Sharp Kabushiki Kaisha Corporation

Fg Innovation Company Limited

Frank Bossen

Christopher A Segall

Kiran Mukesh Misra

Sachin G Deshpande

Weijia Zhu

Philip Cowan

Jie Zhao

Byeongdoo Choi

Tomohiro Ikai

Yukinobu Yasugi

Eiichi Sasaki

Jonatan Samuelsson

Michael Horowitz

Christopher Andrew Segall

This disclosure relates to video coding and more particularly to techniques for performing motion vector prediction. According to an aspect of an invention, a motion vector and a corresponding reference picture identifier for the motion vector are received; a reference picture corresponding to a second motion vector is determined based on the reference picture corresponding to the received motion vector and a current picture; a scaling value is determined based on the determined reference picture, the reference picture corresponding to the received motion vector, and the current picture; and the second motion vector is generated from the received motion vector by scaling with the scaling value.

Systems and methods for performing motion vector prediction using a derived set of motion vectors

A video coding device may be configured to perform video coding according to one or more of the techniques described herein.

Systems and methods for reducing a reconstruction error in video coding based on a cross-component correlation

This disclosure relates to video coding and more particularly to techniques for performing a position-dependent intra prediction sample filtering process. In one example, a method of coding video data comprises: deriving an intra prediction angle parameter; deriving an inverse angle parameter based on the intra prediction angle parameter; for a prediction mode included in a defined set of prediction modes, setting a value of a scale variable based on the derived inverse angle; and performing a position-dependent intra prediction sample filtering process using the value of a scale variable.

Systems and methods for performing intra prediction coding in video coding

A method of signaling parameters for video data is disclosed. The method comprising: signaling a syntax element indicating a size constraint for subsets of a network abstraction layer unit including a slice of video data.

Systems and methods for reducing latency in decoding of coded video data

This disclosure relates to video coding and more particularly to techniques for signaling picture information in a slice header for coded video. According to an aspect of an invention, a first flag syntax element specifying whether a picture header is present in a slice header is parsed; a second flag syntax element, specifying a luma mapping is used for a current slice or a luma mapping with a chroma scalling is not used for a current slice, and a third flag syntax element, specifying whether a scaling information for the current slice is derived, are parsed based on the first flag syntax element.

Systems and methods for signaling picture information in a slice header in video coding

This disclosure relates to video coding and more particularly to techniques for performing deblocking of reconstructed video data. According to an aspect of an invention, reconstructed video data having a 4:2:2 chroma format is received and for a four line decision segment corresponding to a vertical deblocking boundary for a chroma component of the video data, a gradient value is computed using samples included in the first and fourth lines.

Systems and methods for applying deblocking filters to reconstructed video data

A method of filtering reconstructed video data is disclosed. The method comprising: inputting reconstructed luma component sample values; deriving a filtered sample value by using cross component filter coefficients and the reconstructed luma component sample values prior to an adaptive loop filtering process; deriving a refinement value for chroma components by using the filtered sample value; and deriving a refined chroma sample value by using a sum of a sample value of chroma components and the refinement value for chroma components.

A method of decoding video data is disclosed. The method comprising: receiving a first array of prediction sample values; receiving a second array of prediction sample values; determining a scale value based on a color component index value and a video sampling format of the video data; and generating a third array of prediction sample values by applying a blending value to the first array of prediction sample values and the second array of prediction sample values, wherein the blending value is based on the scale value.

Systems and methods for performing inter prediction coding in video coding

A method of filtering reconstructed video data is provided. The method receives an array of reconstructed luma samples including a P-block and a Q-block that are both adjacent to an intra sub-partitions (ISP) edge, and determines a first maximum filter length based on whether a first size of an edge of one of the P-block and the Q-block is less than 32. The edge of the one of the P-block and the Q-block is perpendicular to the ISP edge. The method further deblocks the array of the reconstructed luma samples based on the determined first maximum filter length.

A method of filtering reconstructed video data is disclosed. The method comprising: parsing a first syntax element used for setting cross-component filter coefficients; inputting a reconstructed luma picture sample array; deriving luma locations by using location corresponding to a current chroma sample; deriving a filter coefficient array by using the cross-component filter coefficients; deriving a variable by using the filter coefficient array and the reconstructed luma picture sample array defined by the luma locations; and deriving a scaled variable by using the variable, wherein the variable is modified by a sum of a sample of a current chroma block, which is defined by a predetermined location, and the scaled variable.

A non-transitory computer-readable medium of a device storing computer-executable instructions is provided. When the instructions are executed by one or more processors of the device, the instructions cause the device to: decode a merge subblock flag that specifies whether subblock-based inter prediction parameters for a coding unit are inferred from neighboring blocks and that determines whether a motion vector difference merge flag and a combination flag are to be decoded; determine a value of the merge subblock flag; decode the motion vector difference merge flag after the value of the merge subblock flag is determined as being equal to zero and a value of a motion vector difference flag is determined as being equal to one; and decode the combination flag that specifies whether a combined inter-picture merge and intra-picture prediction is applied to the coding unit by using the merge subblock flag and a sequence parameter set (SPS) flag.

Non-transitory computer-readable medium and device for performing inter prediction in video coding

A method of performing motion vector prediction for coding video data is disclosed. A full precision motion vector mv is determined for generating a prediction for video block in a first picture. A rounded motion vector rmv having a less precision than the full precision motion vector mv is stored. A motion vector predictor candidate is generated for a video block in a second picture from the stored motion vector.

Methods for deriving a motion vector prediction in video coding

Method, device, apparatus, and computer-readable storage medium to determine whether video block is a fractional boundary video block (See paragraph and FIG..) and to partition the fractional boundary video block into inferred partitions using a subset of available partition modes (See paragraph and FIG..) are disclosed.

Method of partitioning video data, device for decoding video data, and device for coding video data

Systems and methods for performing motion vector prediction for video coding are disclosed. A motion vector predictor is determined based at least in part on motion information associated with a selected motion vector predictor origin and offset values corresponding to a selected sampling point. The sampling point is specified according to a set of direction and distance on a sampling map for the motion vector predictor origin.

Systems and methods for performing motion vector prediction for video coding using motion vector predictor origins

This disclosure relates to video coding and more particularly to techniques for intra prediction coding. In one example, a method of decoding video data, the method comprising: parsing a first syntax element having a value indicating an intra sub partitions (ISP) intra prediction is used for coding a current video block; parsing a second syntax element indicating whether a most probable mode (MPM) or a non-most probable mode (MPM) is an intra prediction mode used for generating a prediction for the current video block according to the ISP intra prediction; based on whether the second syntax element indicates the MPM or the non-MPM is an intra prediction mode used for generating a prediction, conditionally parsing one of: a third syntax element indicating the MPM, or a fourth syntax element indicating the non-MPM; and generating a prediction for the current video block based on the first syntax element.

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Vancouver, WA, United States of America

Frank Bossen