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

US11997280B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Jonathan PFAFF · Berlin, DE
• Philipp Helle · Berlin, DE
• Michael SCHÄFER · Berlin, DE
• Tobias Hinz · Berlin, DE
• Björn STALLENBERGER · Berlin, DE
• Philipp MERKLE · Berlin, DE
• Heiko Schwarz · Panketal, DE
• Detlev Marpe · Berlin, DE
• Thomas Wiegand · Berlin, DE

Key dates

• Filing date: Aug 30, 2021
• Grant date: May 28, 2024
• Expiry date: Jul 20, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/91
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An apparatus includes an encoder, which receives image or video data, encodes the data and provides a bitstream representing the data. 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, like linear weighted intra prediction, 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.