Refined block-based predictive coding and decoding of a picture

US12120321B2 · kind B2 · utility

Assignee

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

Inventors

• Phan Hoang Tung NGUYEN · Berlin, DE
• Gerhard Tech · Berlin, DE
• Jonathan PFAFF · Berlin, DE
• Michael SCHÄFER · Berlin, DE
• Jennifer RASCH · Berlin, DE
• Tobias Hinz · Berlin, DE
• Heiko Schwarz · Panketal, DE
• Detlev Marpe · Berlin, DE
• Thomas Wiegand · Berlin, DE

Key dates

• Filing date: Sep 29, 2020
• Grant date: Oct 15, 2024
• Expiry date: May 26, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/20056
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The refinement of block-based predictive coding and decoding of pictures as applicable in, e.g., hybrid video codecs, using additional reconstructed samples or residuals is described. An apparatus for block-based predictive decoding of a picture is described. The apparatus includes a combiner configured to combine a residual signal a predetermined block of the picture and a reference signal for the predetermined block so as to obtain a first spectrum, the residual signal correcting a prediction error of a prediction of the predetermined block of the picture; a reducer configured to perform thresholding on the first spectrum to obtain a second spectrum so that coefficients below a threshold value are set to a predefined value; an extractor configured to obtain from the second spectrum a modified version of the residual signal; and a reconstructor block configured to decode the predetermined block of the picture from the data stream on the basis of the modified version of the residual signal.