Tencent America LLC

Qualcomm Incorporated

Hefei Reliance Memory Limited

Lightwave Microsystems Corporation

Other

Neophotonics Corporation

Samsung Electronics Co., Ltd.

Lightwave Microsytstems Corporation

Liang Zhao

Shan Liu

Xin Zhao

Xiang Yang Li

Han Gao

Xiang Li

Jing Ye

Yixin Du

Zhichao Lu

Madhu Peringassery Krishnan

Jordan C Cookman

Cheng-Han Wang

Angelica Wong

Hong Sun Kim

Xiaozhong Xu

Guichun Li

Cheung Auyeung

Jie Wu

Le Nguyen Luong

Michael Kohlmann

Jin-Su Ko

Leena Zacharias

Parvathanathan Subrahmanya

Rayman Wai Pon

Fan Zhong

Krishnaranjan Rao

Pranav Iyengar

Daniel Carolin

Arnaud Meylan

Reza Shahidi

Amir Aminzadeh Gohari

Cormac S Conroy

Amit Mahajan

Chun-Hao Hsu

Roger Brockenbrough

Nitin Pant

Hao Xu

Vieri Vanghi

Kenneth McGreer

I-Hsiang Lin

Jeffrey Wong

Dinesh Kumar Devineni

Chang Shik Row

Jane Lam

Yushin Cho

Stephan Wenger

Leonid Sheynblat

Douglas Neal Rowitch

Daniel Fred Filipovic

Xiaoxin Zhang

Arnold Jason Gum

Dinesh Jagannath Alladi

Prasad Srinivasa Siva Gudem

Yi Zeng

Kentaro Yamamoto

David Loweth Winslow

Farnaz Parhami

Jongik Won

Balasubramanian Sivakumar

Paul A Conflitti

Sean Baker

Zhijie Xiong

Shishir Gupta

Calvin Ka Kuen Ho

Byeongdoo Choi

Aziz Gholmieh

Ling Li

Brian Clarke Banister

Dominic Gerard Farmer

Bhushan Shanti Asuri

Aristotele Hadjichristos

Roland Reinhard Rick

Shrenik Patel

Tevfik Yucek

Francis M Ngai

Feng Lu

Prashant Udupa Sripathi

Subramanya P Rao

Kevin Hsi Huai Wang

Prashanth Akula

Ming Yan

Koorosh Akhavan

Carl Hardin

Anup Savla

Arun Somani

Thomas S Tarter

Siva Penke

Anil Sahai

Emanuele Lopelli

Chan Hong Park

Calvin Ho

Wilson Long

Shriram Gurumoorthy

Rishabh Raj

Ravindra Chauhan

Brian P McGinnis

David James Quirke

Biao Wang

Madhu Peringassery Krishna

Coded information of a current block and neighboring blocks of the current block is received, where the current block is predicted in an intra directional mode. The intra directional mode of the current block is determined to be associated with an angle that is one of smaller than 90 degrees and larger than 180 degrees. In response to the intra directional mode of the current block being associated with the angle, whether a delta angle associated with the current block is a pre-defined delta angle is determined. In response to the delta angle associated with the current block not being the pre-defined delta angle, a single direction intra prediction and not a bi-direction intra prediction is applied to the current block. A sample of the current block is reconstructed based on an adjacent reference sample on a reference line that is determined according to the single direction intra prediction.

Angular intra prediction

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry receives a bitstream carrying a plurality of pictures, and determines at least a motion compensation padding (MCP) block that is located in an MCP area outside of a picture and next to a picture boundary of the picture. The processing circuitry derives, according to a plurality of candidates with positions located at the picture boundary within the picture, a motion vector of the MCP block for motion compensated boundary padding, and reconstructs at least a sample in the MCP block according to the derived motion vector for the motion compensated boundary padding.

