Telefonaktiebolaget Lm Ericsson (publ)

Velos Media, LLC

Ericsson Ab

Rickard Sjöberg

Jonatan Samuelsson

Martin Pettersson

Mitra Damghanian

Kenneth Andersson

Jacob Ström

Ruoyang Yu

Zhi Zhang

Per Wennersten

Andrey Norkin

Thomas Rusert

Jack Enhorn

Clinton Priddle

Du Liu

Magnus Westerlund

Zhuangfei Wu

Davood Saffar

Chris Phillips

Robert Hammond Forsman

Bo Burman

Per Fröjdh

Sarel Cohen

Alois Martin Bock

Kristofer Dovstam

Thorsten Lohmar

Jörg Huschke

Richard Mitic

Markus Kampmann

Torbjörn Einarsson

Christopher Hollmann

Joel Askelöf

Torbjörm Einarsson

Ian Tapp

Zhuangfel Wu

A method of decoding an encoded image includes obtaining a layer identification, Layer ID, indicator from a first field of a header for a network abstraction layer, NAL, unit of the encoded image, determining whether the Layer ID indicator is less than a start value, in response to determining that the Layer ID indicator is not less than the start value, determining the Layer ID value based on the Layer ID indicator and based on an extension value provided in a second field of the header, and decoding the NAL unit based on the Layer ID value. Related decoders, encoding methods, encoders and computer program products are disclosed.

Extension of header values in video and image coding units

A method for decoding a picture. The method includes determining a picture width value (PW) for the picture and determining tile width value (TW) based on one or more code words from a bitstream. The method also includes obtaining a remaining width value (RW), where RW value is less than or equal to X, where X is equal to PW−TW. The method also includes determining whether RW is not less than TW. And the method also includes, as a result of determining that RW is not less than TW, setting the value of a column width variable equal to TW.

Uniform tile split with remainder

There are provided mechanisms for processing encoded image data. The method comprises receiving an encoded bitstream comprising parameter set information. The parameter set information may comprise a syntax indicator, a first coded portion comprising first coded sample information for a picture and a second coded portion comprising second coded sample information for the picture. The method further comprises, responsive to a first value of the syntax indicator, decoding the first coded sample information using a picture header syntax element from a picture header of the encoded bitstream. The method further comprises, responsive to the first value of the syntax indicator, decoding the second coded sample information using the picture header syntax element from the picture header of the encoded bitstream.

Methods providing encoding and/or decoding of video using a syntax indicator and picture header

A process for selecting a transform set for a prediction block. The process can be used in both an encoder and a decoder. For example, the process can be used in both an encoder and a decoder for a prediction block that has been predicted from a reference block. In some embodiments, both the prediction block and the reference block are intra blocks.

Transform selection in a video encoder and/or video decoder

A method for determining one or more temporal sublayer properties from a bitstream is provided. The method includes determining, from the bitstream, a number N of temporal sublayers for which one or more temporal sublayer properties are specified. The method includes for each temporal sublayer of the N temporal sublayers having one or more temporal sublayer property values, decoding the one or more temporal sublayer property values from the bitstream wherein the one or more temporal sublayer property values includes one or more of: sublayer referencing information; output sublayer set information; picture width and picture height per temporal sublayer information; sublayer multiview information; sublayer auxiliary information; and/or sublayer quality information.

Temporal sublayer information for video 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 performed by a video encoder for encoding a current picture belonging to a temporal level identified by a temporal_id. The method includes determining a Reference Picture Set (RPS) for the current picture indicating reference pictures that are kept in a decoded picture buffer (DPB) when decoding the current picture, and when the current picture is a temporal switching point. The method further includes operating to ensure that the RPS of the current picture includes no picture having a temporal_id greater than or equal to the temporal_id of the current picture.

Arrangements and methods of encoding picture belonging to a temporal level

There is provided a method for processing a bitstream. The method comprises determining a value, N, wherein N identifies a number of ordered layer representations, wherein N is greater than or equal to 3 such that the N ordered layer representations comprises a highest layer representation, a second highest layer representation, and a third highest layer representation. The method further comprises determining a value for the highest layer representation. The method comprises, after determining the value for the highest layer representation and before determining a value for the third highest layer representation, determining a value for the second highest layer representation. The method comprises, after determining the value for the second highest layer representation, determining a value for the third highest layer representation.

