Directional filtering transform

  • Authors:

  • Xiulian Peng;Feng Wu;Jizheng Xu

  • Affiliations:

  • University of Science and Technology of China, HeFei, China;Microsoft Research Asia, Beijing, China;Microsoft Research Asia, Beijing, China and Institute of Image Communication and Information Processing, Department of Electronic Engineering and Shanghai Key Laboratory of Digital Media Processin ...

  • Venue:
  • ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
  • Year:
  • 2009

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Abstract

This paper proposes the directional filtering transform (dFT, in order to distinguish from the common usage on DFT) to better exploit intra-frame correlation in H.264 intra-frame coding. It consists of a directional filtering and an optional DCT transform. In the proposed directional filtering, there are two different approaches. One is the uni-directional filtering (UDF) that is similar to H.264 directional intra prediction. In this approach, only samples from neighboring blocks can be used in prediction. Another is bi-directional filtering (BDF) that exploits the correlations among samples from not only neighboring blocks but also the current block. The prediction structure in this approach is hierarchical multi-layer. In this paper, we present mathematical analyses on UDF and BDF and show the advantage to combine them together. The proposed dFT is integrated into H.264 intra-frame coding too. The preliminary experimental results in H.264 demonstrate its superiority.