Qualcomm Incorporated

Other

Shumaker & Sieffert, P.a.

Vadim Seregin

Marta Karczewicz

Wei-Jung Chien

Muhammed Zeyd Coban

Han Huang

Nan Hu

Rajan Laxman Joshi

Jianle Chen

Amir Said

Hilmi Enes Egilmez

Xin Zhao

Wei Pu

Joel Sole Rojals

Chun-Chi Chen

Adarsh Krishnan Ramasubramonian

Yao-Jen Chang

Krishnakanth Rapaka

Cheng-Teh Hsieh

Xianglin Wang

Feng Zou

Li Feng Zhang

Xiang Yang Li

Zhi Zhang

Ye-Kui Wang

Ying Hai Chen

Yong He

Geert Van Der Auwera

Yan Zhang

Luong Pham Van

Hongtao Wang

Chao Pang

Bappaditya Ray

Vijayaraghavan Thirumalai

Yung-Hsuan Chao

Kevin Pascal Andre Reuze

Hsiao-Chiang Chuang

Yu Han

Yi-Wen Chen

Dmytro Rusanovskyy

Liwei Guo

Yu-Chen Sun

Sungwon Lee

Alican Nalci

Keming Cao

Chengjie Tu

Jie Dong

Akshay Gadde

Fnu Hendry

In Suk Chong

Louis Joseph Kerofsky

Kai Wang

Jingya Li

Kai Zhang

Xiang Li

Anand Meher Kotra

Yunfei Zheng

Sanjeev Kumar

Po-Han Lin

Shu Xiao

Venkata Meher Satchit Anand Kotra

Nikolay Mikhaylovich Shlyakhov

An example device for coding video data includes memory configured to store the video data and one or more processors communicatively coupled to the memory. The one or more processors are configured to reduce a bit length of one or more input variables for a linear regression operation to generate one or more reduced bit length input variables, the input variables including at least one of a) one or more delta coordinates, b) one or more delta motion vectors, or c) a value representing a number of subblocks. The one or more processors are configured to perform the linear regression operation and derive an affine motion model based on the performing the linear regression on the one or more reduced bit length input variables. The one or more processors are configured to code a current block of the video data based on the affine motion model.

Bit-length control for linear regression-based affine merge candidate derivation

A method of encoding or decoding video data includes constructing a list of chroma intra-prediction modes for a chroma block of a current block of the video data, wherein constructing includes adding intra-prediction modes of a first group to the list of chroma intra-prediction modes, the first group comprising two or more intra-prediction modes derived from intra-prediction modes of two or more co-located luma blocks of the current block that are co-located with the chroma block; determining an intra-prediction mode for the chroma block from the list of chroma intra-prediction modes; and encoding or decoding the chroma block based on the intra-prediction mode.

Intra chroma mode list construction for video coding

A video coder is configured to construct a merge candidate list of merge candidates, wherein the merge candidate list has N1 candidates, N1 being a positive integer value, reorder the merge candidates in the merge candidate list to create a reordered merge candidate list, reduce the reordered merge candidate list to create an output merge candidate list, wherein the output merge candidate list has N2 candidates, wherein N2 is less than N1, and code a block of video data using the output merge candidate list.

Merge candidate reordering in video coding

A method for coding a block of video data using affine mode includes determining a refined affine model for the current block of video data from a linear regression process using a base motion vector field and a guidance motion vector field as inputs to the linear regression process. The method further includes determining affine merge candidates for the current block using the refined affine model, and coding the current block of video data using the affine merge candidates.

Derivation of affine merge candidates with linear regression for video coding

A video coder may code a sign prediction syntax element that indicates whether a sign prediction hypothesis is correct for a transform coefficient. The video coder may code the sign prediction syntax element using a context-based coding process. The video coder may determine a context for coding the sign prediction syntax element based on a position of the transform coefficient in the block of video data. The context may be further based on a coding mode used to code the block.

Context modeling for sign prediction for video coding

A device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine that a boundary block of a picture of the video data is bi-directional inter-predicted using a first motion vector and a second motion vector, the boundary block having an edge that touches an edge of the picture; decode the picture, including decoding the boundary block; form a first intermediate padding block using the first motion vector; form a second intermediate padding block using the second motion vector; form a padding block using the first intermediate padding block and the second intermediate padding block; and assign padding values of the padding block to a padding region of the picture neighboring the boundary block on an opposite side of the edge of the picture.

Bi-directional prediction boundary pixel padding with out-of-picture-boundary motion vectors

A video coder may adaptively determine whether to apply an inter-MTS (multiple transform set) mode to video data. The video coder may adaptively determine one or more of a maximum block size or a minimum block size for applying an inter-MTS mode. The video decoder may determine whether the inter-MTS mode is enabled for a block of video data based on a size of the block compared to one or more of the minimum block size or the maximum block size. and code the block using the inter-MTS mode based on the inter-MTS mode being enabled. Coding the block using the inter-MTS mode includes applying one or more transforms of a plurality of transforms to transform coefficients associated with the block of video data.

