Wavelet Toolbox™

Transform quadruplet of filters to lifting scheme

Syntax

• LS = filt2ls(LoD,HiD,LoR,HiR)
  

Description

LS = filt2lsv(LoD,HiD,LoR,HiR) returns the lifting scheme LS associated with the four input filters LoD, HiD, LoR, and HiR that verify the perfect reconstruction condition.

Examples

• [LoD,HiD,LoR,HiR] = wfilters('db2')
  
  LoD =
  
     -0.1294    0.2241    0.8365    0.4830
  
  HiD =
  
     -0.4830    0.8365   -0.2241   -0.1294
  
  LoR =
  
      0.4830    0.8365    0.2241   -0.1294
  
  HiR =
  
     -0.1294   -0.2241    0.8365   -0.4830
  
  LS = filt2ls(LoD,HiD,LoR,HiR);
  displs(LS);
  
  LS = {...                                         
  'd'             [ -1.73205081]              [0]   
  'p'             [ -0.06698730  0.43301270]  [1]   
  'd'             [  1.00000000]              [-1]  
  [  1.93185165]  [  0.51763809]              []    
  };                                                
  
  LSref = liftwave('db2');
  displs(LSref);
  
  LSref = {...                                         
  'd'             [ -1.73205081]              [0]   
  'p'             [ -0.06698730  0.43301270]  [1]   
  'd'             [  1.00000000]              [-1]  
  [  1.93185165]  [  0.51763809]              []    
  };                                                
  

See Also
ls2filt, lsinfo

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