First pass encoding of i and p-frame complexity for...

H - Electricity – 04 – N

Patent

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H04N 7/26 (2006.01) H04N 7/36 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2457614

The invention relates to an improved system and method for encoding digital images within frames for digital television transmission. Every anchor frame in a first pass encoder is encoded as a P-frame. Groups of macroblocks, such as slices in the P-frame, are alternately encoded as I-slices and P-slices. This allows both I and P encoding complexity to be computed in a single pass, without having to encode the same frame twice. Accordingly, the I-frame decision can be made at a second pass encoder instead of at the first pass encoder, thus taking advantage of a look-ahead pipeline architecture to more effectively align the I-frames with scene changes.

L'invention a trait à un système et à un procédé améliorés de codage d'images numériques dans des trames, en vue d'une transmission télévisuelle numérique. Chaque trame d'ancrage se trouvant dans un premier codeur de passage est codée sous forme de trame P. Des groupes de macroblocs, tels que des tranches situées dans la trame P, sont codées de façon alternée, sous forme de tranches I et de tranches P. Cette fonction permet de calculer la complexité de codage tant de I que de P en un passage unique, sans nécessiter le double codage d'une même trame. De cette manière, la décision concernant la trame I peut être prise au niveau d'un second codeur de passage, et non au niveau du premier codeur de passage, ce qui permet de tirer parti d'une architecture pipeline à anticipation, afin d'aligner plus efficacement les trames I avec les changements de scènes.

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