Function: wfiltdt_qshift
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