Transcoder-based adaptive quantization for digital video...

Details Transcoder-based adaptive quantization for digital video... Transcoder-based adaptive quantization for digital video...

H - Electricity

04

N

H04N 7/26 (2006.01) H04N 5/76 (2006.01) H04N 7/36 (2006.01) H04N 5/781 (2006.01) H04N 9/804 (2006.01)

Patent

CA 2421066

The present invention provides a transcoding architecture and a consumer set- top box with storage capability that is based on the transcoding architecture and capable of operating efficiently in an all-digital environment. In a preferred embodiment, a digital-VIDEO DEVICE employs an MPEG-2 compliant transcoder that includes a simplified cascaded decoder and encoder, and is capable of performing determinable bitrate re-encoding without conducting motion estimation. During recording, the decoder receives and processes a compressed source bitstream, producing a decoded bitstream that includes reconstructed video and preserved motion vectors. The encoder "re-encodes" the decoded bitstream using the preserved motion vectors and performs any applicable bitrate modifications. The re-encoded bitstream is then stored.

L'invention concerne une architecture de transcodage et un boîtier décodeur d'usager comportant une capacité de stockage basée sur l'architecture de transcodage, et capable de fonctionner efficacement dans un environnement tout-numérique. Dans une forme de réalisation préférée, un dispositif vidéo numérique utilise un transcodeur de type MPEG-2 qui comprend un décodeur et un codeur simplifiés en cascade, et est capable de mettre en oeuvre un recodage de débit binaire déterminable sans estimation de mouvement. Pendant l'enregistrement, le décodeur reçoit et traite un train de bits source comprimé, produisant un train de bits décodé incluant une vidéo reconstruite et des vecteurs de mouvement conservés. Le codeur recode le train de bits décodé à l'aide des vecteurs de mouvement conservés et effectue toutes les modifications de débit binaire applicables. Le train de bits recodé est ensuite stocké.

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