Telefonaktiebolaget Lm Ericsson (publ)

Velos Media, LLC

Kenneth Andersson

Rickard Sjöberg

Jacob Ström

Zhi Zhang

Jonatan Samuelsson

Jack Enhorn

Per Wennersten

Andrey Norkin

Ruoyang Yu

Thomas Rusert

Clinton Priddle

Martin Pettersson

Du Liu

Per Hermansson

Mitra Damghanian

Per Fröjdh

Zhuangfei Wu

Ying Wang

Davood Saffar

Richard Sjöberg

Christopher Hollmann

Andreas Rossholm

Kristofer Dovstam

Julien Michot

Zhuangfel Wu

Yuan Chun Wu

Olie Baumann

Simon Ekström

Signe Sidwall Thygesen

Jacob STRÖM

Rickard SJÖBERG

There is provided a method of encoding a picture. The method comprises selecting a motion vector. MV, for a current block within the picture. The method comprises determining whether a condition is satisfied, wherein determining whether the condition is satisfied comprises: (i) determining if a subblock-based motion refinement is applicable for the current block and (ii) determining if a first subblock within the current block satisfies a criteria. The method comprises, as a result of determining that the condition is satisfied, not using the selected MV for encoding the current block.

Selective subblock-based motion refinement

There is provided a method. The method comprises obtaining an input video frame data associated with an input video frame. The method comprises performing a deblocking filtering operation on one or more samples included in the input video frame, thereby generating one or more deblocked samples. The method further comprises performing a machine-learning (ML)-based filtering operation and/or adaptive loop filtering operation on one or more samples included in the input video frame, thereby generating one or more filtered samples. The method comprises, using said one or more deblocked samples and/or said one or more filtered samples, producing encoded or decoded video frame data including an encoded or decoded video frame.

Combining deblock filtering and another filtering for video encoding and/or decoding

A method () for processing an image. The method includes obtaining (s) a set of sample values associated with the image, the set of sample values comprising a current sample value and sample values neighboring the current sample value, wherein the obtained set of sample values is included within a rectangular block of sample values, and the current sample value has a vertical position, y. The method also includes selecting (s) a filter strength value based on y, wherein selecting the filter strength value based on y comprises: selecting a first filter strength value if a condition is satisfied, otherwise if the condition is not satisfied selecting a second filter strength value, wherein the condition is satisfied only when y is equal to a predetermined value and the condition is not satisfied if y is not equal to the predetermined value. The method also includes filtering (s) the current sample based on the selected filter strength value.

Adaptive loop filter (ALF) virtual boundry processing

A method for deblocking at least one boundary of a coding unit, wherein the boundary forms a first side and a second side of the coding unit, wherein a video picture comprises the coding unit, and wherein the first and second sides use a same reference picture. The method includes obtaining a first motion vector component in the first side; obtaining a second motion vector component in the second side; determining whether an absolute difference between the first motion vector component and the second motion vector component is equal to or larger than a predetermined threshold that is less than 1 sample; and as a result of determining that the absolute difference between the first motion vector component and the second motion vector component is equal to or larger than the predetermined threshold, applying deblocking to the vertical or horizontal boundary between the first side and the second side.

Deblocking using sub-PEL motion vector threshold

A method for deblocking is provided. The method includes checking whether a size of a current block exceeds a size threshold. The method includes checking whether a size of an adjacent block exceeds the size threshold. The adjacent block is adjacent to a boundary of the current block. The method includes determining that a criteria is true. The criteria comprises both a size of the current block and a size of the adjacent block exceeding the size threshold. The method includes, as a result of determining that the criteria is true, applying a long-tap deblocking across the boundary of the current block. A length of the long-tap deblocking is greater than 7.

Extra-long tap deblocking

The long filter decision in VVC is modified by adding at least one gradient check that at least includes sample p6 or q6. This makes it possible to avoid using the long filters when there is some natural structure at sample p6 or q6. In one specific embodiment at least two gradient checks including both q6 and p6 are added. In another embodiment, the dpq threshold is modified from beta>>2 to beta>>4. This threshold change embodiment may be used in conjunction with or instead of the embodiment in which a gradient check that includes p6 and/or q6 is added to the long filter decision.

