Ge Video Compression, LLC

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Fraunhofer-gesellschaft Zur F&#xf6;rderung Der Angewandten Forschung E. V.

Fraunhofer-gesellschaft Zur F&#xd6;rderung Der Angewandten Forschung E.v.

Dolby Video Compression, LLC

Vidyo, Inc.

Thomson Licensing

Thomas Wiegand

Detlev Marpe

Heiko Schwarz

Heiner Kirchhoffer

Philipp Helle

Benjamin Bross

Thomas Schierl

Cornelius Hellge

Robert Philipp Skupin

Yago Sánchez De La Fuente

Tung Nguyen

Mischa Siekmann

Martin Winken

Jan Stegemann

Philipp Merkle

Christian Bartnik

Valeri George

Simon Oudin

Karsten Mueller

Tobias Hinz

Gerhard Tech

Haricharan Lakshman

Matthias Preiss

Karsten Sühring

Jonathan Pfaff

Karsten Suehring

Karsten Grueneberg

Phan Hoang Tung Nguyen

Adam Wieckowski

Ali Atef Ibrahim Khairat Abdelhamid

Sebastian Bosse

Dimitri Podborski

Björn Stallenberger

Detlef Marpe

Jens Brandenburg

Jackie Ma

Alexandros Eleftheriadis

Ofer Shapiro

Paul Haase

Santiago De Luxán Hernández

Christian Helmrich

Danny Hong

Christian Rudat

Michael Schäfer

Christian Lehmann

Paul Keydel

Thomas Haustein

Thomas Fehrenbach

Hunn Rhee

Yago Sanchez De La Fuente

Bjoern Stallenberger

Roman Rischke

Heribert Brust

Thomas Wirth

Eiko Seidel

Lars Thiele

Anastasia Henkel

Robin Rajan Thomas

Yago Sánchez

Wojciech Samek

Stephan Kaltenstadler

Gayathri Venugopal

Michael Schaefer

Baris Goektepe

Karsten Grüneberg

Serhan Gül

Aljoscha Smolic

Simone Walter

Karsten Müller

Stefan Matlage

Ivan Zupancic

Michael Schafer

Johannes Erfurt

Lim Wang-Q

Dan Grois

Yago Sanchez

Peter Kauff

Klaus-Robert Mueller

Jacob Chakareski

Georg Maier

Dominique Maniry

David Gómez-Barquero

Patrick Ndjiki-Nya

Brad Schumitsch

Wang-Q Lim

Robert Skupin

Jennifer Rasch

Soeren Becker

Soenke Schmidt

Matthias Kautzer

Bela Makai

Philipp Merkel

Gitta Kutyniok

Heiner Kirchhoffeer

Remco C Veltkamp

Karsten Gruneberg

An encoding scheme for encoding a sequence of integer values comprises encoding a value at a predetermined position and then consecutively calculating and encoding differences between neighboring values. A respective decoding scheme is also provided. These encoding and decoding schemes provide a more efficient encoding concept.

Apparatuses for encoding and decoding a sequence of integer values, methods for encoding and decoding a sequence of integer values and computer program for implementing these methods

A video data stream is rendered reducible in a manner so that the reduction leads to a restriction of pictures of the reduced video data stream to merely a predetermined subarea of the pictures of the original video data stream and in a manner so that transcoding, such as re-quantization, may be avoided and a conformance of the reduced video data stream relative to the codec underlying the original video data stream be maintained. This is achieved by providing the video data stream with information including an indication of the predetermined subarea and replacement indices for redirecting the indices included by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings.

Concept for picture/video data streams allowing efficient reducibility or efficient random access

An apparatus includes an encoder, which receives image or video data, encodes the data and provides a bitstream. The encoder includes a CABAC encoder, which receives a binary valued syntax element associated with a block of the data to be encoded, and encodes, using a selected context model, the syntax element into coded bits for the bitstream. The syntax element includes a tool flag indicating whether or not certain coding tool is employed when encoding a block of the data. For a block of the data which exhibits an aspect ratio larger than 2 and for a block of the data which exhibits an aspect ratio less than or equal to 2, and to which blocks the certain coding tool is applicable, first and second context models for encoding the tool flag are selected from a group of one or more first and second context models, respectively.

Use-case driven context model selection for hybrid video coding tools

An encoding scheme is provided for arithmetically encoding a sequence of information values into an arithmetic coded bitstream by providing the bitstream with entry point information, allowing for resuming arithmetic decoding of the bitstream from a predetermined entry point onward. A respective decoding scheme is also provided. These encoding and decoding schemes provide more efficient encoding in view of the decoding speed.

Arithmetic encoder for arithmetically encoding and arithmetic decoder for arithmetically decoding a sequence of information values, methods for arithmetically encoding and decoding a sequence of information values and computer program for implementing these methods

An apparatus configured to select a predetermined intra prediction mode out of a plurality of intra-prediction modes which includes a first set of intra-prediction modes and a second set of matrix-based intra-prediction modes. The apparatus is configured to select a subset of one or more secondary transforms dependent on the predetermined intra prediction mode so that the subset is nonempty in case of the predetermined intra prediction mode being contained in the first set of intra-prediction modes or in the second set of matrix-based intra-prediction modes. The apparatus is configured to derive a transformed version of a prediction residual for a predetermined block, which is related to a spatial domain version of the prediction residual of the predetermined block via a transform defined by a concatenation of a primary transform and a predetermined secondary transform out of the subset of secondary transforms.

