Tencent America LLC

Qualcomm Incorporated

Google Inc.

Tableau Software, Inc.

Apple Inc.

Trimble Inc.

Xin Zhao

Shan Liu

Liang Zhao

Xiang Yang Li

Madhu Peringassery Krishnan

Xiang Li

Marta Karczewicz

Yixin Du

Han Gao

Jianle Chen

Xiaozhong Xu

Guichun Li

Jing Ye

Li Feng Zhang

Vadim Seregin

Lien-Fei Chen

Wei-Jung Chien

Amir Said

Ying Hai Chen

Sehoon Yea

Cheung Auyeung

Meng Xu

Kai Zhang

Roman Chernyak

Hongbin Liu

Stephan Wenger

Vijayaraghavan Thirumalai

Biao Wang

Byeongdoo Choi

Samruddhi Yashwant Kahu

Xianglin Wang

Ling Li

Nan Hu

Yi-Wen Chen

Madhu Peringassery Krishna

Yushin Cho

Rajan Laxman Joshi

Hopil Bae

Paolo Sacchetto

Vidya Raghavan Setlur

Abbas Jamshidi Roudbari

Warren S Rieutort-Louis

Sunggu Kang

In Suk Chong

Marc Joseph DeVincentis

Hsiao-Chiang Chuang

Woo-Shik Kim

Mahdi Farrokh Baroughi

Steven E Molesa

Ding Ding

Alex Djalali

Chengjie Tu

Jaehong Chon

Jeffrey Ericson

Suyang Duan

Theodore Kornish

Tiffany T Moy

Francois R Jacob

Sandeep Chalasani

Zuoqian Wang

Eliana Leite Goldner

Sanaz Golbabaei

An Shi

Christoph Sachse

Lien-fei Chen

Jonathan P Mar

Ian D Tracy

Jui-Chih Liao

Tianqi Liu

Paul Stephen Drzaic

Yu-Chen Sun

Cheng-Teh Hsieh

Hilmi Enes Egilmez

Feng Zou

Sungwon Lee

Zhen Zhang

Niels Provos

Izhar Zahoor Ahmed

James Gerard Quaderer

Jaein Choi

Paul S Drzaic

Yong Sun

Anshi Liang

Guoxin Jin

Xiang Wang

Elmar Gehlen

Han-Chieh Chang

Izhar Z Ahmed

Aubrey Jason Calder

Moheeb Abu Rajab

Ying Chen

Pang Chao

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 image frame having a current coding block and signals a first syntax element for a residual template cross-component residual model (RT-CCRM) mode. When the RT-CCRM mode is enabled, the computing system identifies, in the current coding block, a first chroma sample and one or more luma samples corresponding to the first chroma sample, determines one or more residuals of the one or more luma samples in the current coding block, and applies a residual filter corresponding to the RT-CCRM mode to generate a first residual of the first chroma sample based on the residuals of the one or more luma samples. The computing system reconstructs the current image frame by compensating a predicted chroma sample with at least the first residual to reconstruct the first chroma sample.

Cross-component residual prediction by using residual template

A method, computer program, and computer system is provided for coding video data. Video data is received. One or more transform cores corresponding to a transform associated with the video data are identified. The one or more transform cores include one or more of a line graph transform (LGT) and a discrete sine transform (DST) The video data is decoded based on the identified transform core. The transform cores correspond to one or more from among an 8-bit transform core and a 10-bit transform core. The transform corresponds to one or more from among a 2-point transform, a 4-point transform, an 8-point transform, and a 16-point transform.

Line graph transforms (LGTs) using 8-bit and 10-bit cores

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

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 a coded video bitstream including a current picture. The current picture includes a current block. The processing circuitry determines, based on decoded information from the coded video bitstream, that the current block in the current picture is coded in an affine bi-prediction mode. The current block is predicted by a plurality of control point motion vectors. The processing circuitry refines the plurality of control point motion vectors by applying bilateral matching motion refinement, and reconstructs the current block according to the refined plurality of control point motion vectors associated with the current block.

Method for affine motion refinement

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

The various implementations described herein include methods and systems for coding video. In one aspect, a method includes receiving video data comprising a current block, where the current block has a size of N×M pixels, N and M being positive integers. The method includes generating a prediction block larger than the current block for the current block, where the prediction block has a size of (N+W)×(M+W) pixels, W being a positive integer; and the method includes determining a window error for a sample window of a sample of the current block using the generated prediction block.

Systems and methods for window error estimation improvement in temporal filter

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

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San Diego, CA, United States of America

Xin Zhao