Name
appcoef2 — Two Dimension Approximation Coefficent Reconstruction
Calling Sequence
A=appcoef(c,s,wname,[N])
A=appcoef(c,s,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
- s
-
: size array
- N
-
: restruction level
Description
appcoef2 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(100,100);
[C,S]=wavedec(x,3,'db2');
A2=appcoef(C,S,'db2',2);
Authors
Roger Liu and Isaac Zhi