Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Nisha Bhaskar

Herbert Thoma

Thomas Richter

Christian Scherl

Wolfgang Heppner

Bilal Ahmed

Christian Minuth

Siegfried Fößel

Joachim Keinert

Heiko Sparenberg

There is disclosed an encoder, a decoder, related methods, and non-transitory storage units storing instructions which, when executed by a computer, cause the computer to perform the methods. At an encoder (), after a spatial transformation stage (), there is obtained a spatially transformed version () of input image information () having multiple bands and, for each band, multiple transform band coefficients. After the generation of precincts (), each comprising transform coefficients covering a predetermined spatial area of the input image information (), there is provided a component transformation stage (), to apply one component transformation (CTr) selected () out of a plurality of predetermined component transformations, to each band (') of each precinct (). Hence, there is obtained a spatially transformed and color transformed version () of the input image information (), which is subsequently quantized and entropy encoded.

Encoder, decoder and related methods

An apparatus for decoding a sequence of pictures from a data stream is configured for decoding a picture of the sequence by deriving a residual transform signal of the picture from the data stream; combining a residual transform signal with a buffered transform signal approximation of a previous picture of the sequence so as to obtain a transform signal representing the picture, the transform signal having a plurality of transform coefficients; and subjecting the transform signal to a spectral-to-spatial transformation. The apparatus is configured for deriving the buffered transform signal approximation from a further transform signal representing the previous picture so that the buffered transform signal approximation has approximations of further transform coefficients of the further transform signal.

Apparatus and method for encoding and decoding a sequence of pictures using a buffered transform signal approximation

Operation method of electronic device for encoding and decoding a sequence of pictures using a buffered transform signal approximation

An apparatus for decoding a sequence of pictures from a data stream is configured for decoding a picture of the sequence by: deriving a residual transform signal of the picture from the data stream; combining the residual transform signal with a buffered transform signal of a previous picture of the sequence so as to obtain a transform signal of the picture, the transform signal representing the picture in spectral components; and subjecting the transform signal to a spectral-to-spatial transformation, wherein the buffered transform signal comprises a selection out of spectral components representing the previous picture.

Encoding and decoding a sequence of pictures

An apparatus for decoding a sequence of pictures from a data stream is configured for decoding a picture of the sequence by deriving a residual transform signal of the picture from the data stream; combining a residual transform signal with a buffered transform signal approximation of a previous picture of the sequence so as to obtain a transform signal representing the picture, the transform signal comprising a plurality of transform coefficients; and subjecting the transform signal to a spectral-to-spatial transformation. The apparatus is configured for 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.

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Erlangen, Germany

Nisha Bhaskar