Interframe encoding method and apparatus

H - Electricity – 04 – N

Patent

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H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 7/24 (2006.01) H04N 7/26 (2006.01) H04N 7/36 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2449709

In a system for encoding digital video, a method of interframe coding is described. A sequence of digital video frames may be expressed as anchor frames and at least one associated subsequent frame. The plurality of pixels (304) of the anchor frame and each subsequent frame are converted from pixel domain elements to the frequency domain elements (312). The elements are quantized (316) to emphasize those elements that are more sensitive to the human visual system and de-emphasize those elements that are less sensitive to the human visual system. The difference between each quantized frequency domain element of the anchor frame and corresponding quantized frequency domain elements of each subsequent frame are determined and encoded.

L'invention concerne un procédé de codage entre trames dans un système pour coder des images vidéo numériques. Une séquence de trames vidéo numériques peut être exprimée en trames d'ancrage et au moins une autre trame associée. Les différents pixels (304) de la trame d'ancrage et chaque autre trame sont convertis d'éléments en domaine pixel en éléments en domaine fréquence (312). Les éléments sont quantifiés (316) pour accentuer les éléments qui sont plus sensibles au système visuel humain et désaccentuer ceux qui sont moins sensibles au système visuel humain. La différence entre chaque élément en domaine fréquence quantifié de la trame d'ancrage et des éléments en domaine fréquence quantifiés correspondants de chaque autre trame est déterminée et codée.

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