Apparatus and method 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 a residual transform signal with a buffered transform signal approximation of a previous pic...

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Hauptverfasser: Fößel, Siegfried, Scherl, Christian, Thoma, Herbert, Ahmed, Bilal, Richter, Thomas, Sparenberg, Heiko, Minuth, Christian, Keinert, Joachim, Bhaskar, Nisha, Heppner, Wolfgang
Format: Patent
Sprache:eng
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Zusammenfassung: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.