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

Marta Karczewicz

Xiang Li

Yixin Du

Han Gao

Jianle Chen

Xiaozhong Xu

Guichun Li

Li Feng Zhang

Jing Ye

Vadim Seregin

Lien-Fei Chen

Wei-Jung Chien

Amir Said

Ying Hai Chen

Sehoon Yea

Cheung Auyeung

Meng Xu

Kai Zhang

Hongbin Liu

Stephan Wenger

Vijayaraghavan Thirumalai

Byeongdoo Choi

Roman Chernyak

Xianglin Wang

Ling Li

Nan Hu

Samruddhi Yashwant Kahu

Biao Wang

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

Marc Joseph DeVincentis

Hsiao-Chiang Chuang

Woo-Shik Kim

Mahdi Farrokh Baroughi

Steven E Molesa

Paul Stephen Drzaic

Yu-Chen Sun

Li Zhang

In Suk Chong

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

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 for applying adaptive weightings on intra prediction and inter prediction parts in compound inter-intra prediction modes includes defining a template area of neighboring reconstruction or prediction samples, applying one or more adaptive weighting candidates to the template area to generate one or more prediction samples using compound inter-intra prediction, calculating a cost value for each of the one or more adaptive weighting candidates, selecting the adaptive weighting candidate that provides the lowest cost as the weighting used for decoding a block with compound inter-intra prediction mode, and decoding the block based on the selected adaptive weighting.

Compound inter-intra prediction modes

Aspects of the disclosure provide a method and an apparatus including processing circuitry for video decoding. The processing circuitry decodes coded information for a transform block (TB) from a coded video bitstream. The coded information indicates one of intra prediction mode information that indicates an intra prediction mode used for the TB, a size of the TB, and a primary transform type used for the TB. The processing circuitry determines a context for entropy decoding a secondary transform index based on the one of the intra prediction mode information for the TB, the size of the TB, and the primary transform type used for the TB. The secondary transform index indicates a secondary transform in a set of secondary transforms that is to be performed on the TB. The processing circuitry entropy decodes the secondary transform index based on the context and performs the secondary transform.

Entropy coding a secondary transform index based on primary transform type

This disclosure relates encoding and decoding of motion vector difference in for inter-predicting a video block. An example is disclosed for decoding an inter-predicted video block of a video stream. The method includes receiving a coded video bitstream; extracting, from the coded video bitstream, an inter-predication mode and a joint delta motion vector (MV) for a current block in a current frame; extracting, from the coded video bitstream, a flag indicating whether a first delta MV for a first reference frame and a second delta MV for a second reference frame are jointly signaled; in response to the flag indicating that the first delta MV and the second delta MV are jointly signaled, deriving the first delta MV and the second delta MV based on the joint delta MV; and decoding the current block in the current frame based on the first delta MV and the second delta MV.

Joint motion vector difference coding

A decoding device is provided for decoding of a bitstream, and more specifically for predicting a picture area of an input image for decoding. The picture area has been divided into at least first and second parts by a partitioning boundary, and the pixels of each part are predicted according to suitable measures. Blending masks are then applied to generate blended regions for the predicted pixels, modifying the pixels to generate a complete prediction of the picture area based on both parts. The blending mask is based on first and second thresholds, which are defined relative to the partitioning boundary, and which may have different values to produce an asymmetrical blending relative to the boundary. Based on suitable threshold values, the prediction, combination, and decoding of the picture area is more adaptive to differing contents of the parts therein.

Method and apparatus for asymmetric blending of predictions of partitioned pictures

This disclosure relates generally to video coding/decoding and particularly for evaluating codec performance. One method includes obtaining a first plurality of anchor data points; obtaining a second plurality of test data points; analyzing monotonicity conditions of the first plurality of anchor data points and the second plurality of test data points; determining a fitting algorithm based on the analyzed monotonicity conditions; fitting the first plurality of anchor data points with the fitting algorithm to obtain an anchor curve; fitting the second plurality of test data points with the fitting algorithm to obtain a test curve; and evaluating the test codec performance based on the anchor curve and the test curve, to obtain an evaluation result.

Methods and devices for video codec performance measurement and evaluation

A video bitstream is received. The video bitstream includes a current block comprising a plurality of subblocks and a template region of the current block comprising a plurality of template subblocks adjacent to at least one of a top side and a left side of the current block. A motion vector (MV) located in a center position of the current block is determined. The MV is determined based on at least one MV of the plurality of subblocks of the current block. A MV for each of the plurality of template subblocks is determined based on the MV located in the center position of the current block and a respective MV of a corresponding subblock of the plurality of subblocks that is adjacent to the respective template subblock. The current block is reconstructed based on the determined MVs for the plurality of template subblocks.

