not to be included in the list.

Abstract: A picture encoding apparatus configured to hierarchically partition a block of picture data into sub-blocks; determine that a sub-block being coded belongs to an unequally-sized partitioned block; prepare a list of neighboring blocks for the sub-block of the unequally-sized partitioned block based on a size of the sub-block of the unequally-sized partitioned block and a partitioning type of at least one neighboring block of the unequally-sized partitioned block; and derive a context model that is used to encode split information of the sub-block of the unequally-sized partitioned block into a bit stream based on the prepared list of neighboring blocks.

Abstract: Devices and methods of intra prediction of a block of a picture are provided. The method includes obtaining reference samples of a block, and determining a value of a predicted sample based on the reference samples and an intra prediction mode. The method further includes obtaining a value of a multiplier based on at least one dimension of the block, and normalizing the value of the predicted sample based on the value of the multiplier and a value of a shift. The intra prediction mode is INTRA_DC, or INTRA_BI, or horizontal intra prediction mode. By normalizing the value of the predicted sample based on the value of the multiplier and a value of a shift without division operation, the method could increase intra prediction efficiency.

Abstract: A method of decoding encoded video data for providing a residual video coding block is provided. An intra-prediction mode identifier is extracted from the encoded video data. The method includes: generating a predicted video coding block based on a selected intra-prediction mode; pre-selecting a plane-based intra-prediction mode and a further intra-prediction mode, when the extracted intra-prediction mode identifier is equal to a first predefined intra-prediction mode identifier; selecting the plane-based intra-prediction mode or the further intra-prediction mode, based on (a) an additional flag extracted from the encoded video data or (b) a deviation measure; restoring a video coding block based on the residual video coding block and the predicted video coding block. The deviation measure quantifies deviations of a plurality of reference samples from neighboring video coding blocks from a plurality of fitting samples defined by a fitting plane based on the plurality of reference samples.

Abstract: A method of intra prediction of a block, comprising obtaining two lines of reconstructed neighboring samples; deriving a set of reference samples based on the two lines of reconstructed neighboring samples; obtaining a set of MIP coefficients based on a intra prediction mode obtained from a bitstream, wherein a MIP coefficient CMIP of the set of MIP coefficients is obtained based on CMIP=vsgn·(q<<s), where q is a magnitude of the MIP coefficient, wherein s is a left shift value and vsgn is a sign value of the MIP coefficient; and obtaining a prediction block based on the set of reference samples and the set of MIP coefficients, wherein a reconstruct picture is obtained based on the prediction block.

Abstract: Devices and methods for intra prediction of DC intra prediction mode are provided. The method includes: obtaining a value of an intra prediction reference line index of a transform block; obtaining prediction samples of the transform block based on reference samples from a reference line. The reference line is indexed by the value of the intra prediction reference line index. The method introduces a harmonization of MRL and non-directional intra prediction (i.e. DC). The harmonization consists of aligning the reference samples from a reference line, which is indexed by the value of the intra prediction reference line index.

Abstract: The present invention relates to method and apparatus for motion vector derivation for affine based inter prediction of chroma subblocks based on chroma format. The method includes: determining chroma scaling factors in horizontal and vertical directions based on chroma format information, wherein the chroma format information indicates a chroma format of a current picture which the current image block belongs to; determining a set (S) of luma subblocks of the luma block based on values of the chroma scaling factors; determining a motion vector for a chroma subblock of the chroma block based on motion vectors of one or more luma subblocks in the set (S) of luma subblocks.

Abstract: Methods, systems, devices, and apparatus for image processing are provided. In one aspect, a method includes: intra-predicting a block of an image based on reference samples of the image, the reference samples being arranged in one or more reference sample sets each including a coherent set of reference samples and including one or more reference samples adjoining the block; segmenting each of the one or more reference sample sets into a sequence of three or more subsets including a first subset, a last subset, and one or more intermediary subsets located therebetween; determining a weight value for each subset, weight values of the one or more intermediary subsets being lower than weight values of the first subset and the last subset; fitting a plane to the reference samples of the image using the determined weight values; and generating an intra-predicted block based on the plane.