Wavelet Toolbox™

Maximum wavelet decomposition level

Syntax

• L = wmaxlev(S,'wname') 
  

Description

wmaxlev is a one- or two-dimensional wavelet or wavelet packets oriented function.

wmaxlev can help you avoid unreasonable maximum level values. L = wmaxlev(S,'wname') returns the maximum level decomposition of signal or image of size S using the wavelet named in the string 'wname' (see wfilters for more information).

wmaxlev gives the maximum allowed level decomposition, but in general, a smaller value is taken.

Usual values are 5 for the one-dimensional case, and 3 for the two-dimensional case.

Examples

• % For a 1-D signal. 
  s = 2^10; 
  w = 'db1';
  
  % Compute maximum level decomposition. 
  % The rule is the last level for which at least 
  % one coefficient is correct. 
  l = wmaxlev(s,w)
  
  l =
      10
  
  % Change wavelet. 
  w = 'db7';
  
  % Compute maximum level decomposition. 
  l = wmaxlev(s,w)
  
  l =
      6
  
  % For a 2-D signal. 
  s = [2^9 2^7]; 
  w = 'db1';
  
  % Compute maximum level decomposition. 
  l = wmaxlev(s,w)
  
  l =
      7
  
  % which is the same as: 
  l = wmaxlev(min(s),w)
  
  l =
      7
  
  % Change wavelet. 
  w = 'db7';
  
  % Compute maximum level decomposition. 
  l = wmaxlev(s,w)
  
  l =
      3
  

See Also
wavedec, wavedec2, wpdec, wpdec2

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