Highpass-filtering based adaptive directional wavelet transform
Yuichi Tanaka, Madoka Hasegawa, Shigeo Kato · 2009
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.