System and method for improving the quality of compressed...

G - Physics – 06 – T

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G06T 5/00 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2731240

Systems and methods are disclosed for improving the quality of compressed digital video signals by separating the video signals into Deblock and Detail regions and, by smoothing the entire frame, and then by over-writing each smoothed frame by a preserved Detail region of the frame. The Detail region may be computed only in Key Frames after which it may be employed in adjacent frames in order to improve computational efficiency. This improvement is enhanced by computing an Expanded Detailed Region in Key Frames. The concept of employing a smooth Canvas Image onto which the Detail image is overwritten is analogous to an artist first painting the entire picture with an undetailed Canvas (usually using a broad large brush) and then over-painting that Canvas with the required detail (usually using a small fine brush).

Linvention concerne des systèmes et procédés pour améliorer la qualité de signaux vidéo numériques compressés en divisant les signaux vidéo en régions de dégroupage et de détail, en lissant la trame complète, en recouvrant chaque trame lissée par une région de détail conservé de la trame. La région de détail peut être calculée seulement en trames clés après quoi elle peut être utilisée dans des trames adjacentes afin daméliorer le rendement calculatoire. Cette amélioration est renforcée en calculant une région détaillée étendue dans des trames clés. Le concept dutilisation dune image de toile lisse, sur laquelle limage de détail est superposée, est analogue à un artiste peignant dabord le tableau complet avec une toile non détaillée (en utilisant habituellement un gros pinceau large) et peignant ensuite en recouvrant cette toile avec le détail nécessaire (en utilisant habituellement un petit pinceau fin).

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