On motion compensated picture boundary padding

The various implementations described herein include methods and systems for coding video. The methods include receiving a motion vector difference (MVD) of a video block from the video stream; in response to a determination that an adaptive MVD resolution mode of an inter prediction mode is signaled, searching for a first template of a prediction video block for the video block, and the first/second template is the neighboring reconstructed/predicted samples of the prediction video block/current block, and the prediction video block is a reconstructed/predicted forward or backward video block of the video block; locating the first template of the prediction video block that is a best match for a second template of the video block; refining a motion vector (MV) of the video block based on at least the second template, the located first template, and the MVD; and reconstructing/processing the video block based on at least the refined MV.

Systems and methods for template matching for adaptive MVD resolution

Various implementations described herein include methods and systems for coding video. In one aspect, a video bitstream includes a current image frame and a first syntax element. An electronic device determines that the first syntax element has a first predefined value indicating that the cross-component sample offset (CCSO) mode is enabled, and generates a set of adapted luma samples including an adapted first luma sample and its adapted neighboring luma samples based on a set of reconstructed luma samples. The reconstructed luma samples include a first luma sample that is collocated with a first color sample. The electronic device determines the first sample offset of the first color sample based on the adapted first luma sample and the one or more adapted neighboring luma samples. The current image frame is reconstructed at least by adjusting the first color sample based on the first sample offset.

CCSO with downsampling filters and sample position selection

Methods and systems for determining contexts for coding and decoding various syntax elements of a video stream in inter prediction modes are described. The methods and systems enable a limitation on numbers of possible coding contexts for syntax elements related to the inter prediction mode, and a selection of coding contexts for a current block based on coding information of spatially neighboring blocks and temporal motion prediction information.

Context design for coding and decoding syntax elements in inter prediction modes

This disclosure describes aspects of advanced video coding technologies and is particular related to cross-component sample offset (CCSO) filtering of reconstructed samples. For example, a quantizer for quantizing sample deltas in order to apply a CCSO filter may be constructed as an asymmetric quantizer with respect to zero sample delta. Either a symmetric or an asymmetric quantizer may be selected for processing sample deltas prior to applying a CCSO filter. An asymmetric quantizer may relate to a corresponding symmetric quantizer by a non-zero offset. Signaling of a selection of an asymmetric quantizer may be provided separately from or dependent on a signaling of a symmetric quantizer.

Cross component sample offset filtering with asymmetric quantizer

Aspects of the disclosure include methods, apparatuses, and non-transitory computer-readable storage mediums for video encoding/decoding. An apparatus includes processing circuitry that decodes prediction information of a coding unit in a video bitstream. The processing circuitry determines whether a luma block and a chroma block associated with the coding unit have different partitioning trees based on the prediction information. When the luma block and the chroma block have different partitioning trees, the processing circuitry determines whether the luma block is coded in intra block copy (IBC) mode based on a first IBC flag included in the prediction information. The processing circuitry determines whether the chroma block is coded in the IBC mode based on one of the first IBC flag, a second IBC flag included in the prediction information, and a default mode. The processing circuitry reconstructs the current coding unit based on the luma block and the chroma block.

Determining applicability of intra block copy in semi-decoupled partitioning

The implementations described herein include methods and systems for coding video. In one aspect, a method includes receiving a current frame including a current coding block. The current coding block has multiple subblocks. The subblocks are associated with different motion vectors, and include a first subblock located at a boundary of the current coding block. The method includes determining a motion vector of the current coding block, determining a first motion vector of the first subblock, and generating motion compensation data of the first subblock based on the motion vector and the first motion vector of the first subblock, e.g., by identifying a prediction block based on the motion vector of the current coding block, identifying a first prediction block based on the first motion vector of the first subblock, and combining the prediction block and the first prediction block to generate the motion compensation data of the first subblock.

Systems and methods for combining subblock motion compensation and overlapped block motion compensation

This disclosure relates generally to video coding and particularly to methods and systems for deriving context adaptive interpolation filter used for generating prediction samples in inter prediction involving a fractional motion vector or block vector. For example, an encoder and a decoder may derive interpolation filters adaptively using reconstructed samples. The reconstructed samples may belong to templates near a current block and a reference block related by the motion vector or block vector. The derivation of the adaptive interpolation filters may be based on minimizing distortions between interpolated templates associated with the reference block and the templates associated with the current block.

