Entropy coding supporting mode switching

US11277614B2 · kind B2 · utility

Assignee

• GE Video Compression, LLC · US

Inventors

• Valeri George · Berlin, DE
• Benjamin Bross · Berlin, DE
• Heiner Kirchhoffer · Berlin, DE
• Detlev Marpe · Berlin, DE
• Tung Nguyen · Berlin, DE
• Matthias Preiss · Berlin, DE
• Mischa Siekmann · Berlin, DE
• Jan Stegemann · Berlin, DE
• Thomas Wiegand · Berlin, DE
• Christian Bartnik · Berlin, DE

Key dates

• Filing date: May 5, 2020
• Grant date: Mar 15, 2022
• Expiry date: May 5, 2040

Classification

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

Abstract

A decoder for decoding a data stream into which media data is coded has a mode switch configured to activate a low-complexity mode or a high-efficiency mode depending on the data stream, an entropy decoding engine configured to retrieve each symbol of a sequence of symbols by entropy decoding using a selected one of a plurality of entropy decoding schemes, a desymbolizer configured to desymbolize the sequence of symbols to obtain a sequence of syntax elements, a reconstructor configured to reconstruct the media data based on the sequence of syntax elements, selection depending on the activated low-complexity mode or the high-efficiency mode. In another aspect, a desymbolizer is configured to perform desymbolization such that the control parameter varies in accordance with the data stream at a first rate in case of the high-efficiency mode being activated and the control parameter is constant irrespective of the data stream or changes depending on the data stream, but at a second lower rate in case of the low-complexity mode being activated.