Deblocking filter selection in video or image coding

A prediction unit for an encoder or decoder implements matrix based intra prediction. Input boundary samples for a current block are downsampled to obtain reduced boundary samples for matrix multiplication and/or linear interpolation, or both. In one embodiment, downsampling is performed in a manner that aligns the reduced boundary samples with an output of a matrix multiplication unit of the prediction unit. In other embodiments, downsampling is performed without averaging. The embodiments reduce the complexity of the prediction unit and the latency of the encoder or decoder.

Simplified downsampling for matrix based intra prediction

A method for making a smooth prediction block of samples in a picture in an image or video encoder or decoder is provided. The method includes determining parameters r of a polynomial model by r=(BB)*(B*x), where B is a matrix of bases and x is a source of samples in vector form. The method includes predicting a block x' based on the parameters r and the matrix of bases B.

Smooth surface prediction

A method, decoder, and apparatus are provided. Responsive to a current block being a MIP predicted block, it is determined whether it has one or multiple transform blocks. A MIP weight matrix to be used to decode the current block is determined based on a MIP prediction mode. Responsive to the MIP predicted block having one transform block, the MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream. Responsive to the MIP predicted block having multiple transform blocks: deriving a first MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream and remaining MIP predicted blocks are derived based further on decoded elements in at least one decoded transform block of the current block. The MIP predicted block(s) are output for subsequent processing.

Allowing a matrix based intra prediction block to have multiple transform blocks

A deblocking the method. The method includes deblocking a block boundary between a first block (B1) and a second block (B2) with the restriction that not more than 5 samples are modified on the B2 side of the block boundary as a result of the deblocking. The deblocking method also includes deblocking a sub-block boundary within the B2 block such that not more than 2 samples on the side of the sub-block boundary within the B2 block that is closest to the block boundary between B1 and B2 are modified by the deblocking.

Deblocking between block boundaries and sub-block boundaries in a video encoder and/or video decoder

There is provided a method for encoding or decoding an image. The method comprises obtaining a first luma sample value, L1, associated with the image. The method comprises obtaining a second luma sample value, L2, associated with the image. The method further comprises obtaining a first luma delta value, ΔL1, wherein ΔL1=L2−L1. The method comprises obtaining a first product, P1, using ΔL1 and a first coefficient value, C1, wherein P1=(C1)(ΔL1). The method comprises calculating a first residual correction value, ΔI1 using P1 and a set of other products. The method comprises filtering an unfiltered chroma value, R, associated with the image using the first residual correction value, ΔI1, thereby producing a filtered chroma value Rassociated with the image.

Low complexity image filter

A first filter decision value is calculated for a block of pixels in a video frame based on pixel values of pixels in a first line of pixels in the block. A second filter decision value is also calculated for the block based on pixel values of pixels in a corresponding first line of pixels in a neighboring block in the video frame. The first filter decision value is used to determine how many pixels in a line of pixels in the block to filter relative to a block boundary between the block and the neighboring block. The second filter decision value is used to determine how many pixels in a corresponding line of pixels in the neighboring block to filter relative to the block boundary.

Deblocking filtering control

A method for deblocking at least one boundary of a coding unit. The method includes determining that the coding unit uses a sub-block transform, wherein the sub-block transform generates a transform sub-block boundary within the coding unit, thereby forming at least a transform sub-block within the coding unit; as a result of determining that the coding unit uses the sub-block transform, determining a maximum filter length based on a dimension of the transform sub-block within the coding unit, wherein the maximum filter length indicates a maximum number of samples to modify when deblocking a boundary of the coding unit; and deblocking the boundary of the coding unit based on the determined maximum filter length.

Deblocking of transform sub-block boundaries

A method for deriving a value for a first syntax element, Syntax_A. The method comprises determining whether Syntax_A is present in a bitstream. The method comprises, as a result of determining that Syntax_A is not present in the bitstream, deriving the value for Syntax_A to be equal to a first value, B, if a first condition is satisfied, or deriving the value for Syntax_A to be equal to a second value, C, if a second condition is satisfied.

Video processing

A deblocking method for deblocking a boundary between a first block of samples, block P, and a second block of samples, block Q. The method includes determining whether at least one of the P block or the Q block is a combined intra-inter prediction block; and, as a result of determining that at least one of the P block or the Q block is a combined intra-inter prediction block, deblocking the boundary between the P block and the Q block.

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Gävle, Sweden

Kenneth Andersson