Tencent America LLC

Qualcomm Incorporated

Hefei Reliance Memory Limited

Lightwave Microsystems Corporation

Other

Neophotonics Corporation

Samsung Electronics Co., Ltd.

Lightwave Microsytstems Corporation

Fontecha, Ed

Quirke, David J.

Mcginnis, Brian

Seto, Sam

Long, Wilson

Ho, Calvin

Zhao, Liang

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

Guichun Li

Hong Sun Kim

Xiaozhong Xu

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

Dinesh Kumar Devineni

Jeffrey Wong

Chang Shik Row

Jane Lam

Zhigang Han

Yushin Cho

Stephan Wenger

Leonid Sheynblat

Douglas Neal Rowitch

Xiaoxin Zhang

Daniel Fred Filipovic

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

Prashanth Akula

Subramanya P Rao

Kevin Hsi Huai Wang

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

Biao Wang

Rishabh Raj

Shriram Gurumoorthy

Ravindra Chauhan

Brian P McGinnis

David James Quirke

Madhu Peringassery Krishna

A method and apparatus for selecting an intra interpolation filter for multi-line intra prediction based on a reference line index for decoding a video sequence includes identifying a set of reference lines associated with a coding unit. A first type of interpolation filter is applied to reference samples included in a first reference line, of the set of reference lines, that is adjacent to the coding unit to generate a first set of prediction samples based on the first reference line being associated with a first reference line index. A second type of interpolation filter is applied to reference samples included in a second reference line, of the set of reference lines, that is non-adjacent to the coding unit to generate a second set of prediction samples based on the second reference line being associated with a second reference line index.

Intra interpolation filter for multi-line intra prediction

A method for video decoding includes decoding prediction information that indicates a partition of the current block and indicates an index indicating a first intra prediction mode in a first set of intra prediction modes for a first partition of the current block. The method further includes, when the first partition has a non-square shape, remapping the first intra prediction mode to a second intra prediction mode based on an aspect ratio of the first partition. When the aspect ratio of the first partition is out of a specific range, a number of intra prediction modes in the first set of intra prediction modes that are replaced by wide-angle intra prediction modes is fixed to a pre-defined number. The method further includes decoding at least the first partition according to the first intra prediction mode or the second intra prediction mode.

Mapping wide angle modes to intra prediction modes for a partition of a coding block

The various implementations described herein include methods and systems for coding video. In one aspect, a video bitstream includes a current coding block of an image frame and includes a cross-component intra prediction mode. A computing system identifies a sample of the first color component and a sample of the second color component co-located with the sample of the first color component. At least two adjacent samples of the second color component are identified, and a location of each adjacent sample is identified by a horizontal delta coordinate value or a vertical delta coordinate value with respect to the sample of the second color component. The computing system generates the sample of the first color component based on the at least two adjacent samples of the second color component, and reconstructs the current coding block based at least on the generated sample of the first color component.

Multi-phase cross component prediction

A computing system receives a video bitstream comprising a current picture and a current block within the current picture. The current block is encoded using information from a first reference block and a second reference block. When a portion of the current block corresponds to a first area that is within reference boundaries in both of the first and second reference blocks, the system reconstructs the portion using an average of reference values from the first and second reference blocks. When the portion of the current block corresponds to (i) a second area that is not within the reference boundaries in both of the first and second reference blocks or (ii) a third area that is within the reference boundaries in only one of the first and second reference blocks, the system reconstructs the portion using a weighted average of respective values of the first and second reference blocks.

Implicit masked blending mode improvement

An example method of video decoding includes receiving a video bitstream that comprises a plurality of blocks including a current chroma block. When less than a threshold number of neighboring chroma blocks of a current chroma block use a chroma-from-luma (CfL) mode, a first context is selected as an entropy decoding context for a first flag. When at least the threshold number of neighboring chroma blocks use the CfL mode, a second context is selected as the entropy decoding context for the first flag. The method also includes entropy decoding the first flag from the video bitstream using the entropy decoding context, where the first flag indicates whether the CfL mode is enabled for the current chroma block, and decoding the current chroma block according to a value of the first flag.

Signaling method for chroma intra prediction mode

The various implementations described herein include methods and systems for encoding and decoding video. In one aspect, a method of video decoding includes receiving video data that includes a first block from a video bitstream, where the first block is predicted in an angular prediction mode. The method also includes identifying a set of reference samples for a portion of the first block using a prediction angle for the angular prediction mode and deriving a first angular prediction value for the portion using at least a first subset of the set of reference samples. The method further includes deriving a second angular prediction value for the portion using a weighted sum of at least a second subset of the set of reference samples and the first angular prediction value and decoding the portion using the second angular prediction value.

Systems and methods for angular intra mode coding

The various implementations described herein include methods and systems for coding video. In one aspect, a video bitstream includes distinct coding blocks of a current image frame and signals a cross-component intra prediction mode. A method includes for each distinct coding block, identifying a chroma component, a luma sample co-located with the chroma component, and neighboring luma samples of the luma sample. The method includes deriving a respective bias value based on a set of luma samples within a reference area of the respective coding block, which includes one or more coding blocks that are adjacent to, and decoded prior to, the respective coding block in the current image frame. The method further includes combining the luma sample, the neighboring luma samples, and the respective bias value to generate the chroma component and reconstructing the distinct coding blocks including the chroma component of each distinct coding block.

