A New Method of Direct Mode Motion Compensation in Multiple Picture Prediction

Satoshi KONDO  Shinya KADONO  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D   No.9   pp.2212-2220
Publication Date: 2004/09/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Image Processing and Video Processing
B-picture,  multiple picture prediction,  direct mode,  H.26L,  

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We propose a new method of direct mode motion compensation for bi-directionally predicted pictures (B-pictures). The proposed direct mode system is utilized in extended multiple picture prediction, in which blocks in B-pictures are encoded by referring to previous B-pictures in addition to I- or P-pictures as forward reference pictures in a multiple picture prediction framework. The proposed direct mode is suitable for extended multiple picture prediction, since it always uses the immediately previous picture as the forward reference picture. In the simulation, our proposed method is implemented in the H.26L codec. The simulation results show that the extended multiple picture prediction employing the proposed direct mode can reduce the bit rate of B-pictures by up to nearly 13% compared to conventional multiple picture prediction under typical encoding conditions. We also evaluate the performance of the proposed direct mode with the extended multiple picture prediction under several different encoding conditions.