Method and apparatus for transcoding a digitally compressed...

H - Electricity – 04 – N

Patent

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H04N 7/01 (2006.01) H04N 7/015 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2156180

A method and apparatus for transcoding macroblocks of a high definition television signal to co-sited macroblocks of a standard definition television signal wherein SD macroblocks are derived directly from co-sited HD macroblocks, i.e. without having to compute the SD macroblock information from its corresponding SD image sequence. A transcoder transcodes a first resolution to a second digital video signal having a second resolution. The transcoder has a decoder for decoding the first digital video signal to obtain a first image sequence having the first resolution. A processor retrieves first macroblock information from the first digital video signal, and derives from the first macroblock information of a group of first macroblocks of said first video signal, second macroblock information of a co-sited macroblock of the second video signal. A sampler derives a second image sequence having the second resolution from said first image sequence. An encoder encodes the second image sequence into the second digital video signal. The second digital video signal includes the second macroblock information derived from the group of first macroblocks of the first video signal.

L'invention concerne un procédé et un appareil permettant le transcodage de macroblocs d'un signal de télévision haute définition en macroblocs d'un signal de télévision de définition standard, se trouvant au même emplacement. Selon l'invention, des macroblocs de définition standard sont dérivés directement de macroblocs de haute définition se trouvant au même emplacement, cela sans qu'il soit nécessaire de calculer les informations des macroblocs de définition standard à partir de leur séquence d'images correspondante de définition standard.

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