Sz Dji Technology Co., Ltd.

Huawei Technologies Co., Limited

Chinese Academy of Sciences

Beijing Bytedance Network Technology Co., Ltd.

Bytedance Inc.

Peking University

Mediatek Singapore Pte. Ltd.

Lemon Inc.

Bytedance (Hk) Limited

Siwei Ma

Xiaozhen Zheng

Shanshe Wang

Suhong Wang

Wen Gao

Weiran Li

Tianliang Fu

Yan Lu

Li Feng Zhang

Kai Zhang

Hongbin Liu

Yue Wang

Haitao Yang

Zhao Wang

Xiangyang Ji

Junru Li

Debin Zhao

Xuewei Meng

Tiejun Huang

Li Ni Zhang

Yu Wang

Ronggang Wang

Zhenyu Wang

Sixin Lin

Shan Gao

Wenmin Wang

Shengfu Dong

Zhuoyi Lv

Jiaqi Zhang

Yu Zhang

Yuwen He

Qiang Wang

Dong Wang

Lei Chen

Shaw-Min Lei

Lu Yu

Xin Zhao

Jicheng An

Yang Zhao

Meng Wang

Lei Zhang

Yun He

Yue Li

Mingyuan Yang

Shiqi Wang

Lianhuan Xiong

Qin Yu

Yun Jiang

Jinwen Zan

Chuanmin Jia

Junhao Zheng

Honggang Qi

Jian Lou

Yuhuai Zhang

Bo Teng

Jianhui Chang

Methods, systems and devices for sample string processing in intra coding are described. An example method of video processing includes determining, for a conversion between a video comprising a current block and a bitstream of the video, whether a first sample string of the current block forms a rectangle, and performing, based on the determining, the conversion, wherein the determining is based on a position and a length of the first sample string.

Sample string processing in intra coding

This application discloses an image processing method, device, system, electronic equipment, and storage medium, applied at the encoding end. The method includes extracting a one-dimensional feature vector from an original image block; transforming the original image block into a multidimensional feature map based on the one-dimensional feature vector; quantizing and encoding the one-dimensional feature vector to generate a first code stream; discretely encoding the multidimensional feature map to generate a second code stream, thereby efficiently compressing the spatial-independent vector and the multidimensional feature map; and sending the first and second code streams to the decoding end. Since the encoding stream comprises two layers each representing different types of image information, image reconstruction from the two-layer code streams maintains information integrity even at low bit rates, thus improving visual effects and experience.

Method, device, system, electronic device, and storage medium for image processing

Methods, systems and devices for video coding using sample string vectors are described. An example method of video processing includes determining, for a conversion between a video including a current block and a bitstream of the video, an availability of a block vector of one or more non-adjacent neighboring blocks of the current block for a prediction of a block vector of the current block according to a rule, and performing, based on the determining, the conversion, wherein the rule specifies a pre-defined order for checking the one or more non-adjacent neighboring blocks.

Video coding using sample string vector

A bitstreams generating method includes obtaining a historical motion information candidate list used for encoding each of a plurality of image blocks included in a region of a current frame, encoding the plurality of image blocks according to the historical motion information candidate list, and generating bitstreams including one or more indexes of motion information. The historical motion information candidate list is a history-based motion vector prediction (HMVP) candidate list. During the process of encoding all the plurality of image blocks included in the region, the historical motion information candidate list is not updated. Only the motion information of the last image block in the region is used to update the historical motion information candidate list after the encoding process of the last image block is finished.

Video processing method and device thereof

A video processing method includes performing a conversion between a video block of a video and a bitstream of the video according to a rule. The rule specifies whether or how usage of a secondary transform within a video unit is indicated in the bitstream. The secondary transform is applied before quantization or after de-quantization.

Coded video processing using enhanced secondary transform

An encoding method includes binarizing a chrominance prediction mode of an image block of an image that is permitted to use a CCLM and/or regular intra-frame chrominance prediction mode to obtain a bit string including adjacent bits. The CCLM includes first, second, and third modes, a second mode, and a third mode, the regular intra-frame chrominance prediction mode being other intra-frame chrominance prediction modes except CCLM. A first bit of the adjacent bits indicates whether CCLM is used according to whether a value there of is 1. A second bit indicates whether to use the first mode when the first bit indicates to use CCLM. A third bit indicates whether the second or third mode is used when the second bit indicates the first mode is not used. The method further includes using mutually independent probability models to respectively encode the first bit and the second bit.

