Efficient implementation of matrix-based intra-prediction

US12244864B2 · kind B2 · utility

Assignee

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

Inventors

• Jonathan PFAFF · Berlin, DE
• Björn STALLENBERGER · Berlin, DE
• Michael SCHÄFER · Berlin, DE
• Philipp MERKLE · Berlin, DE
• Tobias Hinz · Berlin, DE
• Philipp Helle · Berlin, DE
• Heiko Schwarz · Panketal, DE
• Detlev Marpe · Berlin, DE
• Thomas Wiegand · Berlin, DE
• Benjamin Bross · Berlin, DE
• Martin Winken · Berlin, DE
• Mischa Siekmann · Berlin, DE

Key dates

• Filing date: May 12, 2024
• Grant date: Mar 4, 2025
• Expiry date: May 12, 2044

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/70
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method for decoding a predetermined block of a picture using intra-prediction by reading, for each of predetermined intra-prediction blocks, from a data stream, a mode index identifying a matrix-based intra-prediction mode is disclosed. Samples of each predetermined intra-prediction block are predicted by computing a matrix-vector product between an input vector derived from reference samples and a prediction matrix associated with the identified matrix-based intra-prediction mode (k)—and associating components of an output vector obtained by the matrix-vector product onto sample positions of the predetermined block. Further predetermined intra-predicted blocks of the picture are predicted to obtain a prediction signal. A transformation flag is decoded from the data stream using context adaptive binary arithmetic coding, and a prediction residual is decoded and re-transformed using a reverse transformation based on the transformation flag to obtain a prediction residual signal. The prediction residual signal is used to correct the prediction signal.