Direction-Adaptive Lifting Wavelet Transform for Image Coding
WANG Xiang-Hai1,2, XIA Chun-Yu1, SONG Chuan-Ming1
1.School of Computer and Information Technology, Liaoning Normal University, Dalian 116081 2.Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education, Xiangtan University, Xiangtan 411105
Abstract A direction-adaptive lifting wavelet transform (DA-LWT) based on block of image is proposed in this paper. The fixed size of directional block is used for each level of transform. Directional information is retained by the first and second level transform. The direction of higher level transform is obtained by the prediction of the first two levels, and the cost of side information is reduced. According to the minimum prediction residual energy, the filtering direction of filter is selected adaptively to eliminate the redundancy between neighboring pixels effectively and reduce the energy of high-frequency coefficients. Adopting the interpolation based on fractional pixel, and the direction resolution is improved. Experimental results show that the transform coefficients of image obtained by DA-LWT have a better "zero-tree" feature. DA-LWT can obtain better coding efficiency and visual effects compared with traditional lifting wavelet transform.
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2015, Vol. 28 
