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Adaptive directional wavelet transform is an effective alternative of the traditional 2-D wavelet transform for image coding. It is able to transform an image adaptively along diagonal orientations as well as conventional vertical/horizontal directions. However, it requires to transmit transform direction information to the decoder side. For image coding at very low bitrates, the bit budget of the...
This paper proposes an efficient approach for adaptive directional wavelet transform (WT) based on directional prefiltering. Although the adaptive directional WT is able to transform an image along diagonal orientations as well as traditional horizontal and vertical directions, it sacrifices computation speed for good image coding performance. We present two efficient methods to find the best transform...
In this paper, we present an application of adaptive directional wavelet transform (WT) for content-based texture image retrieval. The adaptive directional WT is an alternative of the traditional separable WT for image coding since it is able to transform along diagonal orientations as well as horizontal/vertical orientations and keeps perfect reconstruction property by lifting factorization. We use...
This paper proposes a computationally efficient approach of adaptive directional wavelet transform (AD WT). The AD WT is based on lifting implementation of WT, and it is able to transform an image along diagonal orientations as well as traditional horizontal and vertical directions. The AD WT sacrifices computational speed for its good image coding performance. We present an alternative method to...
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...
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