Highpass-filtering based adaptive directional wavelet transform

Authors:
Yuichi Tanaka;Madoka Hasegawa;Shigeo Kato
Affiliations:
Department of Information Science, Utsunomiya University, Utsunomiya, Tochigi, Japan;Department of Information Science, Utsunomiya University, Utsunomiya, Tochigi, Japan;Department of Information Science, Utsunomiya University, Utsunomiya, Tochigi, Japan
Venue:
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Year:
2009

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Abstract

In this paper, a calculation method of transform directions for adaptive directional wavelet transform (AD WT) is proposed. It uses 2-D highpass filters as a preprocessing of the conventional calculation stage. The filters can reduce the number of direction candidates effectively. In image coding, our proposed framework shows very comparable results to the conventional AD WT and outperforms the traditional separable WT.