US 12,149,744 B2
Apparatus and method for encoding and decoding a sequence of pictures using a buffered transform signal approximation
Thomas Richter, Erlangen (DE); Wolfgang Heppner, Erlangen (DE); Joachim Keinert, Erlangen (DE); Siegfried Fößel, Erlangen (DE); Herbert Thoma, Erlangen (DE); Christian Scherl, Erlangen (DE); Christian Minuth, Erlangen (DE); Bilal Ahmed, Erlangen (DE); Nisha Bhaskar, Erlangen (DE); and Heiko Sparenberg, Erlangen (DE)
Assigned to FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed on Jul. 5, 2023, as Appl. No. 18/347,354.
Application 18/347,354 is a continuation of application No. 17/576,064, filed on Jan. 14, 2022, granted, now 11,736,731.
Prior Publication US 2023/0345050 A1, Oct. 26, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/64 (2014.01); H04N 19/105 (2014.01); H04N 19/172 (2014.01); H04N 19/18 (2014.01)
CPC H04N 19/647 (2014.11) [H04N 19/105 (2014.11); H04N 19/172 (2014.11); H04N 19/18 (2014.11)] 32 Claims
OG exemplary drawing
 
1. An apparatus for decoding a sequence of pictures from a data stream, wherein the apparatus is configured for
decoding a picture of the sequence, the picture comprising one or more two-dimensional arrays comprising sample values, by
deriving a residual transform signal of the picture from the data stream,
combining the residual transform signal with a buffered transform signal approximation of a previous picture of the sequence so as to acquire a transform signal representing the picture, the transform signal comprising a plurality of transform coefficients, and
subjecting the transform signal to an inverse spatial decorrelation transformation to acquire a spatial representation of the picture, and
deriving the buffered transform signal approximation from a further transform signal representing the previous picture so that the buffered transform signal approximation comprises approximations of further transform coefficients of the further transform signal.