Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Stephan Kaltenstadler

Detlev Marpe

Heiko Schwarz

Philipp Helle

Mischa Siekmann

Martin Winken

Jonathan Pfaff

Wojciech Samek

Thomas Wiegand

Philipp Merkle

Adam Wieckowski

Björn Stallenberger

Dominique Maniry

Thomas Wiegard

An apparatus for block-wise decoding a picture from a data stream and/or encoding a picture into a data stream, the apparatus supporting at least one intra-prediction mode according to which the intra-prediction signal for a block of a predetermined size of the picture is determined by applying a first template of samples which neighbours the current block onto a neural network. The apparatus may be configured, for a current block differing from the predetermined size, to:

Intra-prediction mode using downsampling for block-wise picture coding

In accordance with a first aspect, an improved compression efficiency is achieved by letting a block-wise picture codec support a set of intra-prediction modes according to which the intra-prediction signal for a current block of a picture is determined by applying a set of neighboring samples of the current block onto a neural network. A second aspect of the present application is that, additionally or alternatively to the spending of neural network-based intra-prediction modes, the mode selection may be rendered more effective by the usage of a neural network dedicated to determine a rank or a probability value for each of the set of intra-prediction modes by applying a set of neighboring samples thereonto with the rank or probability value being used for the selection of one intra-prediction mode out of the plurality of intra-prediction modes including or coinciding with the set of intra-prediction modes.

Intra-prediction mode concept for block-wise picture coding

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Berlin, Germany

Stephan Kaltenstadler