Derivation of a value for each layer representation of a bitstream

Methods to decode a picture from a bitstream are discussed. A partitioning structure of the picture is determined, wherein the partitioning structure defines at least first and second partitions of the picture. At least one dependency syntax element is decoded from the bitstream, and whether the second partition is dependent on or independent of the first partition is determined based on the at least one dependency syntax element. The picture is decoded from the bitstream based on determining whether the second partition of the picture is dependent on or independent of the first partition of the picture. Related methods of encoding and related devices are also discussed.

Methods providing encoding/decoding of dependent/independent partitions and related devices

A method for decoding a video bitstream comprising a sequence of pictures comprising a picture A and a picture B, wherein picture A starts a recovery point period and picture B ends the recovery point period. The method includes obtaining the video bitstream and decoding from the video bitstream a normative indication of the recovery point period. The normative indication of the recovery point period indicates that picture A starts the recovery point period and/or that picture B ends the recovery point period.

Normative indication of recovery point

A method for decoding a current block in a current picture of a video bitstream includes decoding, from the video bitstream, a first motion vector for the current block relative to a first reference block of a first reference picture having a first picture order count, and decoding, from the video bitstream, a second motion vector for the current block relative to a second reference block of a second reference picture having a second picture order count. A similarity metric is generated based on a comparison of the first motion vector and the second motion vector. The method further includes determining whether to refine the first motion vector based on the similarity metric, generating a first refined motion vector from the first motion vector, and performing motion compensation to derive a first reference block from the first reference picture using the first refined motion vector.

Side motion refinement in video encoding/decoding systems

A method for decoding a picture comprising a virtual boundary from a coded video bitstream. The method includes determining one or more of a maximum picture width or a maximum picture height from one or more syntax elements S1 in the coded video bitstream and determining one or more of a current picture width or a current picture height from one or more syntax elements S2 in the coded video bitstream. The method also includes determining that a virtual boundary syntax element in the coded video bitstream is encoded with a bit length derived from (i) one or more of the maximum picture width or the maximum picture height or (ii) one or more of the current picture width or the current picture height. The method also includes deriving the bit length for the virtual boundary syntax element based on (i) the one or more of the maximum picture width or maximum picture height as a result of determining that a virtual boundary syntax element in the coded video bitstream is encoded with a bit length derived from one or more of the maximum picture width or the maximum picture height or (ii) the one or more of the current picture width or the current picture height as a result of determining that a virtual boundary syntax element in the coded video bitstream is derived from one or more of the current picture width or the current picture height. The method also includes decoding the virtual boundary syntax element from the bitstream based on the derived bit length and determining a spatial picture position of the virtual boundary based on the decoded virtual boundary syntax element.

Virtual boundary signaling

A methods and apparatuses for encoding or decoding a segment in a coded picture. The decoding may include obtaining from a bitstream a value of a first codeword that indicates whether the coded picture may contain bi-directional inter coded segments or not. The decoding may include, based on the value of the first codeword, deriving one or more parameter values by either (a) decoding one or more parameters from the bitstream to obtain the one or more parameter values or (b) inferring the one or more parameter values. The decoding may include decoding the segment in the coded picture based on the one or more parameter values. The encoding may include encoding the first codeword to the bitstream and determining whether to encode one or more parameter values in the bitstream based on a determination of whether the coded picture will contain bi-directional inter coded segments or not.

Decoding based on bi-directional picture condition

A method and decoder is provided for decoding at least one current picture from a bitstream. An indicator value is decoded from the bitstream specifying at least one rule of a plurality of rules, the at least one rule applied to ordering of segments coded in the bitstream, wherein the segments are segments in a segment partition layout. A set of syntax elements from the bitstream specifying a segment partition layout is decoded. A segment partition layout based on the set of syntax elements is derived. The at least one current picture in the bitstream is decoded using the segment partition layout, wherein the ordering of the segments complies with the at least one rule specified. An encoder and corresponding method define the segment partition layout, selects the at least one rule from a set of rules, and encodes the segment partition layout and the indicator value into the bitstream.

Picture segment ordering

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.

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Stockholm, Sweden

Rickard Sjöberg