Beijing Dajia Internet Information Technology Co., Ltd.

Qualcomm Incorporated

Nokia Corporation

Xianglin Wang

Marta Karczewicz

Yi-Wen Chen

Xiaoyu Xiu

Tsung-Chuan Ma

Bing Yu

Wei-Jung Chien

In Suk Chong

Liwei Guo

Hong-Jheng Jhu

Vadim Seregin

Wei Chen

Che-Wei Kuo

Shuiming Ye

Geert Van Der Auwera

Yunfei Zheng

Peisong Chen

Chengjie Tu

Muhammed Zeyd Coban

Cheng-Teh Hsieh

Jianle Chen

Joel Sole Rojals

Justin Ridge

Rajan Laxman Joshi

Yang Yu

Jaehong Chon

Xin Zhao

Ying Hai Chen

Ye-Kui Wang

Guoxin Jin

Woo-Shik Kim

Sungwon Lee

Yucong Chen

Yue Huang

Yiliang Bao

Xing Wen

Shufei Fan

Li Feng Zhang

Hongbin Liu

Miska Matias Hannuksela

Hsiao-Chiang Chuang

Kai Wang

Sanjeev Kumar

Prasanjit Panda

Shu Xiao

Hariharan Ganesh Lalgudi

Siping Tao

Mayank Tiwari

Shashidhar Jangili

Ning Yan

Yun-fei Zheng

Ying Chen

A method for video coding is provided, including: providing a motion vector (MV) rounding process that is configured to perform a MV rounding operation; applying the MV rounding process to at least a first MV used in a first prediction tool selected from a first set of tools including: pair-wise merge candidate, triangle prediction mode, and affine mode; and applying the MV rounding process to at least a second MV used in a second prediction tool selected from a second set of tools including: temporal motion vector prediction (TMVP), alternative temporal motion vector prediction (ATMVP), and merge mode with motion vector differences (MMVD).

Methods and apparatus of motion vector rounding, clipping and storage for inter prediction

A method for video encoding is provided. The method includes obtaining, by an encoder, a plurality of blocks from a video picture, wherein each of the plurality of blocks is to be encoded by an intra prediction mode or an inter prediction mode; in response to a first pre-defined condition being satisfied, determining, by the encoder, that a current block in the plurality of blocks is eligible for an application of Decoder-side Motion Vector Refinement (DMVR); in response to the current block being eligible for both applications of DMVR and Bi-Directional Optical Flow (BDOF), determining, by the encoder, whether a pre-defined criterion based on mode information of the current block is satisfied; avoiding, by the encoder in response to the pre-defined criterion being satisfied, applying BDOF to a subblock in the current block; and outputting, by the encoder by a bitstream, prediction mode information of the current block.

Methods and devices for selectively applying bi-directional optical flow and decoder-side motion vector refinement for video coding

A computing device performs a method of decoding video data by reconstructing a luma block corresponding to a chroma block; searching a sub-group of a plurality of reconstructed neighboring luma samples in a predefined order to identify a maximum luma sample and a minimum luma sample; computing a down-sampled maximum luma sample corresponding to the maximum luma sample; computing a down-sampled minimum luma sample corresponding to the minimum luma sample; generating a linear model using the down-sampled maximum luma sample, the down-sampled minimum luma sample, the first reconstructed chroma sample, and the second reconstructed chroma sample; computing down-sampled luma samples from luma samples of the reconstructed luma block, wherein each down-sampled luma sample corresponds to a chroma sample of the chroma block; and predicting chroma samples of the chroma block by applying the liner model to the corresponding down-sampled luma samples.

Simplifications of cross-component linear model

An electronic apparatus performs a method of decoding video data, comprising: receiving, from the video signal, a picture frame including a first component, and a second component; determining a classifier for the first component based on a first set of one or more samples of the second component associated with a respective sample of the first component and a second set of one or more samples of the first component associated with the respective sample of the first component; determining a sample offset for the respective sample of the first component according to the classifier; and modifying a value of the respective sample of the first component based on the determined sample offset. In some embodiments, the first component is a luma component and the second component is a chroma component, and the classifier is determined by a combination of a band offset classifier and edge offset classifier.

Coding enhancement in cross-component sample adaptive offset

The present disclosure relates to a method for deriving constructed affine merge candidates. The method includes acquiring one or more control point sets from a decoder. The decoder determines whether a reference index of each control point for the control point set index within the control point set associated with a reference index pointing into a reference picture in a first reference picture list is greater than or equal to zero and each is equal to each other. The decoder also determines whether a reference index of each control point for the control point set index within the control point set associated with a reference index pointing into a reference picture in a second reference picture list is greater than or equal to zero and each is equal to each other. The decoder determines that an affine motion model is available based on the determination result.