Bias value determination for chroma-for-luma (CfL) mode

Video processing devices and methods are disclosed to combine chroma blocks into a combined chroma block, determine neighbor luma samples of one or more luma blocks corresponding to the combined chroma block, average the reconstructed neighbor luma samples to generate a neighbor luma average, and perform a chroma from luma (CfL) prediction for the chroma blocks based on the neighbor luma average; and to compare a size of a chroma block with at least one size threshold and/or a transform unit (TU) depth of the chroma block with a TU depth of a corresponding luma block; determine a type of CfL prediction process for the chroma block based on the comparison; and perform a CfL prediction process for the chroma block according to the type of CfL prediction process.

Chroma from luma prediction based on merged chroma blocks

The various implementations described herein include methods and systems for coding video. In one aspect, a video bitstream includes a current coding block of an image frame and a syntax element for a cross-component intra prediction (CCIP) mode. The CCIP mode indicates whether each chroma sample of the current coding block is determined based on one or more luma samples. An electronic device generates a plurality of hypothesis values to be used in predicting a first chroma sample by combining a plurality of neighboring luma samples of a first luma sample that is co-located with the first chroma sample using a plurality of coefficients. The first chroma sample is predicted by combining the first luma sample and the plurality of hypothesis values based on a plurality of weighing factors. The electronic device reconstructs the current coding block including the first chroma sample.

Multi-hypothesis cross component prediction

Methods and apparatuses for performing cross-component intra prediction, including: receiving a coded bitstream; obtaining, from the coded bitstream, a syntax element indicating a downsampling filter used for a cross-component intra prediction mode; obtaining a plurality of reconstructed sample values of a first component which are associated with a pixel of a second component based on the downsampling filter; determining a pixel value of a downsampled pixel of the first component, based on the plurality of reconstructed sample values; determining a pixel value of the pixel of the second component based on the pixel value of the downsampled pixel of the first component; and reconstructing a picture based on the pixel value of the pixel of the second component.

Signaling of downsampling filters for chroma from luma intra prediction mode

Aspects of the disclosure provide method and apparatus for video coding. In some examples, an apparatus includes processing circuitry. The processing circuitry decodes prediction information of a first block from a coded video bitstream. The first block is a non-square block and the prediction information for the first block is indicative of a first intra prediction mode in a first set of intra prediction modes for a square block. Then, the processing circuitry remaps the first intra prediction mode to a second intra prediction mode in a second set of intra prediction modes that is used for the non-square block. The second set of intra prediction modes includes at least the second intra prediction mode that is not in the first set of intra prediction modes. Further, the processing circuitry reconstructs at least one sample of the first block according to the second intra prediction mode.

Wide-angle intra prediction for non-square blocks

A method, system, and non-transitory computer readable medium is provided for decoding video data. Video data comprising a chroma component having a first nominal angle and first delta angles and a luma component having a second nominal angle and second delta angles is received, wherein the first delta angles are dependent on the second delta angles. The first delta angle values corresponding to the first delta angles are parsed or derived based at least on second delta values corresponding to the second delta angles, wherein the first delta angle values are derived from one or more nominal angles associated with one or more sample positions corresponding to one or more luma blocks. A prediction mode associated with the chroma component based on a nominal mode of a corresponding luma block is entropy-coded. The video data is decoded based on the first delta angle values corresponding to the first delta angles.

Further improvement for chroma mode coding

Methods, apparatus, and computer readable storage medium for intra prediction mode coding in video decoding. The method includes receiving, by a device, a coded video bitstream for a block. The device includes a memory storing instructions and a processor in communication with the memory. The method also includes dividing, by the device, a list of intra modes into a plurality of intra mode sets for the block based on mode information of each intra mode in the list, the list of intra modes corresponding to an intra prediction mode of at least one neighboring block of the block; extracting, by the device from the coded video bitstream, a set index indicating an intra mode set from the plurality of intra mode sets; extracting, by the device from the coded video bitstream, a mode index indicating an intra prediction mode from the intra mode set; and determining, by the device, the intra prediction mode for the block based on the set index and the mode index.

Intra mode coding

This disclosure relates generally to video coding/decoding and particularly to motion vector prediction based on subblock motion vectors. One method is disclosed for processing a current block of a current frame in a coded video bitstream. The method includes receiving, by a device, a coded video bitstream; determining, by the device based on the coded video bitstream, the current block of the current frame to be inter predicted by at least one reference block of at least one reference frame; determining, by the device based on the coded video bitstream, a current-block motion vector (MV) corresponding to each of the at least one reference block, the current-block MV to be predicted by a reference MV; and identifying, by the device, a subblock MV of a MV reference block as the reference MV for predicting the current-block MV.

Method and apparatus for motion vector prediction based on subblock motion vector

This disclosure relates generally to video coding and particularly to smooth-sub-block motion compensation, disclosing methods and systems for determining subblock motion vectors of a video block based on motion information of its spatial neighboring block, temporal blocs spatially co-located with the neighboring blocks, or co-located temporal block of the video block.

Smooth sub-block motion vector prediction

Growing community of inventors

Sunnyvale, CA, United States of America

Liang Zhao