Encoder, decoder, methods and computer programs for an improved lossless compression

US11973988B2 · kind B2 · utility

Assignee

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

Inventors

• Christian Helmrich · Erlangen, DE
• Benjamin Bross · Berlin, DE
• Tung Nguyen · Berlin, DE
• Heiko Schwarz · Panketal, DE
• Detlev Marpe · Berlin, DE
• Thomas Wiegand · Berlin, DE

Key dates

• Filing date: Jan 4, 2022
• Grant date: Apr 30, 2024
• Expiry date: Aug 30, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/176
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Decoder for decoding a picture from a data stream, configured to check whether a plurality of coding parameters, which are contained in the data stream, relate to a predetermined portion of the picture and control a prediction residual transform mode and a quantization accuracy with respect to the predetermined portion, are indicative of a coding parameter setting corresponding to a lossless prediction residual coding. Responsive to the plurality of coding parameters being indicative of the coding parameter setting corresponding to the lossless prediction residual coding, the decoder is configured to set one or more predetermined coding options relating to one or more tools of the decoder for processing a prediction residual corrected predictive reconstruction with respect to the predetermined portion so that the one or more tools are disabled with respect to the predetermined portion.