Adaptive in-loop filter with multiple feature-based classifications

US11297341B2 · kind B2 · utility

Assignee

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

Inventors

• Johannes ERFURT · Berlin, DE
• Lim Wang-Q · Berlin, DE
• Mischa Siekmann · Berlin, DE
• Heiko Schwarz · Panketal, DE
• Detlev Marpe · Berlin, DE
• Thomas Wiegand · Berlin, DE

Key dates

• Filing date: Aug 6, 2020
• Grant date: Apr 5, 2022
• Expiry date: Aug 6, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/567
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A decoder is described, which receives an encoded data stream. The encoded data stream includes data representing a picture and a classification mode parameter. The classification mode parameter specifies a certain classification to be applied to samples in the picture, the certain classification selected from a plurality of classifications. The decoder decodes the encoded data stream to obtain a reconstructed picture and the classification mode parameter, classifies samples of the reconstructed picture into one of a plurality of classes using the certain classification specified by the classification mode parameter, and filters the samples of the reconstructed picture. A sample is filtered using a filter for the class into which the sample has been classified.