Coding using matrix based intra-prediction and secondary transforms

An encoder for hybrid video coding, the encoder for providing an encoded representation of a video sequence on the basis of an input video content, and the encoder configured to: determine one or more syntax elements related to a portion of the video sequence; select a processing scheme to be applied to the portion of the video sequence based a property described by on the one or more syntax elements, the processing scheme for acquiring a sample for a motion-compensated prediction at an integer and/or fractional location within the portion of the video sequence; encode an index indicating the selected processing scheme such that a given encoded index value represents different processing schemes depending on the property described by the one or more syntax elements; and provide, as the encoded representation of the video sequence, a bit stream including the one or more syntax elements and the encoded index.

Encoders, decoders, methods, and video bit streams, and computer programs for hybrid video coding

Video data for deriving a spatially variable section of a scene therefrom as well as corresponding methods and apparatuses for creating video data for deriving a spatially variable section of a scene therefrom and for deriving a spatially variable section of a scene from video data. The video data comprises a set of source tracks comprising coded video data representing spatial portions of a video showing the scene and is formatted in a specific file format and supports the merging of different spatial portions into a joint bitstream through compressed-domain processing.

Merging friendly file format

An apparatus for presenting immersive media content is described. The apparatus obtains from a sender video data representing immersive content for a certain viewing direction and/or for a certain viewpoint, and displays the video data representing the immersive content for the certain viewing direction and/or for the certain viewpoint.

Immersive media content presentation and interactive 360° video communication

Video coding concepts are described which relate to encoding, decoding, extracting and mixing video data streams having encoded therein pictures in a manner subdivided into independently coded subpictures. The concepts relate to an extraction of subpicture specific video data streams having a layer of subdivided pictures and a layer of un-subdivided pictures, a handling of inter-layer prediction tools and a handling of scaling windows for inter-layer prediction for such video data streams, a determination of decoder capability requirements for such data streams, layer-specific constraints for such data streams, and mixing of subpictures encoded with different types of independent coding.

Subpicture-related video coding concepts

A higher coding efficiency for coding a significance map indicating positions of significant transform coefficients within a transform coefficient block is achieved by the scan order by which the sequentially extracted syntax elements indicating, for associated positions within the transform coefficient block, as to whether at the respective position a significant or insignificant transform coefficient is situated, are sequentially associated to the positions of the transform coefficient block, among the positions of the transform coefficient block depends on the positions of the significant transform coefficients indicated by previously associated syntax elements. Alternatively, the first-type elements may be context-adaptively entropy decoded using contexts which are individually selected for each of the syntax elements dependent on a number of significant transform coefficients in a neighborhood of the respective syntax element, indicated as being significant by any of the preceding syntax elements.

Coding of significance maps and transform coefficient blocks

Interpolation between explicitly signaled CPB (or HRD) parameters at selected bit rates is used to achieve a good compromise between CPB parameter transmission capacity and CPB parametrization effectiveness and may be, particularly, made in an effective manner.

Video coding using a coded picture buffer

Concepts for transform coefficient block coding are described which enable coding of coefficients of a transform block in a manner suitable for dependent quantization and effectively implementable by entropy coding in terms of coding efficiency.

Entropy coding of transform coefficients suitable for dependent scalar quantization

Decomposing a value range of the respective syntax elements into a sequence of n partitions with coding the components of z laying within the respective partitions separately with at least one by VLC coding and with at least one by PIPE or entropy coding is used to greatly increase the compression efficiency at a moderate coding overhead since the coding scheme used may be better adapted to the syntax element statistics. Accordingly, syntax elements are decomposed into a respective number n of source symbols swith i=1 . . . n, the respective number n of source symbols depending on as to which of a sequence of n partitions into which a value range of the respective syntax elements is sub-divided, a value z of the respective syntax elements falls into, so that a sum of values of the respective number of source symbols syields z, and, if n>1, for all i=1 . . . n−1, the value of scorresponds to a range of the ipartition.

Entropy encoding and decoding scheme

File format concepts for video files are described. It is proposed to that descriptive data of a file indicates whether a parameter set for a track of a file is forwarded when jointly decoding a sub-stream of the track and a further track, and/or that a file includes, for a sub-stream of a video stream signaled in the file, an alternative parameter set to a parameter set for fully decoding the track, the alternative parameter set being for decoding the sub-stream, so as to allow for switching between multiple tracks of a file, and/or that step-wise stream access pictures of a track of a file are marked as stream access point pictures for accessing the track, and/or that a temporal length within which a decoder refresh in case of a joint decoding of sub-streams distributed over multiple tracks is indicated in a file, and/or that a file provides information from which it is derivable whether a pixel aspect ratio varies.

File format schemes allowing efficient ROI, stream access and parameter set handling

The present invention is concerned with decoders, encoders and corresponding methods for handling video data streams () comprising a first sub-bitstream (-) and a second sub-bitstream (-). The herein described concept provides solutions for mixing, within an access unit (), different NAL units () of different NAL unit types. For example, RAP NAL unit types may be mixed with different IRAP NAL unit types or non-IRAP NAL unit types, and non-IRAP NAL unit types may be mixed with different non-IRAP NAL unit types.

Decoder, encoder and methods for mixing NAL units of different NAL unit types in video streams

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Berlin, Germany

Thomas Wiegand