Matrix based intra prediction with mode-global settings

US12041222B2 · kind B2 · utility

Assignee

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

Inventors

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

Key dates

• Filing date: Dec 4, 2020
• Grant date: Jul 16, 2024
• Expiry date: Jul 4, 2041

Classification

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

Abstract

Apparatus for decoding a predetermined block (18) of a picture using intra-prediction, configured to read, from the data stream (12), a mode index (200), the mode index pointing to one out of a list (204) of matrix-based intra-prediction modes. Additionally, the apparatus is configured to predict samples (108) of the predetermined block (18) by computing a matrix-vector product (206) between an input vector (102) derived from reference samples (17) in a neighborhood of the predetermined block (18) and a prediction matrix (19) associated with the matrix-based intra-prediction mode (k) pointed to by the mode index (200) and associating components (210) of an output vector (208) obtained by the matrix vector product (206) onto sample positions (104) of the predetermined block. For each matrix-based intra-prediction mode, all entries of the prediction matrix (19) associated with the respective matrix-based intra-prediction mode are represented by a fixed point representation of a predetermined bit-depth, the predetermined bit-depth being equal for the matrix-based intra-prediction modes. Furthermore, the apparatus is configured to, for each matrix-based infra-prediction mode, compute t…