Intra Prediction by a linear combination of Template Matching predictors

Laurent Guillo 1 Tangi Poirier 1 Christine Guillemot 1
1 TEMICS - Digital image processing, modeling and communication
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
Abstract : In intra mode, a prediction block is formed by extrapolating pixels neighbouring the current block to be coded. It is then subtracted from the current block prior encoding the resulting residual. When blocks have regular textures, this method is efficient. However, predicting blocks with more complex textures in this way is less adapted. This contribution presents an intra prediction technique using template matching enhanced by a weighting factor computed by a one step matching pursuit approach. This method can be seen as a generalization of the template matching method in which the weighting factor is not "1". It is also more general in the sense that it can lead to a linear combination of blocks which will best approximate the template, hence the block to be predicted. This only tool has been integrated in KTA2.7 and compared with the original KTA2.7. Classes and videos used are those selected by the Intra AhG. All pictures were encoded as Intra. Improvements related to videos belonging to the classes A, B1 and D are scarcely significant. However, average gains for videos belonging to the classes C, E and B2 are respectively (+0.17dB, -2.56%), (+0.19dB, -3.33%) and (+0.17dB, -3.79%).
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Soumis le : mercredi 11 mai 2011 - 14:28:55
Dernière modification le : mercredi 21 février 2018 - 01:51:52
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  • HAL Id : inria-00592149, version 1



Laurent Guillo, Tangi Poirier, Christine Guillemot. Intra Prediction by a linear combination of Template Matching predictors. [Technical Report] 2010. 〈inria-00592149〉



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