Motion vector derivation of subblock-based template-matching for subblock based motion vector predictor

This disclosure relates generally to video coding and particularly to cross component level reconstruction. For example, a method is disclosed for processing video data which may include encoding a video block comprising a first transform block of a first color component and a second transform block of a second color component, wherein the first transform block and the second transform blocks are co-located blocks; encoding a first syntax element to signal whether a CCLR is applied to the first transform block, wherein, when CCLR is applied to the first transform block, a refinement process is required to be applied to the first transform block to obtain a refined first transform block on which an inverse transform is to be performed; and transmitting a bitstream comprising the video block and the first syntax element.

Primary transforms for cross-component level reconstruction

Systems and methods for encoding and decoding using syntax design for multi-symbol arithmetic coding are provided. A method includes receiving a coded video bitstream including a plurality of syntax elements; determining a first maximum alphabet size for arithmetic coding by an arithmetic coding engine, the first maximum alphabet size determined based on a hardware constraint; determining a second maximum alphabet size that is less than the first maximum alphabet size; and decoding the plurality of syntax elements included in the coded video bitstream, based on the determined second maximum alphabet size, wherein each of the plurality of syntax elements is entropy coded with an alphabet size less than or equal to the determined second maximum alphabet size.

Systems and methods including syntax design for multi-symbol arithmetic coding

In a method for video decoding in a decoder, transform coefficients associated with a coding block that is an L-shaped partition of a picture are decoded, by a processor and from a coded video bitstream. The L-shaped partition of the picture is partitioned into a plurality of rectangular sub-blocks when the coding block is the L-shaped partition, each corner of the L-shaped partition being a right angle. Residuals of each of the plurality of rectangular sub-blocks in the coding block are determined, by the processor, based on the transform coefficients of the respective rectangular sub-block. Samples of the coding block are reconstructed, by the processor, based on the residuals of the coding block.

Transform for L-shaped partition

The various implementations described herein include methods and systems for coding video. In one aspect, a method includes receiving a video bitstream that includes encoded video data and one or more syntax elements indicating one or more clipping ranges. The method includes deriving, based on the one or more syntax elements, the one or more clipping ranges for a portion of the encoded video data. Each of the one or more clipping ranges modifies a range of sample values of the received video bitstream. The method includes performing one or more clipping operations on the encoded video data using the derived one or more clipping ranges.

Adaptive range for clipping processes for video and image compression

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 extracts, from a bitstream, a signal indicative of an application of a template matching based block vector refinement for coding a current block in a current picture referencing (CPR) mode. The processing circuitry derives a first refined block vector associated with the current block according to the template matching based block vector refinement. The first refined block vector includes a first block vector refinement offset applied on a first block vector associated with the current block. The processing circuitry reconstructs the current block according to a first reference block in a same picture as the current block, the first reference block being indicated by the first refined block vector.

Block vector refinement method for intra block copy

The disclosure includes methods and apparatuses that includes processing circuitry that derives a chroma prediction mode of a chroma block in a chroma coding region based on luma coding information of a luma block associated with a position in a reconstructed luma area that is collocated with the chroma block. The chroma coding region is partitioned separately from a collocated luma coding region including the reconstructed luma area. The luma coding information indicates that the luma block is coded with a first coding mode using a first luma BV (an IBC mode or an IntraTMP mode) and a second coding mode. The processing circuitry derives a chroma BV of the chroma block based on a luma BV of the luma block and reconstructs the chroma block based on the chroma prediction mode including the first coding mode and the second coding mode.

Chroma block vector and chroma coding mode derivation

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. For example, the processing circuitry decodes prediction information of a current block from a coded video bitstream. The prediction information indicates that a prediction of the current block is at least partially based on an inter prediction. Then, the processing circuitry reconstructs at least a sample of the current block as a combination of a result from the inter prediction and neighboring samples of the block that are selected based on a position of the sample.

Method and apparatus for video coding

The various implementations described herein include methods and systems for coding video. In one aspect, a method includes receiving video data including a picture, wherein the picture is coded using at least a first color component and a second color component, and the picture includes a first block that is coded in a geometric partition mode, the first block including a first geometric partition and a second geometric partition; reconstructing samples in a first geometric partition of the first color component of the first block; deriving samples in the first geometric partition of the second color component of the first block based on the reconstructed samples of the first color component of the first block; and decoding the first block in the picture based at least on the reconstructed samples in the first geometric partition of the first color component and the second color component of the first block.

Systems and methods for cross-component geometric/wedgelet partition derivation

An example method of video coding includes receiving a video bitstream including a plurality of coding blocks; identifying, based on a first indicator in the video bitstream, a coding region that comprises two or more blocks of the plurality of coding blocks, where at least one block in the coding region is encoded in an intra prediction mode and at least one block in the coding region is encoded in a non-intra prediction mode. For a last block in the coding region, when all preceding blocks in the coding region are encoded in the intra prediction mode, the method includes inferring a prediction mode of the last block as being an inter prediction mode without receiving an inter prediction mode indicator for the last block; and reconstructing the last block using the inferred prediction mode.

Systems and methods for implicit derivation in a recursive intra region

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San Diego, CA, United States of America

Xin Zhao