Flexible activation of multiple transform selection for inter-coding in video coding

A video coder is configured to determine a reference block of a reference picture for prediction of a current block of a current picture using motion information and to generate a set of reference samples for the current block of the current picture. To generate the set of reference samples, the video coder is configured to perform reference sample clipping on the reference block of the reference picture based on a size of the reference picture. The video coder is further configured to generate a prediction block for the current block of the current picture based on the set of reference samples.

Motion compensation using size of reference picture

A device for decoding video data determines a pre-filtered reconstructed block of video data; applies one or more of a deblocking filter or a sample adaptive offset filter to the pre-filtered reconstructed block to determine a filtered reconstructed block; applies an adaptive loop filter (ALF) to the filtered reconstructed block to determine a final filtered reconstructed block, wherein to apply the ALF to the filtered reconstructed block, the device is further configured to determine a difference value based on a difference between a value of a current sample of the filtered reconstructed block and a value of a pre-filtered neighboring sample; apply a filter to the difference value to determine a sample modification value; and determine a final filtered sample value based on the sample modification value.

Adaptive loop filter with samples before deblocking filter and samples before sample adaptive offsets

A method of coding video data comprises determining, based on a comparison of a threshold and a quantity of reference samples in a selected template, whether the selected template is allowed, wherein a mode index indicates which template from among a plurality of templates is the selected template, wherein each of the templates includes a different set of reconstructed samples that neighbor a current coding unit (CU) of a current picture of the video data; based on determining that the selected template is allowed and that a convolutional cross-component model (CCCM) mode is to be used, applying the CCCM mode to predict chroma samples of the current CU based on reconstructed luma samples of the current CU and the reference samples in the selected template; and; and encoding or decoding the current CU based on the predicted chroma samples of the current CU.

Template selection for intra prediction in video coding

A video decoder may be configured to generate a first ordering of reference pictures in a reference picture list for a first block of a slice, wherein generating the first ordering of the reference pictures for the first block comprises assigning indexes to the reference pictures; and generate a second ordering of the reference pictures in the reference picture list for a second block of the slice based on an adaptive reference picture reordering process, wherein the first ordering is different than the second ordering and generating the second ordering of reference pictures for the second block comprises assigning at least some of the indexes to different reference pictures than in the first ordering; decode the first block using the first ordering of the reference pictures; and decode the second block using the second ordering of the reference pictures.

Block level reference pictures adaptation for video coding

A video decoder may be configured to determine a motion vector and a motion vector precision for a current block; identify a current block template within the current picture; search within a search area for a final reference block template that corresponds to the current block template, wherein to search within the search area, the one or more processors are further configured to: identify an initial reference block template based on the motion vector, search other reference block templates around the initial reference block template using a step size that is set to an initial step size, and iteratively reduce the step size from the initial step size until the step size is set to a final step size that equals the motion vector precision; determine a prediction block for the current block based on the final reference block template.

Template matching in video coding

A method of encoding or decoding video data includes determining that a block vector difference (BVD) value is non-zero, wherein the BVD value is indicative of a difference between a block vector for a current block of the video data and a block vector predictor, and wherein the block vector points to a reference block based on samples in a same picture as the current block; and encoding or decoding a value for the BVD value, without signaling or parsing syntax information indicating whether an absolute value of the BVD value is greater than one.

Block vector difference binarization and coding in video coding

An example device for decoding video data includes one or more processors configured to determine merge mode information for a current block, the merge mode information indicating that motion information for a current block is to be predicted using a first predictor motion vector and a second predictor motion vector; determine a first motion vector difference (MVD) for the first predictor motion vector and a second MVD for the second predictor motion vector, the second MVD being different than the first MVD; form a first motion vector equaling a combination of the first motion vector predictor and the first MVD; form a second motion vector equaling a combination of the second motion vector predictor and the second MVD; generate a prediction block using the first motion vector and the second motion vector; and decode the current block using the prediction block.

MMVD merge mode with asymmetric motion vector difference

A video decoder can be configured to determine that a current block of the video data is coded in a bi-prediction inter mode; receive a first syntax element identifying a motion vector predictor from a first candidate list of motion vector predictors; receive a second syntax element identifying a motion vector difference; determine a first motion vector for the current block based on the motion vector predictor and the motion vector difference; determine a second motion vector for the current block from a second list of candidate motion vector predictors based on bilateral matching; and determine a prediction block for the current block using the first motion vector and the second motion vector.

Hybrid inter bi-prediction in video coding

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San Diego, CA, United States of America

Vadim Seregin