Context adaptive interpolation filter

Methods and apparatuses for performing chroma from luma (CfL) intra prediction, including: receiving a current chroma block from a coded bitstream; determining whether CfL intra prediction mode is enabled for the coded bitstream; determining a color format corresponding to the coded bitstream; based on determining that the CfL intra prediction mode is enabled, and based on the determined color format, obtaining, from the coded bitstream, a syntax element indicating a downsampling filter used for the CfL intra prediction mode; selecting the downsampling filter among a plurality of downsampling filters to be used for a chroma block in the CfL intra prediction mode; determining luma sample positions associated with the current chroma block based on the selected downsampling filter; downsampling a plurality of luma samples at the luma sample positions, wherein pixels in each downsampled luma sample are co-located with corresponding pixels in the current chroma block; and reconstructing the current chroma block based on at least the plurality of downsampled luma samples.

Signaling of downsampling filters for chroma from luma intra prediction mode

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. The processing circuitry receives coded information of a current block in a current picture from a coded video bitstream. The coded information includes a syntax element associated with the current block, the syntax element indicates a decoding parameter of the current block. The processing circuitry determines a context-based adaptive binary arithmetic coding (CABAC) context model associated with the syntax element based on at least a temporally co-located block of the current block. The temporally co-located block is in a different picture from the current picture. Further, the processing circuitry decodes the syntax element based on the CABAC context model, and reconstructs the current block based on the syntax element that is decoded based on the CABAC context model.

Context-based adaptive binary arithmetic coding (CABAC) context modeling with information from temporal neighbors

This disclosure generally describes a set of advanced video coding technologies, and is specifically related to cross-component sample offset (CCSO) filtering. For example, a CCSO filter having fractional CCSO filtering tap positions may be used to generate sample offsets from one color component of a reconstructed video. The sample offsets may then be applied to a second color component of the reconstructed video. The reconstructed samples of the first color component may first be interpolated by an interpolation filter in order to generate interpolated samples of the first color component at the fractional CCSO tap positions. The interpolated samples may be used as input to the CCSO filter for the generation of the sample offsets.

Cross component sample offset filtering with interpolated filter taps

This disclosure describes a set of advanced video coding technologies. More specifically, the disclosed technology involves cross-channel prediction and particularly chroma from luma (CfL) prediction. In some example implementations, a sample in a chroma channel is predicted based on a weighted sum or average of an alternate current prediction contribution derived based on reconstructed samples of a luma channel and a direct current prediction contribution generated based on an intra-prediction of the sample in the chroma channel based on reconstructed samples of the chroma channel, the intra-prediction being performed based on an intra-prediction mode other than a DC mode.

Cross-channel prediction based on multiple prediction modes

This disclosure relates generally to video coding/decoding and particularly for a transform dictionary. A method includes receiving the coded video bitstream; determining, based on the coded video bitstream, a transform pile for the current block, the transform pile being one transform pile in a transform dictionary, the transform dictionary comprising a plurality of transform piles, and the transform pile comprising a plurality of transform sets; determining a transform set in the transform pile; determining a transform kernel in the transform set; performing an inverse transform for the current block based on the transform kernel for obtaining a residual block for the current block; and reconstructing the current block based on the residual block.

Dictionary of transforms

This disclosure relates generally to video coding/decoding and particularly for providing extension to block adaptive weighted prediction (BAWP). One method includes receiving a coded video bitstream; determining, based on a syntax element signaled in the coded video bitstream, a prediction mode for predicting the current block based on a reference block, wherein the prediction mode comprises a linear equation; deriving a scaling factor for the current block, from at least one of the following: multiple scaling factors of neighboring blocks with respect to the current block, or a stored scaling factor bank; and reconstructing the current block based on the reference block and the identified scaling factor according to the linear equation.

Extension to block adaptive weighted prediction

Growing community of inventors

Sunnyvale, CA, United States of America

Liang Zhao