appcoef - One Dimension Approximation Coefficent Reconstruction

Calling Sequence

A=appcoef(c,l,wname,[N])

A=appcoef(c,l,Lo_R,Hi_R,[N])

Parameters

• wname : wavelet name
• A : reconstructed approximation coefficient
• Lo_R : lowpass synthesis filter
• Hi_R : highpass syntheis filter
• c : coefficent array
• l : length array
• N : restruction level

Description

appcoef is for extraction or reconstruction of approximation coeffient at different level after a multiple level decompostion. Extension mode is stored as a global variable and could be changed with dwtmode. If N is omitted, maximum level approximation will be obtained.

Examples

  x=rand(1,100);
  [C,L]=wavedec(x,3,'db2');
  A2=appcoef(c,l,'db2',2);
 

Author

Roger Liu and Isaac Zhi

See Also

wavedec ,   waverec ,   detcoef ,