Abstract: An intra-prediction method includes: determining, by an intra-prediction apparatus, a directional intra-prediction mode for a rectangular video coding block from an extended set of directional intra-prediction modes, wherein the extended set of directional intra-prediction modes includes extended directional intra-prediction modes and conventional directional intra-prediction modes and determining, by the intra-prediction apparatus, a plurality of available reference samples based on a direction of the directional intra-prediction mode. The method further includes: intra-predicting, by the intra-prediction apparatus, pixel values of pixels of the rectangular video coding block based on the plurality of available reference samples.

Abstract: The present disclosure provides methods and devices of intra predicting a block of a picture. The method comprises for a sample of the block: obtaining a predicted sample value from one or more reference sample values by performing intra-prediction using a DC intra-prediction mode; multiplying the predicted sample value by a sample weighting factor to produce a weighted predicted sample value; adding an additional value to the weighted predicted sample value to produce a non-normalized predicted sample value; and normalizing the non-normalized predicted sample value by an arithmetic right shift; wherein the sample weighting factor is ((2<<p)?wL?wT), wherein p is a parameter of the sample weighting factor, wL is a horizontal weighting factor, and wT is a vertical weighting factor.

Abstract: A method for constructing a Most Probable Mode (MPM) list is provided. The method comprising: obtaining an intra prediction mode of a neighbor block adjacent to a current block; if the intra prediction mode of the neighbor block is not comprised in the MPM list and the intra prediction mode of the neighbor block is a directional (for example, angular) intra prediction mode, determining a quantity of predicted samples (N) of the current block according to positions of a set of reference samples on a boundary of the current block, N is an integer; if the N is greater than or equal to a threshold (for example, a first threshold), adding the intra prediction mode of the neighbor block into the MPM list.

Abstract: A method includes obtaining a first control parameter in a sequence parameter set (SPS) level, wherein a first value of the first control parameter in the SPS level indicates that a smoothing is not applied for any block of a sequence, a second value of the first control parameter in the SPS level indicates that the smoothing is applied for each block of the sequence, and obtaining a second control parameter in a slice header when a third value of the first control parameter in the SPS level is equal to a predefined value, wherein a first value of the second control parameter indicates that the smoothing is applied for each block of a slice.

Abstract: Pixel values of a current video coding block are intra predicted on the basis of a plurality of reference pixel values. A pixel value of a current pixel is intra predicted on the basis of: a first reference pixel value, wherein the first reference pixel is located in a first neighboring video coding block, a second reference pixel value, wherein the second reference pixel is located in a second neighboring video coding block, a distance between the current pixel and the first reference pixel, and a distance between the current pixel and the second reference pixel.

Abstract: A video coding device, comprising a sequence of filters that are configurable by one or more primary parameters and one or more secondary parameters, and a filter controller configured to adjust the one or more secondary parameters based on the one or more primary parameters and based on a strength criterion of the sequence of filters.

Abstract: Provided are a method, an apparatus, a computer program product and a non-transitory computer-readable medium for video coding. The method comprises performing an intra-prediction process of a block comprising samples to be predicted, wherein an interpolation filter is applied to reference samples of the block during the intra-prediction process of the block. The interpolation filter is selected on the basis of a subpixel offset between the reference samples and the samples to be predicted, and a size of a main reference side used in the intra-prediction process is determined according to a length of the interpolation filter and an intra-prediction mode that provides, out of a set of available intra-prediction modes, the greatest non-integer value of said subpixel offset, wherein the main reference side comprises the reference samples.

Abstract: A method for constructing a Most Probable Mode (MPM) list includes classifying each intra prediction mode derived from a neighboring block either as a valid or invalid subject to the mode direction and the position of its source block. Valid and invalid modes are considered most and least probable modes, respectively.

Abstract: An encoding apparatus is described for signaling an extension directional intra-prediction mode within a set of directional intra-prediction modes, the set of directional intra-prediction modes comprising predetermined directional intra-prediction modes and the extension directional intra-prediction mode. The encoding apparatus comprises a mode mapping unit selecting a predetermined directional intra-prediction mode, the selected predetermined directional intra-prediction mode being associated with an intra mode index, and mapping the extension directional intra-prediction mode onto the selected predetermined directional intra-prediction mode. A signaling unit generates a signaling indicator comprising at least one of the intra mode index and a flag value. An intra-prediction unit intra-predicts pixel values of pixels of a rectangular video coding block on the basis of the extension directional intra-prediction mode for providing a predicted rectangular video coding block.

Abstract: A method for intra reference sample filter switching for intra-prediction is described herein. The method comprises determining an intra prediction mode and an aspect ratio of a block to be predicted, and selecting an interpolation filter or a reference sample smoothing filter based on the intra prediction mode and the aspect ratio.