Method for deriving constructed affine merge candidates

Methods and devices for video encoding are provided. In the method, the device determines, for a current luma transform block in a coding unit, whether an intra subpartition (ISP) split type is an ISP mode. In response to determining that the intra subpartition split type is not the ISP mode, the device determines a first context index for a Coded Block Flag (CBF) flag of the current luma transform block as being equal to zero or one, where the CBF flag specifies whether the current luma transform block comprises one or more transform coefficient levels not equal to zero. In response to determining that the intra subpartition split type is the ISP mode, the device determines the first context index based on whether a current transform unit is a first one to be parsed in the coding unit. The device encodes the CBF flag based on the first context index.

Coding of transform coefficients in video coding

Methods and devices for video encoding are provided. In the method, the device divides a current picture into one or more coding units; determines, for a current luma transform block in a current coding unit of the one or more coding units, whether a first variable indicating an intra subpartition (ISP) split type equals ISP_NO_SPLIT. In response to determining the first variable equals ISP_NO_SPLIT, the device determines a luma block flag context index for a luma block flag of the current luma transform block as being equal to zero or one without determining whether the current luma transform block is smaller than the current coding unit. In response to determining the first variable does not equal ISP_NO_SPLIT, the device determines the luma block flag context index based on a second variable of a previous luma transform unit in the current coding unit.

Methods and devices for video coding are provided. In the method, the device determines, for a current luma transform block in a coding unit, whether an intra subpartition (ISP) split type is an ISP mode. In response to determining that the intra subpartition split type is not the ISP mode, the device determines a first context index for a Coded Block Flag (CBF) flag of the current luma transform block as being equal to zero or one, where the CBF flag specifies whether the current luma transform block comprises one or more transform coefficient levels not equal to zero. In response to determining that the intra subpartition split type is the ISP mode, the device determines the first context index based on whether a current transform unit is a first one to be parsed in the coding unit. The device decodes the CBF flag based on the first context index.

Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for video decoding. The method includes: constructing, by a decoder, a first merge list comprising a plurality of candidates, based on a merge list construction process for regular merge prediction, wherein each one of the plurality of candidates is a motion vector comprising a List 0 motion vector, or a List 1 motion vector, or both; receiving, by the decoder, a first/second index value to indicate a first/second candidate that is chosen from the first merge list; receiving, by the decoder, a first/second binary flag that is coded using a first/second context-adaptive binary arithmetic coding (CABAC) context modeling method to indicate whether a List 0 motion vector of the first/second candidate or a List 1 motion vector of the first/second candidate is selected for a first PU of the geometric prediction.

Methods and apparatuses for video coding with triangle prediction

A method for video decoding is provided. The method may be applied in a decoder and includes: receiving a video bitstream comprising a quantization parameter and a quantized level; deriving a scale value by scaling the quantization parameter by a scale factor; determining a plurality of parameters associated with a coding unit (CU); obtaining a plurality of bit-shifts by bit-shifting the plurality of parameters; and obtaining a plurality of coefficients associated with the CU based on the quantized level, the scale value, and the plurality of bit-shifts.

Methods and devices for quantization and de-quantization design in video coding

A method for video encoding is provided. The method may be applied in an encoder and includes: determining, for a first coding block, a quantization parameter and a quantized level; deriving a scale value by scaling the quantization parameter by a scale factor; determining a plurality of parameters associated with a coding unit (CU); obtaining a plurality of bit-shifts by bit-shifting the plurality of parameters; and obtaining a plurality of coefficients associated with the CU based on the quantized level, the scale value, and the plurality of bit-shifts.

A method for video encoding is provided. The method may be applied in an encoder and includes: determining, for a first coding block, a quantization parameter and a quantized level; deriving a scale value by scaling the quantization parameter by a scale factor, determining a plurality of parameters associated with a coding unit (CU); obtaining a plurality of bit-shifts by bit-shifting the plurality of parameters; and obtaining a plurality of coefficients associated with the CU based on the quantized level, the scale value, and the plurality of bit-shifts.

The present disclosure relates to a method for video encoding including: signaling a regular merge flag for a coding unit (CU) that is coded as merge mode and merge related modes; when the regular merge flag is signaled as one, indicating that a regular merge mode or merge mode with motion vector differences (MMVD) is used by the CU, constructing a motion vector merge list for the CU and using regular merge index to indicate which candidate is used; and when the regular merge flag is signaled as zero, indicating the regular merge mode is not used by the CU, and further signaling mode flags to indicate associated merge related modes are used when a mode flag's constraints are met; and when the regular merge flag is signaled as one, determining whether a MMVD merge flag is signaled based on the value of a MMVD flag.

System and method for signaling of motion merge modes in video coding

Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for encoding video. An encoder may obtain a first motion vector (MV) associated with a video block obtained from the video. The encoder may obtain a first prediction signal of the video block using the first MV. The encoder may identify a target MV by applying a gradient-based motion refinement algorithm in a recursive manner using the first prediction signal and the first MV. The encoder may obtain a second prediction signal of the video block based on the target MV.

Enhanced motion estimation for inter coding

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San Diego, CA, United States of America

Xianglin Wang