US 12,230,001 B2
Encoder, decoder and related methods
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 Jan. 31, 2022, as Appl. No. 17/588,827.
Claims priority of application No. 22151672 (EP), filed on Jan. 14, 2022.
Prior Publication US 2023/0230283 A1, Jul. 20, 2023
Int. Cl. G06T 9/00 (2006.01); H04N 19/146 (2014.01); H04N 19/18 (2014.01); H04N 19/186 (2014.01); H04N 19/60 (2014.01)
CPC G06T 9/00 (2013.01) [H04N 19/146 (2014.11); H04N 19/18 (2014.11); H04N 19/186 (2014.11); H04N 19/60 (2014.11)] 21 Claims
OG exemplary drawing
 
1. A decoder for decoding an image information from a bitstream in which a version of the image information in color space selected among at least a primary color space and an opponent color space is encoded, the decoder comprising:
a decoding and dequantization stage, to entropy decode, from the bitstream, a quantized version of the image information in the selected color space and to perform a dequantization, to obtain a dequantized version of the image information in the selected color space, wherein the dequantized version of the image information is in transform domain, and includes a plurality of components, and is subdivided into a plurality of precincts, each precinct comprising transform coefficients covering a predetermined spatial area of the image information in the selected color space;
a reverse component transformation stage, to select for, and apply to, each band or group of bands of each precinct, one reverse component transformation from the selected color space to the primary color space, to obtain a reverse component transformed version of the image information in the primary color space, the reverse component transformation stage selecting the reverse component transformation out of a plurality of predetermined reverse component transformations based on information on the selected component transformation signalled in the bitstream, the plurality of predetermined reverse component transformations including at least one reverse component transformation from the opponent color space onto the primary color space and at least one component transformation from the primary color space to another, or the same, primary color space; and
a reverse spatial transformation stage to transform the reverse component transformed version of the image information onto a reconstructed spatial image information.