Alibaba Group Holding Limited

Alibaba Singapore Holding Private Limited

Alibaba Group Holding Limtted

Mohammed Golam Sarwer

Yan Ye

Jiancong Luo

Ru-Ling Liao

Jie Chen

Xuan Huang

Xinwei Li

The present disclosure provides systems and methods for processing video content. The method can include: receiving a bitstream comprising video content; determining whether a first signal associated with the video content satisfies a given condition; and in response to the determination that the first signal satisfies the given condition, disabling both a cross component adaptive loop filter (CCALF) process and a chroma adaptive loop filter (ALF) process.

Method and apparatus for processing video content with ALF and CCALF

The present disclosure provides systems and methods for signaling a maximum transform size and a residual coding method. According to certain disclosed embodiments, the methods include: receiving a bitstream comprising a set of pictures, determining, according to the received bitstream, a value of a coded tree block size; and determining, based on the value of the coded tree block size, whether to signal a flag indicating a maximum transform size for luma samples.

Signaling of maximum transform size and residual coding method

Methods and apparatuses for video encoding, comprising: receiving a video sequence; encoding the video sequence by using control flags for luma mapping with chroma scaling (LMCS) at a sequence level, a picture level, or a slice level, wherein the sequence level, the picture level, and the slice level are levels ranking from high to low; signaling a first control flag indicating whether the LMCS is enabled at a first level; and in response to the first control flag indicating the LMCS is enabled at the first level, signaling a second control flag indicating whether LMCS is enabled at a second level, wherein: the LMCS is enabled at the second level when a value of the second control flag equals to 1; the LMCS is disabled at the second level when the value of the second control flag equals to 0; and the second level is a lower level than the first level.

High level syntax control of loop filter

In a method of encoding a video sequence into a bitstream, an encoder determines, based on a value of a first encoded flag, whether to encode a second flag into the bitstream. The first flag indicates whether sign data hiding is turned off at a slice level for a video frame. The second flag indicates whether transform skip residual coding is turned off at the slice level for the video frame.

Sign data hiding of video recording

The present disclosure provides systems and methods for processing video content using motion compensation interpolation. The methods include: encoding or decoding a picture block by applying one or more filters to a reference picture, wherein the applying of the one or more filters generates a sample at a fractional sample position, and wherein the one or more filters comprise an 8-tap filter that has a plurality of coefficients [p0, p1, . . . , p7] for each 1/16 fractional sample position p.

Filters for motion compensation interpolation with reference down-sampling

A directional cross component filter may be used in a video decoding method. The video decoding method includes: determining a direction of a reconstructed luma block; decoding an encoded bit stream to determine a plurality of filter coefficients associated with a directional cross component filter; and applying the plurality of filter coefficients to the reconstructed luma block to determine an offset to the direction of the reconstructed luma block.

Directional cross component filter for video coding

The present disclosure provides a computer-implemented method for encoding video. The method includes: receiving a video frame for processing; generating one or more coding units of the video frame; and processing one or more coding units using one or more palette predictors having palette entries, wherein each palette entry of the one or more palette predictors has a corresponding reuse flag, and wherein a number of reuse flags for each palette predictor is set to a fixed number for a corresponding coding unit.

Methods for palette prediction

The present disclosure provides systems and methods for transform-skip residual video data coding and decoding. One exemplary method comprises: performing a first pass of scanning a transform coefficient of a sub-block of a video frame, wherein the first pass of scanning comprises: bypass coding a parity level flag for the transform coefficient, the parity level flag indicating a parity of an absolute value of a level of the transform coefficient.

Transform-skip residual coding of video data

The present disclosure provides systems and methods for signaling and using a palette mode in video processing. According to certain disclosed embodiments, an exemplary video processing method includes: receiving a first palette entry for palette coding a target coding unit (CU); determining whether the target CU is part of a single-tree slice; determining whether the target CU is coded with separate luma and chroma trees; and in response to the target CU being determined to be part of a single-tree slice and be coded with separate luma and chroma trees, decoding a first component of the target CU based on the first palette entry, and decoding a second component of the target CU based on a default palette entry.

Video processing method and apparatus for using palette mode

The present disclosure provides methods and apparatuses for applying intra prediction refinement to intra predicted samples. An exemplary method includes: determining a filter based on neighboring samples of intra predicted samples of a picture; generating an offset value based on the neighboring samples; refining the intra predicted samples by adding the offset value; and applying the filter to the intra predicted samples.

Methods and apparatuses for filtering intra predicted video blocks

Systems and methods for performing residual coding of video data include receiving control information for coding a video sequence and determining, based on the control information, a coding method for coding a prediction residual signal of a coding block in the video sequence. The coding method is one of a transform residual coding and a transform-skip residual coding.

Growing community of inventors

Cupertino, CA, United States of America

Mohammed Golam Sarwer