Non-linear switched video filter for television picture...

H - Electricity – 04 – N

Patent

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H04N 5/21 (2006.01)

Patent

CA 2063737

Temporally filtered video samples are formed as the sum of a previous frame output sample (P) and a nonlinear function of the difference between current (S) and previous (P) samples. The function is nonlinear only for absolute values of differences less that 50 % (preferably 10 %) of the maximum range of the difference, and a smaller lookup table is used for implementing the nonlinear function than would otherwise be the case.

Des échantillons vidéo filtrés de façon temporaire sont formés comme étant la somme d'un échantillon de sortie d'une mémoire précédente (P) et d'une fonction non-linéaire de la différence entre le courant (S) et des échantillons précédents (P). La fonction est non-linéaire uiquement pour les valeurs absolues des différences inférieures à 50 % (préférablement 10 %) de l'éventail maximum des différences, et on utilise une plus petite table de consultation pour mettre en application la fonction non-linéaire, que celle utilisée normalement.

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