Rate control with picture-based lookahead window

Details Rate control with picture-based lookahead window Rate control with picture-based lookahead window

H - Electricity

04

N

H04N 7/12 (2006.01) H04N 11/02 (2006.01)

Patent

CA 2507503

A method of encoding frames of an uncompressed digital video stream includes analyzing a frame of the uncompressed digital video stream with a first algorithm (MPEG2) to measure a first value of the frame's complexity and to assign the frame's picture type, and estimating a second value of the frame's complexity using the first measured value as a parameter. The frame is then encoded with a distinct second algorithm (H.264) employing the second value of the frame's complexity and the first frame's picture type as parameters.

L'invention concerne un procédé de codage de trames d'un flot vidéo numérique non compressé. Ce procédé consiste à analyser une trame du flot vidéo numérique non compressé avec un premier algorithme (MPEG2) en vue de mesurer une première valeur de la complexité de la trame et d'établir le type d'image de la trame, puis à estimer une seconde valeur de la complexité de la trame en utilisant la première valeur mesurée comme paramètre. La trame est ensuite codée avec un second algorithme distinct (H.264) utilisant la seconde valeur de la complexité de la trame et le type d'image de la première trame comme paramètres.

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