Detecting errors in video images

H - Electricity – 04 – N

Patent

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Details

H04N 7/64 (2006.01) H03M 7/30 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2166884

An error is identified in a video image by calculating frequency-related coefficients for blocks of the image and considering the statistical distribution of said coefficients. The variance of coefficients is calculated and a block of original image data is concealed if the variance calculated is significantly higher than a stored threshold and/or if said variance calculated is significantly different from variance values derived for similarly positioned blocks within a previous frame. Concealment is effected by selecting image data from a previous frame, displaced in response to transmitted motion vectors.

On identifie une erreur dans une image vidéo en calculant les coefficients relatifs à la fréquence représentant les blocs de l'image et en considérant la répartition statistique de ces coefficients. On calcule la variance des coefficients et on dissimule un bloc de données de l'image originale si la variance calculée est nettement plus élevée qu'un seuil enregistré et/ou si cette variance calculée est nettement différente des valeurs de variance dérivées de blocs positionnés de manière similaire dans une image précédente. On effectue le masquage en sélectionnant des données d'image à partir d'une image antérieure, déplacée par rapport aux vecteurs de déplacement transmis.

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