WFILTDT_QSHIFT Improved Orthogonality and Symmetry properties Usage: [h,g,a] = wfiltdt_qshift(N); [h,g,a]=WFILTDT_QSHIFT(N) with N in {1,2,3,4,5,6,7} returns Kingsbury's Q-shift filters suitable for dual-tree complex wavelet transform. Filters in both trees are orthogonal and based on a single prototype low-pass filter with a quarter sample delay. Other filters are derived by modulation and time reversal such that they fulfil the half-sample delay difference between the trees. Examples: --------- : wfiltdtinfo('qshift3'); References: N. G. Kingsbury. A dual-tree complex wavelet transform with improved orthogonality and symmetry properties. In ICIP, pages 375--378, 2000. N. Kingsbury. Design of q-shift complex wavelets for image processing using frequency domain energy minimization. In Image Processing, 2003. ICIP 2003. Proceedings. 2003 International Conference on, volume 1, pages I--1013--16 vol.1, Sept 2003.
Url: http://ltfat.github.io/doc/wavelets/wfiltdt_qshift.html
Package: ltfat