A transcoder

H - Electricity – 04 – N

Patent

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Details

H04N 7/26 (2006.01) H03M 7/30 (2006.01) H04N 7/32 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2187793

A transcoder for the conversion of video signals between a first and a second coding scheme employing motion compensation comprises a decoder (28) for decoding a received data stream encoded according to a first coding scheme and an encoder (30) for encoding a data stream from the decoder into a data stream according to a second coding scheme. The decoder (28) extracts motion vectors from the received data stream and passes them (42) to the data stream of the encoder, so avoiding the recalculation of the motion vectors. Drift compensation means (52-64; 70-78) may be provided to compensate for any resulting drift after a picture frame.

Un transcodeur, utilisé dans la conversion de signaux vidéo entre un premier et un second code à l'aide d'une technique de compensation de déplacement, comprend un décodeur (28) qui décode un flux de données reçues, codé selon un premier code, et un codeur (30) qui code un flux de données provenant du décodeur en un flux de données selon un second code. Le décodeur (28) extrait des vecteurs de déplacement du flux de données reçues et les fait passer (42) dans le flux de données du codeur, ce qui évite de recalculer les vecteurs de déplacement. Un dispositif de compensation de dérive (52-64; 70-78) peut être ménagé afin de compenser toute dérive résultante après une trame d'images.

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