Partial decoding of compressed video sequences

Details Partial decoding of compressed video sequences Partial decoding of compressed video sequences

H - Electricity

04

N

H04N 7/30 (2006.01)

Patent

CA 2310652

Compressed video sequences generated using a (e.g., DCT) transform are partially decoded (202) to recover (204) the low-frequency transform coefficients (e.g., only the DC coefficients) from the encoded bitstream. The low-frequency coefficients are then used to generate blocks of image data that are subjected to motion-compensated inter-frame addition (206) to generate partially decoded images that can be used for subsequent processing, such as histogram analysis (208) for video parsing. The present invention avoids having to perform the computationally expensive inverse transform operations, while still achieving satisfactory results.

L'invention porte sur le décodage partiel (202) de séquences vidéo comprimées obtenues au moyen d'une transformée (par exemple TCD) pour récupérer (204) les coefficients de transformation à audiofréquence (par exemple uniquement les coefficients DC) à partir du flux binaire codé. Les coefficients à basse fréquence servent alors à produire des blocs de données d'images qui sont soumis à une addition inter-trame (206) compensée en mouvement de manière à obtenir des images partiellement décodées pouvant servir pour des processus ultérieurs tels que l'analyse d'histogrammes (208) à des fins de parsage vidéo. L'invention permet d'éviter les opérations de transformation inverse coûteuses en informatique tout en fournissant des résultats satisfaisants.

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