Abstract: The present disclosure provides methods and devices for intra-prediction of a current block in video encoding or decoding. The method comprises: performing intra-prediction processing of the current block according to a directional intra-prediction mode, comprising applying reference sample filtering or subpixel interpolation filtering to reference samples in one or more reference blocks, wherein the directional intra-prediction mode is classified into one of the following groups: (A) vertical or horizontal modes, (B) directional modes including diagonal modes that represent angles which are multiples of 45 degrees, (C) remaining directional modes; if the directional intra-prediction mode is classified as belonging to group B, a reference sample filter is applied to the reference samples; if the directional intra-prediction mode is classified as belonging to group C, an intra reference sample interpolation filter is applied to the reference samples.

Abstract: An intra-prediction apparatus removes a directional intra-prediction mode from a set of predetermined directional intra-prediction modes. The intra-prediction apparatus comprises: a reference sample determining unit configured to select the directional intra-prediction mode from the set of predetermined directional intra-prediction modes, and to determine a plurality of available reference samples; a directional intra-prediction mode removing unit configured to remove the directional intra-prediction mode from the set of predetermined directional intra-prediction modes if a length (LRSlonger) associated with the plurality of available reference samples is smaller than a multiple of a length (Llonger) of a first side of the video coding block for obtaining a reduced set; and an intra-prediction unit configured to intra-predict pixel values of pixels of the rectangular video coding block on the basis of the reduced set. The intra-prediction apparatus can further comprise an area determining unit.

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 device and method for intra-predicting a rectangular and non-square video coding block, the device including an intra-prediction apparatus configured for intra-predicting a rectangular and non-square video coding block according to a set of directional intra-prediction modes distributed over a set of directional ranges, where the intra-prediction apparatus being configured for configured for intra-predicting the rectangular and non-square video coding block includes the intra-prediction apparatus being configured to select a directional range from the set of directional ranges, and determine a number of directional intra-prediction modes of the selected directional range according to a size of a block.

Abstract: Methods, apparatus, and computer-readable storage media for intra prediction of a current block of a picture are provided. In one aspect, a method includes: calculating a preliminary prediction sample value of a sample of the current block based on reference sample values of reference samples located in reconstructed neighboring blocks of the current block, and calculating a final prediction sample value of the sample by adding an increment value to the preliminary prediction sample value, the increment value being based on a position of the sample in the current block.

Abstract: A method of video coding, wherein the method comprises inter-prediction processing of a first block, wherein the inter-prediction processing comprises subpixel interpolation filtering of samples of a reference block; intra-prediction processing of a second block, wherein the intra-prediction processing comprises subpixel interpolation filtering of reference samples; wherein the method further comprises selecting interpolation filter coefficients for the subpixel interpolation filtering based on a subpixel offset between integer reference sample positions and fractional reference samples' positions, wherein for the same subpixel offsets the same interpolation filter coefficients are selected for intra-prediction processing and inter-prediction processing.

Abstract: A method of intra prediction of a block in a picture of a video is disclosed. The method comprises obtaining an intra prediction mode of the block; determining whether the intra prediction mode of the block is a wide-angle mode; filtering reference samples for the block based, at least in part, upon determining that the intra prediction mode of the block is the wide-angle mode; and generating predicted samples of the block based on filtered reference samples.

Abstract: The present application relates to the field of picture processing, for example still picture/image and/or video picture/image coding. In particular, the application relates to a device and corresponding method for intra-predicting a prediction block of a video image. The device is configured to select a directional intra-prediction mode from a set of directional intra-prediction modes, where each directional intra-prediction mode corresponds to a different intra-prediction angle. Further, the device is configured to select a filter from a set of filters based on the selected directional intra-prediction mode. Further, the device is configured to determine, for a given prediction sample of the prediction block, a reference sample from a set of reference samples based on the selected directional intra-prediction mode, and apply the selected filter to the determined reference sample.

Abstract: A device is configured to select a directional intra-prediction mode from a set of directional intra-prediction modes, wherein each directional intra-prediction mode corresponds to a different intra-prediction angle. Further, the device is configured to select a filter from a set of filters based on the selected directional intra-prediction mode. Further, the device is configured to determine, for a given prediction sample of the prediction block, a reference sample from a set of reference samples based on the selected directional intra-prediction mode, and apply the selected filter to the determined reference sample.

Abstract: A method for intra prediction of a current block of a picture is provided. The method includes obtaining an aspect ratio of the current block according to a width and a height of the current block; obtaining a weighting factor based on the aspect ratio, and determining an intra-prediction value of the current block based on the weighting factor. Intra-prediction value of a current block may be obtained with high accuracy or low computational complexity, so as to improve coding efficiency.