IEEE Trans Image Process - Direct intermode selection for H.264 video coding using phase correlation.

Tópicos

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{ algorithm(1844) comput(1787) effici(935) }
{ high(1669) rate(1365) level(1280) }
{ motion(1329) object(1292) video(1091) }
{ cost(1906) reduc(1198) effect(832) }
{ method(984) reconstruct(947) comput(926) }
{ estim(2440) model(1874) function(577) }
{ featur(3375) classif(2383) classifi(1994) }
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{ imag(1057) registr(996) error(939) }
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{ method(2212) result(1239) propos(1039) }

Resumo

The H.264 video coding standard exhibits higher performance compared to the other existing standards such as H.263, MPEG-X. This improved performance is achieved mainly due to the multiple-mode motion estimation and compensation. Recent research tried to reduce the computational time using the predictive motion estimation, early zero motion vector detection, fast motion estimation, and fast mode decision, etc. These approaches reduce the computational time substantially, at the expense of degrading image quality and/or increase bitrates to a certain extent. In this paper, we use phase correlation to capture the motion information between the current and reference blocks and then devise an algorithm for direct motion estimation mode prediction, without excessive motion estimation. A bigger amount of computational time is reduced by the direct mode decision and exploitation of available motion vector information from phase correlation. The experimental results show that the proposed scheme outperforms the existing relevant fast algorithms, in terms of both operating efficiency and video coding quality. To be more specific, 82 ~92% of encoding time is saved compared to the exhaustive mode selection (against 58 ~74% in the relevant state-of-the-art), and this is achieved without jeopardizing image quality (in fact, there is some improvement over the exhaustive mode selection at mid to high bit rates) and for a wide range of videos and bitrates (another advantages over the relevant state-of-the-art).

Resumo Limpo

h video code standard exhibit higher perform compar exist standard h mpegx improv perform achiev main due multiplemod motion estim compens recent research tri reduc comput time use predict motion estim earli zero motion vector detect fast motion estim fast mode decis etc approach reduc comput time substanti expens degrad imag qualiti andor increas bitrat certain extent paper use phase correl captur motion inform current refer block devis algorithm direct motion estim mode predict without excess motion estim bigger amount comput time reduc direct mode decis exploit avail motion vector inform phase correl experiment result show propos scheme outperform exist relev fast algorithm term oper effici video code qualiti specif encod time save compar exhaust mode select relev stateoftheart achiev without jeopard imag qualiti fact improv exhaust mode select mid high bit rate wide rang video bitrat anoth advantag relev stateoftheart

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