Method and apparatus for decoding composite video signals

H - Electricity – 04 – N

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H04N 9/78 (2006.01)

Patent

CA 2251652

Composite video is separated into chrominance and luminance using a separation filter selected on a pixel by pixel basis accordance with horizontal, vertical and temporal differences. Signal in a subcarrier domain passes through complementary chrominance and luminance filter paths, each path containing a rate converter and a synchroniser. In the chrominance filter path a chrominance/cross-colour separation filter operating on demodulated chrominance, separates cross-colour which passing through a modulator before combination with the ouptut of the luminance filter path, information from the demodulator being carried forward for use by the remodulator.

Un signal vidéo composite est décomposé en chrominance et luminance au moyen d'un filtre de séparation choisi pixel par pixel en fonction de différences horizontales, verticales et temporelles. Le signal présent dans un domaine de sous-porteuse passe à travers des trajets de filtres de chrominance et de luminance complémentaires, chaque trajet contenant un convertisseur de débit et un synchroniseur. Dans le trajet du filtre de chrominance, un filtre de séparation de chrominance/couleur croisée fonctionnant sur une chrominance démodulée sépare la couleur croisée qui passe à travers un modulateur avant d'être combinée à la sortie du trajet du filtre de luminance, des informations venant du démodulateur étant reportées pour être utilisées par le remodulateur.

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