Prediction and coding of bi-directionally predicted video...

Details Prediction and coding of bi-directionally predicted video... Prediction and coding of bi-directionally predicted video...

H - Electricity

04

N

H04N 7/50 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/34 (2006.01) H04N 7/36 (2006.01) H04N 7/46 (2006.01)

Patent

CA 2230562

A system for coding of digital video images such as bi-directionally predicted video object planes (B-VOPs) (420), in particular, where the B-VOP and/or a reference image .(400,440) used to code the B-VOP is interlaced coded. For a B-VOP macroblock (420) which is co-sited with a field predicted macroblock of a future anchor picture (440), direct mode prediction is made by calculating four field motion vectors (MV f,toP, MV f,bot, MV b,top, MV b,bot) , then generating the prediction macroblock. The four field motion vectors and their reference fields are determined from (1) an offset term (MV D) of the current macroblock' s coding vector, (2) the two future anchor picture field motion vectors (MV top, MV bot), (3) the reference field (405,410) used by the two field motion vectors of the co-sited future anchor macroblock, and (4) the temporal spacing (TR b,top, TR b,bot, TR D,top. TR D,bot), in field periods, between the current B-VOP fields and the anchor fields. Additionally, a coding mode decision process for the current MB selects a forward, backward, or average field coding mode according to a minimum sum of absolute differences (SAD) error which is obtained over the top (430) and bottom (425) fields of the current MB (420).

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