Video image processing method and device, and storage medium

Methods, system and apparatus for video processing are described. One example video processing method includes determining, for a conversion between a current video block of a video and a bitstream of the video, a usage of an identity transform mode for the conversion of the current video block according to a rule. The rule specifies that the usage is based on representative coefficients of one or more representative blocks of the video. The method also includes performing the conversion based on the determining.

Implicit multiple transform set signaling in video coding

A video processing method includes obtaining motion information of a left neighboring block of a current image block, and, where the left neighboring block satisfies a condition, determining, in a collocated frame of the current image block, a related block of a sub-block of the current image block using a motion vector of the left neighboring block as a motion offset, and determining a motion vector of the sub-block according to a motion vector of the related block. The preset condition includes a reference image of the left neighboring block being same as the collocated frame of the current image block. Determining the motion vector of the sub-block includes, where reference images of the related block and the sub-block are not specific reference images, determining the motion vector of the sub-block according to a scaled motion vector obtained by scaling the motion vector of the related block.

Method and device for obtaining motion vector of video image

A video encoding method includes determining a base motion vector list that includes a dual-prediction base motion vector group including a first base motion vector and a second base motion vector, determining two motion vector offsets according to a preset offset set, determining motion vectors of a current image block according to the first base motion vector, the second base motion vector, and the two motion vector offsets, and performing prediction on the current image block according to the motion vectors of the current image block.

Method and device for video image processing

A video image processing method includes dividing a current image block into a plurality of sub-blocks, in response to a target neighboring block of the current image block satisfying a preset condition, determining related blocks of the sub-blocks in a collocated frame of the current image block according to a motion vector of the target neighboring block, encoding or decoding the current image block according to motion vectors of the related blocks of the sub-blocks, determining a group of control point motion vectors in an affine transformation mode using one or more neighboring blocks of the current image block, and adding the group of control point motion vectors to a motion vector candidate list of the current image block.

The present disclosure provides a loop filtering method which includes determining a clip index parameter of a loop filter, and encoding the clip index parameter by using a non-exponential Golomb encoding method.

Loop filtering method and device

A video image processing method including determining a current image block, constructing a motion information candidate list for the current image block, in response to a size of the current image block meeting a preset condition, turning off a temporal motion vector prediction (TMVP) operation so that a temporal candidate motion vector of the current image block is not determined according to the TMVP operation, and encoding the current image block. The TMVP operation includes determining a relevant block of the current image block in a temporal neighboring image, and determining the temporal candidate motion vector of the current image block according to a motion vector of the relevant block.

Video image processing method and device

A video encoding method includes encoding images of an image sequence to generate a bitstream of the image sequence. Different identifiers are used for two chrominance components of one image in a syntax element of an image level in the bitstream to indicate whether the corresponding chrominance components are filtered by adaptive loop filtering (ALF).

Method and device for video encoding and decoding and storage medium

An in-loop filtering method includes determining a target filter for a chrominance component of a current block of an image from a plurality of cross-component ALF filters, determining target filter coefficients for the chrominance component according to the chrominance component after ALF and a luminance component of the current block without ALF, filtering the chrominance component after ALF according to the target filter and the target filter coefficients, determining a filtered chrominance component of the current block according to the chrominance component after being filtered with the target filter coefficients and the chrominance component after the ALF, encoding according to the filtered chrominance component of the current block, and encoding a total number of the plurality of cross-component ALF filters as a syntax element. A stream of the image includes only one syntax element for indicating the total number of the plurality of cross-component ALF filters.

In-loop filtering method and device

A video encoding method including obtaining a motion vector candidate list of a current image block; determining a base motion vector according to motion vectors in the motion vector candidate list; in response to the base motion vector pointing to a short-term reference image, scaling a motion vector offset of the base motion vector using a scaling factor to obtain a scaled motion vector offset, and performing prediction for the current image block according to a motion vector determined by the scaled motion vector offset and the base motion vector; and in response to the base motion vector pointing to a long-term reference image, skipping scaling of the motion vector offset, and performing prediction for the current image block according to a motion vector determined by the motion vector offset that is not scaled and the base motion vector.

Growing community of inventors

Beijing, China

Siwei Ma